Warrant Issued under TARP [Member] TARP warrant Represents the warrant issued to U.S. Department of the Treasury under the Troubled Asset Relief Program (TARP). Available-for-sale Securities Investment [Text Block] The unused portion of a construction loan that is available to the borrower to withdrawn upon. Unused Portions of Construction Loans [Member] Unadvanced portions of construction loans Preferred Stock [Table] Preferred Stock. Exercise Price of Warrants TARP Warrant exercisable price Exercise Price Of Warrants. Preferred Stock Redemption Price Percentage of Issue Price Series A preferred stock redemption price, percentage of issue price Preferred Stock Redemption Price Percentage of Issue Price. Available for Sale Securities Specified Percentage by Which Book Value Exceeds Stockholders Equity Excluding US Government and Federal Agencies Securities Specified percentage by which book value exceeds stockholder's equity of securities of any single issuer other than U. S. Government and federal agencies securities Represents the specified percentage by which book value exceeds stockholder's equity for securities categorized neither as held-to-maturity nor trading securities other than securities issued by U. S. Government and federal agencies. Award Type [Axis] Warrants Converted to Purchase of Common Stock Warrants Converted To Purchase Of Common Stock Number of shares to be purchased by common stock warrant Cumulative Preferred Stock Issued Cumulative Preferred Stock Issued. Number of cumulative perpetual preferred stock shares issued Available for Sale Securities Excluding US Government and Federal Agencies Securities Book Value Exceeding Specified Percentage of Stockholders Equity Held Number Securities of any single issuer held whose book value exceeds specified percentage of stockholder's equity other than U. S. Government and federal agencies securities (in shares) Represents the number of securities held categorized neither as held-to-maturity nor trading securities whose book value exceeds a specified percentage of stockholder's equity, excludes securities issued by U. S. Government and federal agencies. Preferred Stock [Line Items] Preferred Stock Preferred Stock Amendment Description Loan, Acquisition and Collection Expense Loan acquisition and collection expense Represents the amount of expenses incurred during the period for the amount of loan acquisition and collection expense. Amendment Flag Line of Credit Facility Term Term of outstanding letters of credit Represents the term of the credit facility arrangement made by the entity. Threshold Period Past Due for Write-off of Financing Receivable Threshold period past due for financing receivable to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Maximum charge-off period Threshold Period Past Due for Write-off of Financing Receivable Number of Transactions in which Customer Lists and Fixed Assets Sold Number of separate transactions in which customer list and certain fixed assets sold Represents the number of separate transactions in which customer list and certain fixed assets sold by the entity. Number of separate transactions in which substantially all assets sold Long Term Debt Loan to Value Ratio Maximum Loan-to-value ratio This element represents the maximum ratio of mortgage amount divided by the value of the property that the Company will accept for a loan that will be originated. Commitments to Lend [Table Text Block] Tabular disclosure of the commitment to originate loans and extend credit under unused credit lines. Financial Instruments with Contract Amounts Represent Credit Risk Schedule of Disposal Groups, Including Discontinued Operations Income Statement [Table Text Block] Summary of operations of NBIG Tabular disclosure of disposal groups operations. Troubled Debt Restructuring Payment Default Number of Days Number of days a TDR payment is in default Represents the number of days payments are past due before a TDR is consider to be in default. Represents the amount of loan and leases classified by the internal credit quality grade which are included in comprehensive analysis. Loans and Leases Receivable Risk Rating Loan by risk rating The cash outflow for redemption of preferred stock and warrants. Payments for Redemption of Preferred Stock and Warrants Redemption of preferred stock and warrants Redemption of Preferred Stock and Warrants Redemption of preferred stock and warrants Represents redemption amount of currently redeemable preferred stock and warrants. Redemption of Preferred Stock and Warrants, Shares Redemption of preferred stock and warrants (in shares) Represents the number of redeemable preferred stock and warrants. Type of Modification [Axis] Information related to troubled debt restructurings by type of modification. Type of Modification [Domain] Specific type of modification. Extended Maturity [Member] Extended maturity Represents information pertaining to extended maturity modification by troubled debt restructurings related to financing receivables. Adjusted interest rate Represents information pertaining to adjusted interest rate modification by troubled debt restructurings related to financing receivables. Adjusted Interest Rate [Member] Protective Advance [Member] Protective advance Represents information pertaining to protective advance modification by troubled debt restructurings related to financing receivables. Current Fiscal Year End Date Other Modification [Member] Other Represents information pertaining to other modification by troubled debt restructurings related to financing receivables. Rate and Maturity [Member] Rate and maturity Represents information pertaining to rate and maturity modification by troubled debt restructurings related to financing receivables. Represents information pertaining to the principal deferment modification by troubled debt restructurings related to financing receivables. Principal Deferment [Member] Principal deferment Court ordered concession Represents information pertaining to modification due to court ordered concession by troubled debt restructurings related to financing receivables. Court Ordered Concession [Member] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Accretable Yield Other Changes Other changes Represents the other changes in the aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan for loans not accounted for as debt securities. This relates to loans not accounted for as a debt security, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition that the investor will be unable to collect all contractually required payments receivable. Unrealized Losses, Less than 12 Months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Schedule of amounts recognized in income related to both hedge ineffectiveness and amounts excluded from effectiveness testing Tabular disclosure of amounts recognized in income related to both hedge ineffectiveness and amounts excluded from effectiveness testing. Schedule of Fair Value Hedge Ineffectiveness [Table Text Block] Unpaid principal balance The undiscounted amount of principal on loans with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Unpaid Principal Accretable Yield. Accretable Yield Accretable yield Document Information [Table] Nonaccretable Difference. Nonaccretable Difference Nonaccretable difference Loans Acquired The number of loans acquired during the period. Loans purchased Financing Receivable Recorded Investment 90 Days Past Due and Nonaccrual Past Due 90 Days or More-Nonaccrual Financing Receivable Recorded Investment 90 Days Past Due and Nonaccrual. Document Period End Date Troubled Asset Relief Capital Purchase Program [Text Block] Troubled Asset Relief Capital Purchase Program The entire disclosure of the entity's participation in the Troubled Asset Relief Capital Purchase Program. Troubled Asset Relief Capital Purchase Program Troubled Asset Relief Capital Purchase Program Disclosure [Text Block] The entire disclosure for participation in troubled asset relief capital purchase program. Troubled Asset Relief Capital Purchase Program. Troubled Asset Relief Capital Purchase Program Troubled Asset Relief Capital Purchase Program [Line Items] Troubled Asset Relief Capital Purchase Program Document and Entity Information Voting Common Stock [Member] Voting Common Stock [Member] Voting common stock Voting Common Stock TSM Properties LLC V.s Northeast Bank and Daniel G. Thompson [Member] TSM Properties, LLC v. Northeast Bank and Daniel G. Thompson Represents information pertaining to TSM Properties, LLC vs Northeast Bank and Daniel G. Thompson. Notional amount Derivative, Notional Amount Gain (Loss) on Sale of Loans Held for Sale Gain on sales of loans held for sale The gain (loss) resulting from the sale of loans held for sale. Gain on sales of loans held for sale Entity [Domain] Unrealized Losses, Total Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Gain (Loss) on Sale of Loans Held for Investment Gain on sales of portfolio loans The gain (loss) resulting from the sale of loans held for investment. Gain on sales of portfolio loans Gain (Loss) on Sale of Foreclosed Assets Gain (loss) recognized on real estate owned and other repossessed collateral, net The net gain (loss) resulting from the sale of foreclosed assets. (Gain) loss on sale or impairment of repossessed collateral, net Transfer of Loans to Foreclosed Assets Transfers from loans to real estate owned and other repossessed collateral The value of loans transferred to foreclosed assets in a non-cash transaction. Unrealized Losses, More than 12 Months Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Troubled Debt Restructurings on Financing Receivables by Accrual Status [Table Text Block] Troubled debt restructurings by accrual status Tabular disclosure of financing receivables and troubled debt restructurings classified by accrual or non-accrual status. Schedule of Credit Impaired Loans [Table Text Block] Information related to the unpaid principal balance and carrying amounts of purchased credit impaired loans Tabular disclosure of the unpaid principal balance and carrying amount of purchased credit impaired loans. Schedule of Allowance for Loan Losses by Portfolio Segment and Impairment Methodology [Table Text Block] Allowance for Loan Losses by Portfolio Segment and Impairment Methodology Schedule of Allowance for Loan Losses by Portfolio Segment and Impairment Methodology Table [Text Block] Troubled Debt Restructurings on Financing Receivables Recorded Investment [Table Text Block] Loans modified in a TDR and the change in the recorded investment subsequent to the modifications Tabular disclosure of the recorded investment in financing receivables and troubled debt restructurings. Entity Information [Line Items] Document and Entity Information Loan Portfolio Originated [Member] Loan portfolio originated by the reporting entity. Originated Purchased Loan portfolio acquired in a transfer. Loan Portfolio Purchased [Member] Financing Receivable Modifications Number of Contracts Modified Number of Contracts Number of financing receivables that have been modified by troubled debt restructurings. Financing Receivable Modifications Subsequent Defaulted Number of Contracts Number of loans modified by TDR subsequently defaulted Represents the number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. Recorded Investment Pre-Modification Financing Receivable Modifications Pre Modification Recorded Investments. Financing Receivable Modifications Pre Modification Recorded Investments Financing Receivable Modifications Forgiveness of Principal Forgiveness of principal related to loans modified in a TDR Represents the amount of principal forgiven for financing receivables that have been modified by troubled debt restructurings. Recorded Investment Financing Receivable Modifications Post Modification Recorded Investments Recorded Investment Post-Modification Financing Receivable Modifications Post Modification Recorded Investments. Represents the amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. Financing Receivable Modifications Subsequent Defaulted Recorded Investment Recorded investment of loans modified by TDR subsequently defaulted Available-for-sale Securities, Gross Unrealized Gains Gross Unrealized Gains Consumer Residential Real Estate [Member] Residential and consumer loans Loan or extension of credit for personal, family, or household use including real estate. Financing Receivable Loans Classified as Troubled Debt Restructurings that are Involved in Bankruptcy Collateral dependent impaired loans Loans for which the borrower's obligation was discharged in bankruptcy in a prior period and now considered collateral dependent impaired loans. Loans and Leases Receivable Troubled Debt Restructurings Recorded Investment Accrual Status Accrual This element represents the amount of Troubled Debt Restructurings recorded in accrual status at the reporting date. Loans and Leases Receivable Troubled Debt Restructurings Recorded Investment Nonaccrual Status Nonaccrual This element represents the amount of Troubled Debt Restructurings recorded in nonaccrual status at the reporting date. Troubled Debt Restructurings Subsequent Default Total Loans Total TDRs This element represents the total amount of Troubled Debt Restructurings recorded at the reporting date. Northeast Bancorp 2010 Option and Incentive Plan [Member] 2010 Plan Represents information pertaining to the Northeast Bancorp 2010 Option and Incentive Plan (the 2010 Plan). Represents information pertaining to the Northeast Bancorp Amended and Restated 2010 Stock Option and Incentive Plan (the Restated Plan). Northeast Bancorp Amended and Restated 2010 Option and Incentive Plan [Member] Restated Plan Exercise Price One [Member] $9.38 Represents information pertaining to the first exercise price. Exercise Price Two [Member] $12.63 Represents information pertaining to the second exercise price. Exercise Price Three [Member] $13.93 Represents information pertaining to the third exercise price. Represents information pertaining to the fourth exercise price. Exercise Price Four [Member] $14.52 Exercise Price Five [Member] $12.44 Represents information pertaining to the fifth exercise price. Projected Share Based Compensation Expense Year One 2014 Represents the share-based compensation expense projected for the first fiscal year following the reporting date. Projected Share Based Compensation Expense Year Two 2015 Represents the share-based compensation expense projected for the second fiscal year following the reporting date. Projected Share Based Compensation Expense Year Three 2016 Represents the share-based compensation expense projected for the third fiscal year following the reporting date. Projected Share Based Compensation Expense Year Four 2017 Represents the share-based compensation expense projected for the fourth fiscal year following the reporting date. Projected Share Based Compensation Expense Year Five 2018 Represents the share-based compensation expense projected for the fifth fiscal year following the reporting date. Projected Share Based Compensation Expense Year Total Total This element represents the total projected share-based compensation expense. Disposal Group Including Discontinued Operation Fixed Assets Net of Accumulated Depreciation Fixed assets, net of accumulated depreciation Disposal Group Including Discontinued Operation Fixed Assets Net of Accumulated Depreciation Severance and other direct expenses Disposal Group Including Discontinued Operation Severance and Other Direct Expenses. Disposal Group Including Discontinued Operation Severance and Other Direct Expenses Northeast Bank Insurance [Member] Represents the Northeast Bank Insurance Group, Inc. NGIB Fair Value Assets and Liabilities Measured on Recurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring Basis Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] Fair Value Assets and Liabilities Measured on Nonrecurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Nonrecurring Basis Fair Value of Financial Instruments [Line Items] Fair Value Measurements Stock Issuance Cost Offering costs Represents the cost incurred directly with the issuance of an equity security. Represents the maximum number of shares of all classes of stock permitted to be issued by the reporting entity. Shares Authorized Shares authorized Varney Agency [Member] Represents The Varney Agency, Inc. of Bangor Maine, which acquired the assets of one of the reporting entity's subsidiaries. Varney Agency Disposal Group Severance and Transaction Cost Represents the sum of severance paid to employees of a discontinued operation and other direct expenses, including transactions costs. Severance and other direct expenses Accumulated Other Comprehensive Income (Loss) before Taxes Before tax Accumulated change in equity from transactions and other events and circumstances from non-owner sources, before tax effect. Excludes Net Income or Loss, and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency items, minimum pension liability adjustments, and unrealized gains and losses on certain investments in debt and equity securities as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. Summary of Significant Accounting Policies Accumulated Other Comprehensive Income (Loss) Taxes Tax effect The tax effect of the accumulated change in equity from transactions and other events and circumstances from non-owner sources. Derivative Additional Collateral Requirements Additional collateral requirements Represents the amount of additional collateral required to settle derivative contracts. Entity Well-known Seasoned Issuer Number of derivative agreements terminated prior to maturity Represents the number of derivative contracts terminated prior to maturity. Derivative Number of Contracts Terminated Prior to Maturity Entity Voluntary Filers Represents information pertaining to the Black-Scholes option-pricing model. Black-Scholes option-pricing model Black Scholes Option Pricing Model [Member] Entity Current Reporting Status 12.44 Exercise Price 12.44 [Member] Represents the options with an exercise price of 12.44 dollars per share. Entity Filer Category First Tranche [Member] Represents the first tranche in which shares were vested. First tranche Entity Public Float Hull White Option Pricing Model [Member] Represents information pertaining to the Hull-White option pricing model. Hull-White option pricing model Entity Registrant Name Second Tranche [Member] Represents the second tranche in which shares were vested. Second tranche Entity Central Index Key Stock Options with Market Based Conditions [Member] Contract which gives the holder the right, but not the obligation, to purchase a certain number of shares of stock. These options vest based on the achievement of specified performance goals. Stock options with market-based conditions Third Tranche [Member] Represents the third tranche in which shares were vested. Third tranche Tranche Type [Domain] Information by the tranche under which an employee receives the right to exercise an award. Vesting Period 29 December 2010 To 29 December 2015 [Member] Represents the vesting period under tranche from December 29, 2010 through December 29, 2015. December 29, 2010 through December 29, 2015 Entity Common Stock, Shares Outstanding Represents the vesting period under tranche from December 29, 2010 through December 29, 2016. December 29, 2010 through December 29, 2016 Vesting Period 29 December 2010 To 29 December 2016 [Member] Vesting Period 29 December 2010 To 29 December 2017 [Member] Represents the vesting period under tranche from December 29, 2010 through December 29, 2017. December 29, 2010 through December 29, 2017 Receivable Type [Axis] Vesting Period 29 December 2015 To 29 December 2016 [Member] Represents the vesting period under tranche from December 29, 2015 through December 29, 2016. December 29, 2015 through December 29, 2016 Vesting Period 29 December 2016 To 29 December 2017 [Member] Represents the vesting period under tranche from December 29, 2016 through December 29, 2017. December 29, 2016 through December 29, 2017 Vesting [Domain] Vesting type pertaining to equity-based compensation. Tranche Type [Axis] Identification by the tranche under which an employee receives the right to exercise an award. Vesting [Axis] Information by vesting type pertaining to equity-based compensation. Share Based Compensation Arrangement by Share Based Payment Award, Fair Value Assumptions Weighted Average Fair Value Per Option Weighted average fair value per option (in dollar per share) Represents the weighted average fair value per option under the assumption that is used in valuing an option on its own shares. Represents the incremental weighted average fair value per option under the assumption that is used in valuing an option on its own shares. Share Based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions Incremental Weighted Average Fair Value Per Option Incremental weighted average fair value per option (in dollar per share) Share Based Compensation Arrangement by Share Based Payment Award, Number of Employees to Whom Options Granted Number of executives to whom options were granted Represents the number of employees to whom options were granted under the equity-based compensation plan. Share Based Compensation Arrangement by Share Based Payment Award Number of Tranches Number of tranches in which options were granted Represents the number of tranches in which options were granted under the equity-based compensation plan. Share Based Compensation Arrangement by Share Based Payment Award Options Applicable Hurdle Price Applicable hurdle price (in dollar per share) Represents the applicable hurdle price of the options, that varies depending on the number of years that have elapsed since the date of grant, immediately before the modification. Share Based Compensation Arrangement by Share Based Payment Award Options Amended Hurdle Price Amended hurdle price (in dollar per share) Represents the amended hurdle price of the options after the modification. Vesting Period 29 December 2010 to 28 December 2015 [Member] Represents the vesting period under tranche from December 29, 2010 through December 28, 2015. December 29, 2010 through December 28, 2015 Vesting Period 29 December 2010 to 28 December 2016 [Member] Represents the vesting period under tranche from December 29, 2010 through December 28, 2016. December 29, 2010 through December 28, 2016 Vesting Period 29 December 2010 to 28 December 2017 [Member] Represents the vesting period under tranche from December 29, 2010 through December 28, 2017. December 29, 2010 through December 28, 2017 Vesting Period 29 December 2015 to 28 December 2016 [Member] Represents the vesting period under tranche from December 29, 2015 through December 28, 2016. December 29, 2015 through December 28, 2016 Document Fiscal Year Focus Vesting Period 29 December 2016 to 28 December 2017 [Member] Represents the vesting period under tranche from December 29, 2016 through December 28, 2017. December 29, 2016 through December 28, 2017 Document Fiscal Period Focus Transfers from Premises and Equipment to Repossessed Collateral Transfers from premises and equipment to real estate owned and other repossessed collateral Represents the transfers from premises and equipment to repossessed collateral in noncash transactions. Payments for Regulatory Stock Purchases of regulatory stock The cash outflow for purchases of regulatory stock. Junior Subordinated Debt Securities [Text Block] Junior Subordinated Debentures Issued to Affiliated Trusts This element represent Junior Subordinated Debentures Issued to Affiliated Trusts. Junior Subordinated Debentures Issued to Affiliated Trusts Junior Subordinated Debentures Issued to Affiliated Trusts This element represent Junior Subordinated Debentures Issued to Affiliated Trusts. Investments in Unconsolidated Affiliates Investments in NBN Capital Trust affiliates Represents the amount of investments in unconsolidated affiliates. Summary of Significant Accounting Policies [Table] Information related to various accounting policies of the entity. Summary of Significant Accounting Policies [Line Items] Summary of Significant Accounting Policies Troubled Asset Relief Capital Purchase Program [Table] Schedule reflecting information pertaining to the troubled asset relief capital purchase program. Leasehold and Building Improvements [Member] Leasehold and building improvements Additions or improvements to assets held under a lease arrangement, and addition, improvement, or renovation to a facility held for productive use including, but not limited to, office, production, storage and distribution facilities. Furniture, Fixtures and Equipment [Member] Furniture, fixtures and equipment Equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities, and tangible personal property used to produce goods and services. Summary of Operations [Abstract] Summary of operations Legal Entity [Axis] Schedule of Composition of Deposits [Table Text Block] Schedule of composition of deposits Tabular disclosure of composition of deposits. Document Type Tabular disclosure of scheduled maturities of time certificates by fiscal year. Schedule of Maturities of Time Certificates [Table Text Block] Schedule of maturities of time certificates Time Certificates Less than 100 Time certificates of less than $100 Represents the amount of time certificates that total to less than 100 dollars. Other Time Certificates Other time certificates Represents the amount of other time certificates. Schedule of Finite Lived Intangible Assets Including Goodwill [Table Text Block] Schedule of changes in the carrying amount of intangible assets Tabular disclosure of assets, including goodwill, lacking physical substance with a finite life, by either major class or business segment. Schedule of Finite Lived Intangible Assets Including Goodwill [Table] Schedule of assets, including goodwill, lacking physical substance with a finite life. Finite Lived Intangible Assets Including Goodwill [Line Items] Changes in the carrying amount of intangible assets Amortization of Goodwill Amortization Represents the amount of expense charged against earnings to allocate the cost of goodwill (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from it. Amount of assets, excluding financial assets and goodwill, lacking physical substance with a finite life sold or disposed. Finite Lived Intangible Assets Sold or Disposed Assets sold or disposed The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to non-taxable merger expense under enacted tax laws. Income Tax Reconciliation Non Taxable Merger Expense Non-taxable merger expense Income Tax Reconciliation Non Taxable Bargain Purchase Gain Non-taxable bargain purchase gain The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to non-taxable bargain purchase gain under enacted tax laws. Income Tax Reconciliation Non Taxable Interest Income Non-taxable interest income The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to non-taxable interest income under enacted tax laws. Income Tax Reconciliation Non Taxable BOLI Income Non-taxable BOLI income The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to non-taxable BOLI income under enacted tax laws. The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to low-income housing tax credit under enacted tax laws. Income Tax Reconciliation Low Income Housing Tax Credit Low-income housing tax credit Deferred Tax Assets Loan Basis Differential Loan basis differential Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from loan basis differential. Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from time deposit basis differential. Deferred Tax Assets Time Deposit Basis Differential Time deposit basis differential Deferred Tax Assets Capital Lease Capital lease Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from capital leases. Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from interest on nonperforming loans. Deferred Tax Assets Interest on Nonperforming Loans Interest on nonperforming loans Deferred Tax Assets Limited Partnerships Limited partnerships Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from limited partnerships. Borrowings basis differential Amount of deferred tax liability attributable to taxable temporary differences from borrowings basis differential. Deferred Tax Liabilities Borrowings Basis Differential Deferred Tax Liabilities Unrealized Gains on Available For Sale Securities Unrealized gain on available for sale securities Amount of deferred tax liability attributable to taxable temporary differences from unrealized gains on available-for-sale securities. Income Taxes Additional Disclosures [Abstract] Additional disclosures Amount of provision for potential liability that would result, if 100% of the reserve were recaptured Represents the amount of provision for potential liability that would result, if specified percentage of reserve were recaptured. Amount of Provision for Potential Liability that would Result if Specified Percentage of Reserve Recaptured Uncertain Tax Positions Federal and State Uncertain tax positions related to federal and state income tax matters Represents the amount of uncertain tax positions related to federal and state income tax matters as of the date. Reserve for Loan Losses Reserve for loan losses Represents the amount of reserves for loan losses as of date. Percentage of Amount Actually used for Purposes other than to Absorb Losses Subject to Taxation in Year in which Used Percentage of amount actually used for purposes other than to absorb losses subject to taxation in the year in which used Represents the percentage of amount actually used subject to taxation in the year in which it was used for purposes other than to absorb the losses for which it was established. Defined Contribution Plan Employee Contribution as Percentage of Base Compensation Maximum Maximum employees contribution as a percentage of their base compensation Represents the maximum employee contributions to the plan as a percentage of their base compensation. Defined Contribution Plan, Employer Matching Contribution, Percent of Match Employer match of employee contributions of first 6% of base compensation (as a percent) Percentage employer matches of the employee's percentage contribution matched. Defined Contribution Plan Employer Matching Contribution Percent of Match Represents the employee contributions (percentage of compensation) which are matched by the employer. Defined Contribution Plan Employer Match Employee Contribution Percentage of base compensation, matched 50% by employer Percentage of Reserve for Loan Losses Recaptured Percentage of reserves recaptured Represents the percentage of reserve for loan losses recaptured. Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable Represents the eligible age for all participants under the defined contribution plan. Defined Contribution Plan Eligible Age for Participants under Plan Eligible age for full-time salaried and hourly-paid employees under 401(k) plan Defined Contribution Plan Period of Service for Participants under Plan Completed employment required for full-time salaried and hourly-paid employees under 401(k) plan Represents the period of service required for all participants under the defined contribution plan. Lessee Leasing Arrangements, Operating Leases, Term of Contract Lease term Term of the lessee's leasing arrangement, in PnYnMnDTnHnMnS format, for example, P1Y5M13D represents the reported fact of one year, five months, and thirteen days. Lessee Leasing Arrangements, Operating Leases, Term of Contract Deferred Compensation Arrangement with Individual Number of Senior Officers Number of senior officers Represents the number of senior officers under the deferred compensation arrangement with entity. Allowance for Possible Losses on Commitments and Unfunded Loans Allowance for possible losses on commitments and unfunded loans Represents the amount of allowance for possible losses on commitments and unfunded loans as of date. Operating Leases Additional Disclosures [Abstract] Additional disclosures Area of office space in Boston, Massachusetts (in square feet) Represents the area of office space under operating leases arrangements. Operating Leases Area of Office Space Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Disclosure of information about condensed balance sheet, including, but not limited to, balance sheets of consolidated entities and consolidation eliminations. Condensed Income Statement [Table] Condensed Income Statement [Table] Disclosure of information about condensed income statement including, but not limited to, income statements of consolidated entities and consolidation eliminations. Condensed Cash Flow Statement [Table] Disclosure of information about condensed cash flow statement, including, but not limited to, cash flow statements of consolidated entities and consolidation eliminations. Condensed Cash Flow Statement [Table] Condensed Balance Sheet Statements Captions [Line Items] Balance Sheets Condensed Income Statements Captions [Line Items] Statements of Income Represents the amount of dividends earned from banking subsidiary during the period. Dividends from Banking Subsidiary Dividends from banking subsidiary Statements of Cash Flow Condensed Cash Flow Statements Captions [Line Items] Unpaid principal balance of FHLB advances, subject to call provisions Unpaid principal balance of the Federal Home Loan Bank (FHLB) advances, subject to call provisions. Federal Home Loan Bank Advances Unpaid Principal Balance Subject to Call Provisions Maturities within One Year [Member] Maturities in year one Period of maturity for a group of securities or other assets sold under repurchase agreements which mature within twelve months from the reporting date. Maturities in Year Two [Member] Maturities in year two Period of maturity for a group of securities or other assets sold under repurchase agreements which mature in second year from the reporting date. Maturities in Year Three [Member] Maturities in year three Period of maturity for a group of securities or other assets sold under repurchase agreements which mature in third year from the reporting date. Maturities in Year Four [Member] Maturities in year four Period of maturity for a group of securities or other assets sold under repurchase agreements which mature in fourth year from the reporting date. Securities Sold under Agreements to Repurchase Unpaid Principal Balance Unpaid Principal Balance The unpaid principal balance as of the balance sheet date of securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo. Purchased Interest Rate Cap Period for Payment after Reset Date Period after the reset date for payment of purchased interest rate cap Represents the period from the reset date during which payment of purchased interest rate cap is to be made. Capital Leases Term Term of capital leases Represents the term of capital leases. Amortization of securities, net Accretion (Amortization) of Discounts and Premiums, Investments Capital Leases Present Value of Payments as Percentage of Fair Value of Property Present value of the lease payments as a percentage of the fair value of the property Represents the present value of the capital lease payments over a specified period as a percentage of the fair value of the property. Other Borrowings [Abstract] Other Borrowings Accretion of fair value adjustments, net Accretion Expense Tier One Risk Based Capital to Risk Weighted Assets [Abstract] Tier 1 capital to risk weighted assets Tier One Leverage Capital to Average Assets [Abstract] Tier 1 capital to average assets Compliance with Regulatory Capital Requirements Under Banking Regulations Additional Disclosures [Abstract] Additional disclosures Discontinued Operation Income (Loss) from Discontinued Operation Including, Gain (Loss) on Disposal During Phase Out Period Before Income Tax Income from discontinued operations before income tax expense Pretax income (loss) from operations of a business component during the reporting period, until its disposal. Trust Preferred Securities [Member] Trust preferred securities Represents information pertaining to the trust preferred securities. Deposits Income (Loss) from Continuing Operations Available to Common Stockholders Net income from continuing operations available to common shareholders Net income from continuing operations after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). NBN Capital Trust II [Member] NBN Capital Trust II Represents information pertaining to NBN Capital Trust II, a Delaware statutory trust. NBN Capital Trust III [Member] NBN Capital Trust III Represents information pertaining to NBN Capital Trust III, a Delaware statutory trust. NBN Capital Trust IV [Member] NBN Capital Trust IV Represents information pertaining to NBN Capital Trust IV, a Delaware statutory trust. Common Securities of Trust Common securities of trust Represents the amount of common securities of trust. Trust Preferred Securities Principal Balance Unpaid Principal Balance of Private Trust Securities issued Represents the principal balance of trust preferred securities issued. Trust Preferred Securities Interest Rate Contractual Rate of Private Trust Securities issued (as a percent) Represents the interest rate of trust preferred securities issued. Debt Instrument Percentage Increase in Variable Rate Basis for Recognition of Higher Interest Expense Percentage increase in three-month LIBOR for recognition of higher interest expense Represents the increase in variable rate basis for recognition of higher interest expense of the debt instrument. Number of Private Placement Offerings in Which Securities are Sold Number of private placement offerings in which securities are sold Represents the number of private placement offerings in which securities are sold. Trust Preferred Securities Liquidation Amount Liquidation amount per Preferred Security Represents the per share liquidation amount of the trust preferred securities. Federal Home Loan Bank and Federal Reserve Bank Stock [Policy Text Block] Federal Home Loan Bank and Federal Reserve Bank Stock Disclosure of accounting policy for federal home loan bank and federal reserve bank stock. Loans Held for Sale and Loan Servicing [Policy Text Block] Loans Held for Sale and Loan Servicing Disclosure of accounting policy for loans held for sale and loan servicing. Loans [Policy Text Block ] Loans Disclosure of accounting policy for loans. Bank Owned Life Insurance [Policy Text Block] Bank Owned Life Insurance Disclosure of accounting policy for bank owned life insurance. Amortization of Intangible Assets, Continuing Operations The aggregate expense charged against earnings from continuing operations to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. Intangible asset amortization Federal Home Loan Bank of Boston [Member] Reflects the amount of and pertinent information about advances received from and due to the Federal Home Loan Bank, Boston, as of the balance sheet date. Advances from FHLB Boston Line of Credit Federal Home Loan Bank of Boston [Member] Represents details about the line of credit from the Federal Home Loan Bank of Boston. Line of credit FHLB Boston Carrying Amount FHLB Advances [Member] Represents the carrying amount of advances from the Federal Home Loan bank. Carrying amount of FHLB advances NBN Capital Trust II Debenture Maturing March 30 2034 [Member] Represents details concerning the NBN Capital Trust II Debenture that matures on March 30, 2034. NBN Capital Trust II Debenture maturing March 30, 2034 NBN Capital Trust III Debenture Maturing March 30 2034 [Member] Represents details concerning the NBN Capital Trust III Debenture that matures on March 30, 2034. NBN Capital Trust III Debenture maturing March 30, 2034 NBN Capital Trust IV Debenture Maturing February 23 2035 [Member] NBN Capital Trust IV Debenture maturing February 23, 2035 Federal Home Loan Bank Advances Maturities Summary Due from Five to Six Years of Balance Sheet Date Amount of Federal Home Loan Bank advances maturing in the sixth fiscal year following the latest fiscal year. 2018 Loan Portfolio Serviced for Others Loans serviced for others Represents the amount of loans serviced for others. Share Based Compensation Arrangement, by Share Based Payment Award, Options Nonvested, Number of Shares Roll Forward Shares Share Based Compensation Arrangement by Share Based Payment Award, Options Nonvested Weighted Average Grant Date Fair Value [Abstract] Weighted Average Grant Date Fair Value Share Based Compensation Arrangement by Share Based Payment Award Options Exercisable Weighted Average Grant Date Fair Value Exercisable, beginning of year (in dollars per share) Represents the weighted average grant date fair value of options exercisable as calculated by applying the disclosed option pricing methodology. Exercisable, end of year (in dollars per share) Share Based Compensation Arrangement by Share Based Payment Award, Options Vested Weighted Average Grant Date Fair Value Vested (in dollars per share) Represents the weighted average grant date fair value of options vested. Share Based Compensation Arrangement by Share Based Payment Award, Options Forfeited and Expired Weighted Average Grant Date Fair Value Forfeited or expired (in dollars per share) Represents the weighted average grant date fair value of options forfeited or expired as calculated by applying the disclosed option pricing methodology. Represents the number of options vested. Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares Fair Value Asset and Liability Transfer Amount between Fair Value Measurement Levels Transfers of assets and liabilities measured at fair value on a recurring or nonrecurring basis Amount of transfers of assets and liabilities between the fair value measurement levels. Purchased Loans as Percentage of Aggregate Loans Purchased loans as a percentage of total loans Represents the purchased loans expressed as a percentage of total loans. Percentage of Loans Funded with Core Deposits Percentage of loans funded with core deposits Represents the percentage of loans funded with core deposits which is defined as non-maturity deposits and non-brokered insured time deposits. Commercial Real Estate Loans Held as Percentage of Risk Based Capital Commercial real estate held as a percentage of total risk-based capital Represents the commercial real estate loans including owner-occupied commercial real estate loans held, expressed as a percentage of total risk-based capital. Deferred Income Tax Expense (Benefit) Continuing Discontinued Operations Deferred income tax (benefit) provision The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing and discontinued operations. Total deferred (benefit) provision Unrealized (loss) gain on available-for-sale securities Accumulated Net Unrealized Investment Gain (Loss) [Member] Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Other Comprehensive Income (Loss) Unrealized loss on cash flow hedges Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] Accumulated other comprehensive (loss) income components Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive (loss) income Net-of tax amount Additional Paid in Capital Additional paid-in capital Additional Paid-in Capital [Member] Additional Paid-in Capital Amortization Amortization Adjustments to Additional Paid in Capital, Other Accretion of preferred stock Adjustments to reconcile net income to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash (used in) provided by operating activities: Stock offering costs Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock-based compensation Investment in common securities of affiliated trusts Advances to Affiliate Total Advances from Federal Home Loan Banks Federal Home Loan Bank Advances from Federal Home Loan Banks [Abstract] Advertising Expense Advertising Cost, Policy, Expensed Advertising Cost [Policy Text Block] Stock-based compensation expense Allocated Share-based Compensation Expense Recoveries Allowance for Loan and Lease Losses, Recoveries of Bad Debts Allowance for Loan Losses by Portfolio Segment Allowance for Credit Losses on Financing Receivables [Table Text Block] Charge-offs Allowance for Loan and Lease Losses, Write-offs Provision Allowance for Loan and Lease Losses, Provision for Loss, Gross Allowance for loan losses: Allowance for Loan and Lease Losses, Provision for Loss, Net [Abstract] Amortization of Intangible Assets Intangible asset amortization Amortization of intangible assets Amortization Amortization of fair value adjustment for borrowings Amortization of Debt Discount (Premium) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Anti-dilutive securities Earnings Per Share Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities, Name [Domain] Antidilutive Securities [Axis] Securities or Other Assets Sold under Agreements to Repurchase, Maturity Periods [Axis] Assets [Abstract] Assets Financial assets: Assets: Assets recorded under capital lease Assets Held under Capital Leases [Member] Assets Total assets Assets Sold under Agreements to Repurchase, Maturity Period [Domain] Fair Value, Less than 12 Months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Total securities available for sale, Fair Value Available-for-sale Securities, Fair Value Disclosure Available-for-sale securities, Fair Value Available-for-sale securities Due after one year through five years, Fair Value Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value Due within one year, Fair Value Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Available-for-sale Securities. Available-for-sale securities, at fair value Due after ten years, Amortized Cost Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis Fair Value, More than 12 Months Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Due within one year, Amortized Cost Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis Due after five years through ten years, Amortized Cost Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis Due after five years through ten years, Fair Value Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value Securities Available-for-Sale at Amortized Cost and Approximate Fair Values Available-for-sale Securities [Table Text Block] Fair Value, Total Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Available-for-sale Securities, Gross Unrealized Losses Gross Unrealized Losses Investment securities at fair value pledged as collateral for wholesale repurchase agreements and FHLB advances Available-for-sale Securities Pledged as Collateral Due after ten years, Fair Value Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value Due after one year through five years, Amortized Cost Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis Total securities available for sale, Amortized Cost Available-for-sale Securities, Amortized Cost Basis Available-for-sale securities, Amortized Cost Available-for-sale Securities, Gross Realized Gain (Loss) Net securities gains Net gain on sale of available-for-sale securities Net security gains Net gain on available-for-sale securities Gross realized losses Available-for-sale Securities, Gross Realized Losses Gross realized gains Available-for-sale Securities, Gross Realized Gains Balance Sheet Location [Axis] Balance Sheet Location [Domain] Bank Owned Life Insurance Bank owned life insurance Bank Owned Life Insurance Income Bank-owned life insurance income Bank-owned life insurance income, net Capital and Regulatory Matters Basis of Accounting [Text Block] Basis of Presentation Borrowings [Member] Borrowings Buildings Building [Member] Business Combination Accounting Business Combinations Policy [Policy Text Block] Bargain purchase gain Business Combination, Bargain Purchase, Gain Recognized, Amount Bargain purchase gain Capital Leases, Future Minimum Payments Due in Two Years 2015 Capital Leases, Future Minimum Payments Due in Five Years 2018 Capital Lease Obligations [Abstract] Capital lease obligation Capital Leases, Future Minimum Payments Due Total Capital Lease Obligations Capital lease obligation Capital lease obligation Capital [Abstract] Total capital to risk weighted assets Capital Leases, Future Minimum Payments Due in Three Years 2016 Capital Leases, Future Minimum Payments Due, Next Twelve Months 2014 Capital Leases, Future Minimum Payments Due Thereafter 2019 and thereafter Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Minimum lease payments over the remaining term of the lease and the outstanding capital lease obligation Capital Leases, Future Minimum Payments Due in Four Years 2017 Capital Actual Amount Capital Leases, Future Minimum Payments, Interest Included in Payments Imputed interest Capital to Risk Weighted Assets Actual Ratio (as a percent) Capital Required for Capital Adequacy to Risk Weighted Assets Minimum Capital Requirements Ratio (as a percent) Total risk-based capital ratio (as a percent) Capital Required to be Well Capitalized to Risk Weighted Assets Minimum To Be Well Capitalized Under Prompt Correction Action Provisions Ratio (as a percent) Capital Required for Capital Adequacy Minimum Capital Requirements Amount Capital Required to be Well Capitalized Minimum To Be Well Capitalized Under Prompt Correction Action Provisions Amount Carrying Amount Carrying (Reported) Amount, Fair Value Disclosure [Member] Cash Equivalents, at Carrying Value Short-term investments Cash Cash Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months Interest Income (Expense) on hedge ineffectiveness related to next twelve months Cash and Cash Equivalents, at Carrying Value Total cash and cash equivalents Cash and cash equivalents, beginning of year Cash and cash equivalents, end of year Cash and cash equivalents Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Due from Banks Cash and due from banks Net (decrease) increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Hedge gain reclassified as interest expense Cash Flow Hedge Gain Reclassified to Interest Expense Supplemental schedule of noncash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Cash or deposits reserve balances Cash Reserve Deposit Required and Made Summary of Purchased credit impaired loans (PCI) Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Table Text Block] Carrying amount Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net Beginning balance End balance Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Accretion Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion Cash flows expected to be collected Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition Reclassifications from nonaccretable difference Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference Fair value of loans acquired Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value Acquisitions Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Additions Contractually required payments receivable Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period [Abstract] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Disposals of Loans Disposals and transfers Class of Warrant or Right [Table] Class of Warrant or Right [Line Items] Troubled Asset Relief Capital Purchase Program Class of Warrant or Right [Domain] Authorized Shares Class of Stock [Line Items] Class of Warrant or Right [Axis] Class of Stock [Domain] Class of Warrant or Right, Number of Securities Called by Warrants or Rights Number of shares repurchased by common stock warrant Commercial Real Estate Commercial Real Estate Portfolio Segment [Member] Commercial Loan [Member] Commercial business Commercial and Industrial Commercial business loans Commercial & Industrial Commercial Portfolio Segment [Member] Commercial business Commercial Real Estate Construction Financing Receivable [Member] Construction Construction loans Commercial Real Estate [Member] Commercial real estate Commercial Real Estate Commercial real estate mortgages Commitments and Contingencies Disclosure [Text Block] Commitments, Contingent Liabilities and Other Off-Balance Sheet Risks Commitments, Contingent Liabilities and Other Off-Balance Sheet Risks Commitments and Contingencies. Commitments and contingencies Common stock, outstanding Common Stock, Shares, Outstanding Common Stock, Value, Issued Common stock Common stock, issued Common Stock, Shares, Issued Common Stock, Dividends, Per Share, Declared Cash dividends declared per common share: (in dollars per share) Dividends on common stock (in dollars per share) Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common Stock Dividends, Shares Dividends on common stock at $0.36 and $ 0.36 per share for the period ended June 30, 2013 and 2012, respectively (in shares) Employee Benefit Plans Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Capital and Regulatory Matters Deferred tax assets Components of Deferred Tax Assets [Abstract] Components of Deferred Tax Assets and Liabilities [Abstract] Significant portions of the deferred tax assets and deferred tax liabilities Deferred tax liabilities Components of Deferred Tax Liabilities [Abstract] Other Comprehensive Income Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive Income (Loss) Note [Text Block] Other Comprehensive Income Comprehensive Income Comprehensive Income, Policy [Policy Text Block] Concentration Risk Type [Domain] Concentrations of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentration Risk Type [Axis] Condensed Parent Information Condensed Financial Information of Parent Company Only Disclosure [Text Block] Condensed Parent Information Principles of Consolidation Consolidation, Policy [Policy Text Block] Consumer Consumer Portfolio Segment [Member] Consumer Loan [Member] Consumer Core Deposit Intangible Core Deposits [Member] Expenses: Costs and Expenses [Abstract] Total expenses Costs and Expenses State Current State and Local Tax Expense (Benefit) Current provision (benefit) Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Total current provision (benefit) Current Income Tax Expense (Benefit) Federal Current Federal Tax Expense (Benefit) Loans rated 9 Doubtful [Member] Variable interest rate basis Debt Instrument, Description of Variable Rate Basis Debt Instrument [Line Items] Wholesale Repurchase Agreements Junior Subordinated Debentures Issued to Affiliated Trusts Schedule of Long-term Debt Instruments [Table] Debt, Weighted Average Interest Rate Weighted Average Cost Borrowings Debt Disclosure [Text Block] Borrowings Spread on variable rate basis (as a percent) Debt Instrument, Basis Spread on Variable Rate Debt Instrument [Axis] Cost of Junior Subordinated Debentures issued to affiliated trusts (as a percent) Debt Instrument, Interest Rate, Effective Percentage Debt Instrument, Name [Domain] Prepaid expenses Deferred Tax Liabilities, Prepaid Expenses Deferred Compensation, Share-based Payments [Member] Unearned Restricted Stock Deferred Compensation Deferred Compensation Arrangements [Abstract] Deferred Compensation Equity Unearned restricted stock Unrealized loss on available for sale securities Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross Deferred compensation expense Deferred Compensation Arrangement with Individual, Compensation Expense Deferred compensation liability Deferred Compensation Arrangement with Individual, Recorded Liability Federal Deferred Federal Income Tax Expense (Benefit) Deferred (benefit) provision Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Total deferred tax liability Deferred Tax Liabilities, Gross Deferred Income Tax Expense (Benefit) Total deferred (benefit) provision Net deferred tax liability Deferred Tax Assets, Net Derivative basis differential Deferred Tax Assets, Derivative Instruments Total deferred tax asset Deferred Tax Assets, Gross State Deferred State and Local Income Tax Expense (Benefit) Unrealized loss on derivatives Deferred Tax Assets, Unrealized Losses on Trading Securities Other Deferred Tax Assets, Other Stock-based compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Deferred compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits Allowance for loan losses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses Other Deferred Tax Liabilities, Other Premises and equipment Deferred Tax Liabilities, Property, Plant and Equipment Goodwill and other intangible assets Deferred Tax Liabilities, Goodwill and Intangible Assets 401(k) Plan Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] Employer contributions Defined Contribution Plan, Cost Recognized Demand Deposit Accounts Noninterest bearing Demand Deposits Deposit Liabilities Disclosures [Text Block] Deposits. Total deposits Deposits NOW Deposits, Negotiable Order of Withdrawal (NOW) Deposits [Abstract] Deposits: Composition of deposits Deposits, Money Market Deposits Money market Deposits, Fair Value Disclosure Deposits Deposits [Member] Deposits Regular savings Deposits, Savings Deposits Depreciation and amortization of premises and equipment included in occupancy and equipment expense Depreciation, Depletion and Amortization Depreciation of premises and equipment Depreciation Derivative Instrument Risk [Axis] Interest rate caps Derivative Assets Other assets - interest rate caps Fair value of interest rate caps Derivative [Line Items] Derivative Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivatives Derivative, Collateral, Right to Reclaim Cash Margin account balance Derivative, Average Fixed Interest Rate Weighted average receive rate Interest rate received over base rate Maturity term Derivative, Remaining Maturity Derivative Financial Instruments, Liabilities, Fair Value Disclosure Other liabilities - interest rate swap Interest rate swaps Fair value of interest rate swaps Derivative Liabilities Weighted average maturity Derivative, Average Remaining Maturity Derivative [Table] Derivatives Variable rate basis Derivative, Description of Variable Rate Basis Variable rate basis of derivative Derivative, Cap Interest Rate Strike rate based on three month LIBOR Strike rate (as a percent) Derivative, Average Variable Interest Rate Weighted average pay rate Interest rate paid Number of derivative instruments held Derivative, Number of Instruments Held Number of derivative instruments Derivative Contract Type [Domain] Interest income (expense) on hedge ineffectiveness and excluded from effectiveness testing Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net Derivatives Derivatives, Policy [Policy Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock-Based Compensation Stock-Based Compensation Discontinued Operation, Tax Effect of Discontinued Operation Income tax expense Pretax gain on sale of customer lists and certain fixed assets of an agency office Gain on sale of assets Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax Gain on sale of discontinued operations Pre-tax gain recognized Discontinued Operations Discontinued Operations, Policy [Policy Text Block] Severance and other direct expenses Pre-tax gain recognized Discontinued Operation, Provision for Loss (Gain) on Disposal, before Income Tax Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax Income from discontinued operations Income from discontinued operations before income tax expense Income from discontinued operations Discontinued Operations Fixed assets, net of accumulated depreciation Disposal Group, Including Discontinued Operation, Property, Plant, and Equipment, Net Sale proceeds Disposal Group, Including Discontinued Operation, Revenue Customer lists and other intangible assets, net Disposal Group, Including Discontinued Operation, Intangible Assets, Net Gain on sale of assets of insurance division Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Discontinued Operations Disposal Groups, Including Discontinued Operations, Name [Domain] Dividends, Common Stock Dividends on common stock at $0.36 per share for the period ended June 30, 2013 and 2012, respectively Dividends, Preferred Stock Dividends on preferred stock Earnings Per Share, Basic [Abstract] Basic: Earnings per common share: Earnings Per Share, Diluted Net income (in dollars per share) Diluted earnings per common share (in dollars per share) Earnings Per Share, Basic, Other Disclosures [Abstract] Weighted-average shares outstanding: Earnings Per Share, Diluted [Abstract] Diluted: Diluted earnings per common share: Earnings Per Share, Basic Net income (in dollars per share) Earnings per common share (in dollars per share) Earnings Per Share [Text Block] Earnings Per Common Share Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Earnings Per Common Share Earnings per common share: Statutory federal income tax rate (as a percent) Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate Tax benefit related to stock-based compensation expense Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Unrecognized compensation expense Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options Investment in subsidiary Equity Method Investments Equity Component [Domain] Equity securities Equity Securities [Member] Total Fair Value Measurement Estimate of Fair Value, Fair Value Disclosure [Member] Measurement Frequency [Axis] Financial instruments which represent credit risk Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability Fair Value, Hierarchy [Axis] Recurring Fair Value, Measurements, Recurring [Member] Fair Value, Measurement Frequency [Domain] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Measurements Fair Value Disclosures [Text Block] Fair Value Measurements Fair Value, Measurements, Nonrecurring [Member] Nonrecurring Assets Measured at Fair Value on Nonrecurring Basis Fair Value Measurements, Nonrecurring [Table Text Block] Fair Value, by Balance Sheet Grouping [Table Text Block] Estimated Fair Value of Company's Financial Instruments Fair Value, Disclosure Item Amounts [Domain] Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis] Fair Value, Inputs, Level 3 [Member] Level 3 Fair Value, Inputs, Level 1 [Member] Level 1 Fair Value, Inputs, Level 2 [Member] Level 2 Subordinated Debt Obligations, Fair Value Disclosure Subordinated debentures Commitments Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Federal Home Loan Bank Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] Loans pledged as collateral with the FHLB for borrowings Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged General disclosures Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures [Abstract] Available line of credit arrangement with the FHLB Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds FHLB advances Advances by Federal Home Loan Bank Federal Home Loan Bank Stock and Federal Reserve Bank Stock Regulatory stock Federal Home Loan Bank and Federal Reserve Bank stock, at cost Federal Home Loan Bank Branch [Axis] Federal Home Loan Bank, Advances, Branch of FHLB Bank, State [Domain] Federal Home Loan Bank Stock Federal Home Loan Bank stock, at cost Federal Deposit Insurance Corporation Premium Expense FDIC insurance premiums Additional capacity to borrow Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available 2014 Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, One to Two Years from Balance Sheet Date 2015 Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, Two to Three Years from Balance Sheet Date 2017 Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Five Federal Reserve Bank Stock Federal Reserve Bank stock, at cost 2015 Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Three 2013 Federal Home Loan Bank, Advances, Maturities Summary, Due in Next Twelve Months 2014 Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Two 2016 Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Four Weighted Average Cost Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due [Abstract] 2013 Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due within One Year of Balance Sheet Date 2016 Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, Three to Four Years from Balance Sheet Date Carrying Amount Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract] Total (as a percent) Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Weighted Average Interest Rate Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, after Five Years from Balance Sheet Date 2018 Total Long-term Federal Home Loan Bank Advances Federal Home Loan Bank advances 2017 Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, Four to Five Years from Balance Sheet Date Federal Home Loan Bank, Advances, Maturities Summary, Due after Year Five 2018 Fees and Commissions, Other Fees for other services to customers Financial Instrument [Axis] Standby letters of credit Financial Standby Letter of Credit [Member] Financing Receivable Allowance [Domain] Financing Receivable, Modifications Financing Receivable, Modifications [Line Items] Past Due 90 Days or More-Still Accruing Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing Non-Accrual Loans Financing Receivable, Recorded Investment, Nonaccrual Status ASC 310-30 Financing Receivable, Acquired with Deteriorated Credit Quality Financing Receivable, Allowance for Credit Losses Financing Receivable, Allowance for Credit Losses [Line Items] Individually evaluated Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Financing Receivable, Recorded Investment Financing Receivable, Recorded Investment [Line Items] ASC 310-30 Financing Receivable, Allowance for Credit Losses, Acquired with Deteriorated Credit Quality 30-59 Days Financing Receivable, Recorded Investment, 30 to 59 Days Past Due Financing Receivables [Text Block] Loans, Allowance for Loan Losses and Credit Quality Credit Quality Indicator [Axis] Portfolio Segment [Axis] 60-89 Days Financing Receivable, Recorded Investment, 60 to 89 Days Past Due Financing Receivable, Impaired Financing Receivable, Impaired [Line Items] Individually evaluated Financing Receivable, Individually Evaluated for Impairment Financing Receivable, by Credit Quality Indicator [Domain] Total Current Financing Receivable, Recorded Investment, Current Commercial Loans by Risk Rating Financing Receivable Credit Quality Indicators [Table Text Block] Total Past Due Financing Receivable, Recorded Investment, Past Due Collectively evaluated Financing Receivable, Collectively Evaluated for Impairment Collectively evaluated Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Amortization period Finite-Lived Intangible Asset, Useful Life Finite-Lived Intangible Assets, Major Class Name [Domain] 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Five Gross carrying amount Finite-Lived Intangible Assets, Gross Components of identifiable intangible assets Finite-Lived Intangible Assets [Line Items] 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Three Estimated annual amortization expense associated with intangible assets Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Finite-Lived Intangible Assets by Major Class [Axis] Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five 2014 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2015 Finite-Lived Intangible Assets, Amortization Expense, Year Two Identifiable Intangibles Finite-lived Intangible Assets [Roll Forward] Balance at the beginning of period Balance at the end of period Net carrying amount Finite-Lived Intangible Assets, Net Repossessed Assets Real estate owned and other possessed collateral, net Real estate owned and other repossessed collateral Total gain on sale of discontinued operations Gain (Loss) on Disposition of Real Estate, Discontinued Operations Loss on disposition of premises and equipment Gain (Loss) on Sale of Property Plant Equipment Income on hedge ineffectiveness Gain on Fair Value Hedge Ineffectiveness Net (gain) loss on sale of available-for-sale securities Gain (Loss) on Sale of Securities, Net Gain on sales of loans held for sale Gain (Loss) on Sales of Loans, Net General and administrative expenses General and Administrative Expense Balance at the end of period Balance at the beginning of period Goodwill Assets sold or disposed Goodwill, Written off Related to Sale of Business Unit Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Goodwill Goodwill [Roll Forward] Intangible Assets Home Equity Line of Credit [Member] Home equity Interest Income Recognized, with a valuation allowance Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method Average Recorded Investment, with a valuation allowance Impaired Financing Receivable, with Related Allowance, Average Recorded Investment Impaired Loans Impaired Financing Receivables [Table Text Block] Interest Income Recognized, without a valuation allowance Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method Recorded Investment, with a valuation allowance Impaired Financing Receivable, with Related Allowance, Recorded Investment Average Recorded Investment Impaired Financing Receivable, Average Recorded Investment Unpaid Principal Balance, without a valuation allowance Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance Unpaid Principal Balance Impaired Financing Receivable, Unpaid Principal Balance Recorded Investment Impaired Financing Receivable, Recorded Investment Collateral dependent impaired loans Recorded Investment, without a valuation allowance Impaired Financing Receivable, with No Related Allowance, Recorded Investment Related Allowance Impaired Financing Receivable, Related Allowance Average Recorded Investment, without a valuation allowance Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment Unpaid Principal Balance, with a valuation allowance Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance Interest Income Recognized Impaired Financing Receivable, Interest Income, Cash Basis Method Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Discontinued operations: Net income from discontinued operations Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Income from continuing operations before income tax expense Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share Income from discontinued operations (in dollars per share) Income from discontinued operations CONSOLIDATED STATEMENTS OF INCOME Income Taxes Income Tax Disclosure [Text Block] Income Taxes Income (Loss) from Continuing Operations Attributable to Parent Net income from continuing operations Net income from continuing operations Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share Income from discontinued operations (in dollars per share) Income from discontinued operations Loss before income tax benefit and equity in undistributed net income of subsidiary Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Equity in undistributed net income of subsidiary Undistributed earnings of subsidiary Income (Loss) from Equity Method Investments Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table] Disposal Group Name [Axis] Income (Loss) from Continuing Operations, Per Basic Share Income from continuing operations (in dollars per share) Income (loss) from continuing operations Income (loss) from continuing operations Income (Loss) from Continuing Operations, Per Diluted Share Income from continuing operations (in dollars per share) Income Tax Expense (Benefit) Income tax expense Total tax provision Income tax benefit Expected income tax expense at federal tax rate Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate Reconciliation between the statutory federal income tax rate and the effective tax rate on income from continuing operations Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] (Loss) income before equity in undistributed net income of subsidiary Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest State tax, net of federal tax benefit Income Tax Reconciliation, State and Local Income Taxes Income Taxes Income Tax, Policy [Policy Text Block] Other Income Tax Reconciliation, Other Reconciling Items Income Taxes Paid Income taxes paid, net Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Net income from discontinued operations Net increase in deposits Increase (Decrease) in Deposits Interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Changes in other assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Other assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Increase in other assets and liabilities Repayment of FHLB borrowings and wholesale repurchase agreements Increase (Decrease) in Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Net Other assets Increase (Decrease) in Other Operating Assets Other liabilities Increase (Decrease) in Other Operating Liabilities Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity Information Technology and Data Processing Data processing fees Insurance commissions Insurance Commissions and Fees Intangible Assets Intangible Assets, Finite-Lived, Policy [Policy Text Block] Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Interest and Dividend Income, Operating [Abstract] Interest and dividend income: Income: Interest and Fee Income, Loans and Leases Interest on loans Interest Expense Total interest expense Interest expense Interest and Dividend Income, Operating Total interest and dividend income Interest Expense [Abstract] Interest expense: Interest and Dividend Income, Securities, Available-for-sale Interest and dividends on available-for-sale securities Interest Expense, Federal Home Loan Bank and Federal Reserve Bank Advances, Long-term Federal Home Loan Bank advances Interest Expense, Deposits Deposits Interest Expense, Junior Subordinated Debentures Junior subordinated debentures issued to affiliated trusts Interest expense Interest Income (Expense), Net Net interest and dividend income before provision for loan losses Interest Expense, Short-term Borrowings Short-term borrowings Interest Expense, Securities Sold under Agreements to Repurchase Wholesale repurchase agreements Interest Expense, Lessee, Assets under Capital Lease Obligation under capital lease agreement Interest Income (Expense), after Provision for Loan Loss Net interest and dividend income after provision for loan losses Interest Rate Swap [Member] Interest rate swap Interest Rate Swap Interest Receivable Accrued interest receivable Interest-bearing Deposit Liabilities Interest bearing Interest Paid Interest paid Interest Rate Cap [Member] Interest rate caps Interest Rate Caps Interest rate cap Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions Investment commissions Amortized Cost and Fair Values of Available-for-Sale Debt Securities by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Available-for-sale Securities Available-for-sale Securities Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust Junior subordinated debentures issued to affiliated trusts Carrying Amount of Junior Subordinated Debentures issued to affiliated trusts Long-term Debt, Type [Domain] Long-term Debt, Type [Axis] Labor and Related Expense Salaries and employee benefits Land Land [Member] Rental expense Operating Leases, Rent Expense Lease Obligations Leases, Operating [Abstract] Legal settlement expense Legal Fees Liabilities [Abstract] Liabilities Financial liabilities: Liabilities Total liabilities Liabilities and Equity [Abstract] Liabilities and Stockholders' Equity Liabilities and Stockholders' Equity: Liabilities and Equity Total liabilities and stockholders' equity Litigation Case Type [Domain] Litigation Case [Axis] Commitments to originate loans Loan Origination Commitments [Member] Loans [Member] Loans Allowance for Loan Losses Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block] Loans and Leases Receivable, Allowance Less: Allowance for loan losses Ending balance Beginning balance Total Loans and Leases Receivable, Gross Loans loans Total Loans Non-Accrual Loans Amount of loan transactions with related parties Loans and Leases Receivable, Related Parties Loans Receivable Held-for-sale, Net Loans held for sale Real Estate Owned and Other Repossessed Collateral Loans and Leases Receivable, Real Estate Acquired Through Foreclosure, Policy [Policy Text Block] Loans held for sale Loans Held-for-sale, Fair Value Disclosure Loans and Leases Receivable, Net Amount Loans, net Loans, net Loans Receivable, Fair Value Disclosure Loans, net Loans Receivable, Net Loans: Loans Receivable, Net [Abstract] Loss Contingencies [Table] Damages sought Loss Contingency, Damages Sought, Value Contingencies Loss Contingencies [Line Items] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Investment Securities Marketable Securities, Policy [Policy Text Block] Marketing Expense Marketing expense Maximum [Member] Maximum Minimum [Member] Minimum Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Agency mortgage-backed securities Non-performing Nonperforming Financing Receivable [Member] Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Net Income (Loss) Available to Common Stockholders, Basic Net income available to common stockholders Net income from continuing operations available to common shareholders Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net Income (Loss) Attributable to Parent Net income Net income Net income from continuing operations Income from discontinued operations Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Recent Accounting Pronouncements Noninterest Income, Other Operating Income Other noninterest income Other noninterest income (expense) Noninterest Income, Other Noninterest Income [Abstract] Noninterest income: Noninterest Expense [Abstract] Noninterest expense: Noninterest Income Total noninterest income Noninterest Expense Total noninterest expense Nonvoting Common Stock [Member] Non-voting common stock Non-voting Common Stock Notional amount Notional Amount of Interest Rate Cash Flow Hedge Derivatives Number of offices Number of Stores Occupancy, Net Occupancy and equipment expense 2019 and thereafter Operating Leases, Future Minimum Payments, Due Thereafter Future minimum lease payments over the remaining terms of leases Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2016 Operating Leases, Future Minimum Payments, Due in Three Years 2015 Operating Leases, Future Minimum Payments, Due in Two Years 2014 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2017 Operating Leases, Future Minimum Payments, Due in Four Years 2018 Operating Leases, Future Minimum Payments, Due in Five Years Total Operating Leases, Future Minimum Payments Due Basis of Presentation Total other comprehensive (loss) income Other Comprehensive Income (Loss), before Tax Total other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax Other comprehensive income, net of tax Other Assets Other assets Total available-for-sale securities Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Unrealized gain (loss) on available-for-sale securities, net Reclassification adjustment for net gains included in net income Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Tax (Gain) loss on sale or impairment of repossessed collateral, net Other Noncash Income (Expense) Total derivatives and hedging activities Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax Reclassification adjustment for net gains included in net income Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Tax Income tax (benefit) expense related to other comprehensive (loss) income Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Unrealized (losses) gains on available-for-sale securities, net Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax Total available-for-sale securities Other Comprehensive Income (Loss), Available-for-sale Securities, Tax Reclassification adjustment for net gains included in net income Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax Reclassification adjustments for net gains included in net income Reclassification adjustment for net gains included in net income Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax Total derivatives and hedging activities Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Other Intangibles Other Intangible Assets [Member] Reclassification adjustment for net gains included in net income Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, before Tax Reclassification adjustment for net gains included in net income Other borrowings Other Borrowings Other-than-temporary impairment losses on securities Other than Temporary Impairment Losses, Investments, Available-for-sale Securities Total available-for-sale securities Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax Reclassification adjustment for net gains included in net income Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax Total derivatives and hedging activities Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Unrealized loss on purchased interest rate caps and swap, net Total other comprehensive (loss) income Other Comprehensive Income (Loss), Tax Other comprehensive income, net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Change in net unrealized gain or loss on available-for-sale securities Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax Change in accumulated loss on effective cash flow hedges Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Change in accumulated loss on effective cash flow hedges Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax Change in accumulated loss on effective cash flow hedges Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax Change in net unrealized gain or loss on available-for-sale securities Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Change in net unrealized gain or loss on available-for-sale securities Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Other Noninterest Expense Other noninterest expense Other Other Liabilities Other liabilities Other Interest and Dividend Income Other interest and dividend income Other income Other comprehensive (loss) income, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other comprehensive income, net of tax Other assets Other Assets [Member] Other comprehensive (loss) income, before tax: Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract] Total available-for-sale securities Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent Derivatives and hedging activities: Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax, Portion Attributable to Parent [Abstract] Total derivatives and hedging activities Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax, Portion Attributable to Parent Other liabilities Other Liabilities [Member] Available-for-sale securities: Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent [Abstract] Total other comprehensive (loss) income, before tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Past Due and Non-Accrual Loans Past Due Financing Receivables [Table Text Block] Loans rated 1- 6 Pass [Member] Parent Company [Member] Northeast Bancorp Company Amount paid to redeem shares of preferred stock Payments for Repurchase of Preferred Stock and Preference Stock Payments for Federal Home Loan Bank Advances Repayment of Federal Home Loan Bank advances Payments for Origination and Purchases of Loans Held-for-sale Originations of loans held for sale Amount of warrants repurchased Payments for Repurchase of Warrants (Purchase) redemption of regulatory stock, net Payments for (Proceeds from) Federal Home Loan Bank Stock Payments of Stock Issuance Costs Stock offering costs Purchases of premises and equipment Payments to Acquire Property, Plant, and Equipment Increase in investment of bank subsidiary Payments to Acquire Interest in Subsidiaries and Affiliates Dividends paid on preferred stock Payments of Ordinary Dividends, Preferred Stock and Preference Stock Payments to Acquire Available-for-sale Securities Purchases of available-for-sale securities Dividends paid to stockholders Payments of Ordinary Dividends Loan purchases Payments to Acquire Loans Held-for-investment Dividends paid on common stock Payments of Ordinary Dividends, Common Stock Payments to Purchase Loans Held-for-sale Originations of loans held for sale Employee Benefit Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Plan Name [Domain] Plan Name [Axis] Preferred Stock, Value, Issued Preferred stock, $1.00 par value, 1,000,000 shares authorized; no shares issued and outstanding at June 30, 2013; 4,227 shares issued and outstanding at June 30, 2012; liquidation preference of $1,000 per share Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred Stock Dividends, Shares Dividends on preferred stock (in shares) Preferred Stock, Dividend Rate, Percentage Cumulative dividends rate Preferred stock, shares issued Preferred Stock, Shares Issued Preferred stock dividends and accretion Preferred Stock Dividends and Other Adjustments Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred Stock, Liquidation Preference Per Share Preferred stock, liquidation preference per share (in dollars per share) Liquidation preference (in dollars per share) Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Preferred Stock [Member] Preferred Stock Reclassifications Reclassification, Policy [Policy Text Block] Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase Repayment of structured repurchase agreements Proceeds from Divestiture of Businesses Proceeds from sale of assets of insurance division Sale proceeds Loan originations and principal collections, net Proceeds from Loan and Lease Originations and Principal Collections Net decrease short-term borrowings Proceeds from (Repayments of) Short-term Debt Net proceeds from issuance of common stock Proceeds from Issuance of Common Stock Proceeds from issuance of common stock Proceeds from Issuance of Preferred Stock and Preference Stock Aggregate proceeds issuance of cumulative perpetual preferred stock Proceeds from maturities and principal payments on available-for-sale securities Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Proceeds from sales of available-for-sale securities Proceeds from Sale of Available-for-sale Securities Proceeds from life insurance benefits Proceeds from Life Insurance Policies Proceeds from sales of premises and equipment Proceeds from Sale of Property, Plant, and Equipment Net proceeds from sales of loans held for sale Proceeds from Sale of Loans Held-for-sale Proceeds from sales of portfolio loans Proceeds from Sale of Loans Held-for-investment Proceeds from sales of real estate owned and other repossessed collateral Proceeds from Sale of Foreclosed Assets Proceeds from redemption of regulatory stock Proceeds from Sale of Federal Reserve Stock Professional Fees Professional fees Estimated useful life Property, Plant and Equipment, Estimated Useful Lives Property, Plant and Equipment, Type [Domain] Premises and Equipment Premises and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Property, Plant and Equipment, Net Premises and equipment, net Net premises and equipment Premises and Equipment Property, Plant and Equipment [Line Items] Gross premises and equipment Property, Plant and Equipment, Gross Schedule of premises and equipment Property, Plant and Equipment [Table Text Block] Property, Plant and Equipment, Type [Axis] Premises and Equipment Property, Plant and Equipment Disclosure [Text Block] Provision for Loan and Lease Losses Provision for loan losses Range [Axis] Range [Domain] Receivable Type [Domain] Loans, Allowance for Loan Losses and Credit Quality Capital and Regulatory Matters Regulatory Capital Requirements under Banking Regulations [Text Block] Regulatory stock Regulatory Assets, Noncurrent Repayment of other borrowings Repayments of Other Debt Repayment of capital lease obligation Repayments of Long-term Capital Lease Obligations Residential real estate Residential Real Estate [Member] Residential Real Estate Residential Portfolio Segment [Member] Residential Mortgage [Member] Residential real estate Residential real estate mortgages Restricted Stock [Member] Restricted stock Retained Earnings (Accumulated Deficit) Retained earnings Retained Earnings [Member] Retained Earnings Loans rated 8 Substandard [Member] Options outstanding at end of period, Weighted Average Exercise Price Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price Exercise price (in dollar per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price Exercisable Weighted Average Exercise Price Exercisable Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Expected life Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Exercisable Weighted Average Remaining Life Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term Exercisable Weighted Average Remaining Life Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Outstanding Weighted Average Remaining Life Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Outstanding Weighted Average Remaining Life Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term Schedule of estimated annual amortization expense associated with intangible assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Short-term borrowings Short-term Debt, Fair Value Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block] Summary of restricted stock activity Estimated Amount and Timing of Future Pre-tax Stock-based Compensation Expense Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block] Schedule of Impaired Financing Receivable [Table] Schedule of current and deferred components of income tax expense from continuing operations Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Assets and Liabilities Measured at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Stock Option Activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of components of other comprehensive (loss) income Schedule of Comprehensive Income (Loss) [Table Text Block] Realized Gains and Losses on Available-for-Sale Securities Schedule of Realized Gain (Loss) [Table Text Block] Schedule of a option-pricing model weighted-average assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Available-for-sale Securities [Table] Number of Shares Outstanding for Basic and Diluted EPS Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of future minimum lease payments over the remaining term of the lease and the outstanding capital lease obligation Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block] Average Anti-dilutive Options and Warrants Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of reconciliation between the statutory federal income tax rate and the effective tax rate on income from continuing operations Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Schedule of approximate future minimum lease payments over the remaining terms of the Company's leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of significant portions of the deferred tax assets and deferred tax liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Condensed Financial Information Balance Sheet Schedule of Condensed Balance Sheet [Table Text Block] Fair Values and Location of Derivatives Designated as Hedging Instruments Schedule of Interest Rate Derivatives [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Gross Unrealized Losses and Fair Values Aggregated by Investment Category and Length of Time in Continuous Unrealized Loss Position Schedule of Unrealized Loss on Investments [Table Text Block] Schedule of components of identifiable intangible assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities Condensed Financial Information Statements of Cash Flow Schedule of Condensed Cash Flow Statement [Table Text Block] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Schedule of Company's and Bank's regulatory capital ratios Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Schedule of components of accumulated other comprehensive (loss) income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Condensed Financial Information Statements of Income Schedule of Condensed Income Statement [Table Text Block] Schedule of Fair Value, Off-balance Sheet Risks [Table] Schedule of Federal Home Loan Bank Advances, by Branch of FHLB Bank [Table] Summary of Sale Transactions Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block] Summary of fixed-rate long term advances from the Federal Home Loan Bank of Boston Schedule of Federal Home Loan Bank, Advances, by Branch of FHLB Bank [Table Text Block] Outstanding Interest Rate Caps and Swap Agreements Used to Hedge Variable Rate Debt Schedule of Derivative Instruments [Table Text Block] Summary of Junior Subordinated Debentures issued by the Company Schedule of Subordinated Borrowing [Table Text Block] Information about Stock Options Outstanding Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Summary of wholesale repurchase agreements Schedule of Repurchase Agreements [Table Text Block] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Schedule of Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Axis] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Property, Plant and Equipment [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Stock by Class [Table] Composition of Company Loan Portfolio Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure Wholesale repurchase agreements Securities Sold under Agreements to Repurchase [Member] Securities sold under wholesale repurchase agreements Securities Sold under Agreements to Repurchase Wholesale repurchase agreements Carrying Amount Segment, Operating Activities [Domain] Segment, Discontinued Operations [Member] NGIB Segment, Discontinued Operations Stock Awards Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Stock-based compensation Share-based Compensation Forfeited, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted average grant date fair value of restricted stock granted to the senior executive (in dollars per share) Granted (in dollars per share) Expected volatility, maximum (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Forfeited (in shares) Expected volatility, minimum (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Unvested at beginning of period (in dollars per share) Unvested at end of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Number of additional shares authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Risk-free interest rate, maximum (as a percent) Weighted Average Grant-Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Granted, shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award Stock-Based Compensation Shares Restricted stock activity Unvested at beginning of period (in shares) Unvested at end of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Granted, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Restricted stock granted to a senior executive Granted (in shares) Risk-free interest rate, minimum (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Exercised, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Risk-free interest rate (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Expected volatility (as a percent) Exercisable Weighted Average Exercise Price Options Exercisable, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Dividend yield (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Options Exercisable Number Options Exercisable, Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Exercisable, end of year (in shares) Exercisable, beginning of year (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Number of shares authorized Assumptions: Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Forfeited or expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Forfeited, shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Options Exercisable Number Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options Exercise Price Range [Axis] Information by exercise price Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Options outstanding at end of period, Weighted Average Exercise Price Options outstanding at beginning of year, Weighted Average Exercise Price (in dollars per share) Options outstanding at end of year, Weighted Average Exercise Price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Outstanding Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Options Outstanding Number Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options Options Outstanding Number Outstanding at beginning of year, Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Outstanding at end of year, Shares Award Type [Domain] Stock-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Financial Instruments Subject to Mandatory Redemption, Financial Instrument [Domain] Shares, Issued Balance (in shares) Balance (in shares) Short-term Debt Short-term borrowings Short-term Debt [Abstract] Short-Term Borrowings Short-term Debt, Weighted Average Interest Rate Weighted average interest rate on short-term borrowings (as a percent) Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Loans rated 7 Special Mention [Member] 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Flow Information [Abstract] Supplemental schedule of cash flow information: Tier One Leverage Capital Required for Capital Adequacy to Average Assets Minimum Capital Requirements Ratio (as a percent) Tier 1 leverage ratio (as a percent) Tier One Leverage Capital to Average Assets Actual Ratio (as a percent) Tier One Risk Based Capital to Risk Weighted Assets Actual Ratio (as a percent) Tier One Risk Based Capital Required to be Well Capitalized Minimum To Be Well Capitalized Under Prompt Correction Action Provisions Amount Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Minimum Capital Requirements Ratio (as a percent) Tier One Risk Based Capital Actual Amount Tier One Risk Based Capital Required for Capital Adequacy Minimum Capital Requirements Amount Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets Minimum To Be Well Capitalized Under Prompt Correction Action Provisions Ratio (as a percent) Tier One Leverage Capital Required for Capital Adequacy Minimum Capital Requirements Amount Tier One Leverage Capital Required to be Well Capitalized Minimum To Be Well Capitalized Under Prompt Correction Action Provisions Amount Tier One Leverage Capital Required to be Well Capitalized to Average Assets Minimum To Be Well Capitalized Under Prompt Correction Action Provisions Ratio (as a percent) Tier One Leverage Capital Actual Amount 2016 Time Deposit Maturities, Year Three 2018 Time Deposit Maturities, Year Five Thereafter Time Deposit Maturities, after Year Five 2014 Time Deposit Maturities, Next Twelve Months 2017 Time Deposit Maturities, Year Four Time Deposits Time deposits Total Scheduled maturities of time certificates Time Deposits, Fiscal Year Maturity [Abstract] 2015 Time Deposit Maturities, Year Two Transfers from real estate owned to loans Transfer from Other Real Estate Transfer of Financial Assets Transfers and Servicing of Financial Assets, Policy [Policy Text Block] Types of Financial 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