Guaranteed Preferred Beneficial Interests in Company's Junior Subordinated Deferrable Interest Debentures (Trust-Preferred Securities) and Interest Rate Swap Agreements Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Schedule of Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Axis] Schedule of Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Axis] Financial Instruments Subject to Mandatory Redemption, Financial Instrument [Domain] Financial Instruments Subject to Mandatory Redemption, Financial Instrument [Domain] Trust preferred investments Trust Preferred Securities Subject to Mandatory Redemption [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Northwest Bancorp Capital Trust III Northwest Bancorp Capital Trust I I I [Member] Represents information pertaining to Northwest Bancorp Capital Trust III, a Delaware statutory business trust. Northwest Bancorp Statutory Trust IV Northwest Bancorp Statutory Trust I V [Member] Represents information pertaining to Northwest Bancorp Statutory Trust IV, a Connecticut statutory trust. LNB Trust II LNB Trust II [Member] LNB Trust II [Member] Guaranteed Preferred Beneficial Interests in the Company's Junior Subordinated Deferrable Interest Debentures (Trust Preferred Securities) and Interest Rate Swaps Class of Stock [Line Items] Total value of cumulative trust preferred securities issued Trust Preferred Issued Total Value The element represents the total face value of cumulative trust preferred securities issued. Junior subordinated deferrable interest debentures held by trusts that issued guaranteed capital debt securities Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust Segment Reporting [Abstract] Schedule of financial information for reportable segments Schedule of Segment Reporting Information, by Segment [Table Text Block] Investments, Debt and Equity Securities [Abstract] Investment Holdings [Table] Investment Holdings [Table] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] U.S. Government and agencies US Government Agencies Debt Securities [Member] Corporate debt issues Corporate Debt Securities [Member] Equity securities Equity Securities [Member] Municipal securities US States and Political Subdivisions Debt Securities [Member] Residential mortgage-backed securities - agency Residential Mortgage Backed Securities [Member] Investment Secondary Categorization [Axis] Investment Secondary Categorization [Axis] Investments by Secondary Categorization [Domain] Investments by Secondary Categorization [Domain] Agency CMOs Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Marketable securities Investment Holdings [Line Items] Less than 12 months - Fair value Held to Maturity and Available for Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value This item represents the aggregate fair value of investments in debt and equity securities categorized as held-to-maturity and available-for-sale securities that have been in a continuous unrealized loss position for less than twelve months. Less than 12 months - Unrealized loss Held to Maturity and Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1 This item represents the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months. 12 months or more - Fair value Held to Maturity and Available for Sale Securities Continuous Unrealized Loss Position Twelve Months or Longer Fair Value This item represents the aggregate fair value of investments in debt and equity securities categorized as held-to-maturity and available-for-sale securities that have been in a continuous unrealized loss position for twelve months or longer. 12 months or more - Unrealized loss Held to Maturity and Available for Sale Securities Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses 2 Amount of the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for securities which are categorized as held-to-maturity and available-for-sale securities. Total - Fair value Held to Maturity and Available for Sale Securities Continuous Unrealized Loss Position Fair Value This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized as held-to-maturity and available-for-sale securities. Total - Unrealized loss Held to Maturity and Available for Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1 This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized as held-to-maturity and available-for-sale securities. Number of investments that are temporarily impaired Number of Investment Positions with Unrealized Losses Disclosure regarding factors used to determine that the impairment of securities which include securities held-to-maturity, trading securities and securities available-for-sale where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the marketable investments determined to be temporarily impaired. Aggregate carrying amount of cost-method investment Cost Method Investments Regulatory Capital Requirements [Abstract] Schedule of actual, required, and well capitalized levels Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Statement of Stockholders' Equity [Abstract] Other comprehensive income, tax Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Stock-based compensation expense, tax benefits Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Dividends paid, per share (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Condensed Financial Information of Parent Company Only Disclosure [Abstract] Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Parent Company Parent Company [Member] Statements of Financial Condition Condensed Balance Sheet Statements, Captions [Line Items] Assets Assets [Abstract] Total cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Marketable securities available-for-sale (amortized cost of $825,552 and $868,956) Available-for-sale Securities Investment in bank subsidiary Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Other assets Other Assets Total assets Assets Liabilities and Shareholders’ Equity Liabilities and Equity [Abstract] Liabilities: Liabilities [Abstract] Debentures payable Other liabilities Other Liabilities Total liabilities Liabilities Shareholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and shareholders’ equity Liabilities and Equity Receivables [Abstract] Serviced loans for others Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding Percentage of loan portfolio secured by properties located in Pennsylvania Percentage of Financing Receivable Portfolio Secured by Properties Represents the percentage of the loan portfolio secured by properties. Adjustable rate loans Loans Receivable with Variable Rates of Interest Fixed rate loans Loans Receivable with Fixed Rates of Interest Earnings Per Share [Abstract] Schedule of computation of basic and diluted earnings per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Compensation and Retirement Disclosure [Abstract] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Exercise Price Range [Axis] Exercise Price Range [Axis] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Exercise price $7.48 Exercise Price Dollars 7.48 [Member] Represents the exercise price 7.48 dollars. Exercise price $9.79 Exercise Price Dollars 9.79 [Member] Represents the exercise price 9.79 dollars. Exercise price $11.12 Exercise Price Dollars 11.12 [Member] Represents the exercise price 11.12 dollars. Exercise price $11.49 Exercise Price Dollars 11.49 [Member] Represents the exercise price 11.49 dollars. Exercise price $11.51 Exercise Price Dollars 11.51 [Member] Represents the exercise price 11.51 dollars. Exercise price $11.70 Exercise Price Dollars 11.70 [Member] Represents the exercise price 11.70 dollars. Exercise price $12.12 Exercise Price Dollars 12.12 [Member] Represents the exercise price 12.12 dollars. Exercise price $12.17 Exercise Price Dollars 12.17 [Member] Represents the exercise price 12.17 dollars. Exercise price $12.32 Exercise Price Dollars 12.32 [Member] Represents the exercise price 12.32 dollars. Exercise price $12.37 Exercise Price Dollars 12.37 [Member] Exercise Price Dollars12.37 [Member] Exercise price $12.44 Exercise Price Dollars 12.44 [Member] Represents the exercise price 12.44 dollars. Exercise Price $13.15 Exercise Price Dollars 13.15 [Member] Exercise Price Dollars13.15 [Member] Exercise price $14.15 Exercise Price Dollars 14.15 [Member] Exercise Price Dollars 14.15 Total $12.25 Exercise Price Dollars 12.25 [Member] Exercise Price Dollars 12.25 Outstanding and exercisable options Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Exercise price (in dollars per share) Share-based Compensation Shares Authorized under Stock Option Plans Exercise Price Customized exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans. Options outstanding: Share Based Compensation Shares Authorized under Stock Option Plans Exercise Price Range Outstanding Options [Abstract] Number of options (in shares) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options Weighted average remaining contract life (years) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term Options exercisable: Share Based Compensation Shares Authorized under Stock Option Plans Exercise Price Range Exercisable Options [Abstract] Number of options (in shares) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options Weighted average remaining term - vested (years) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term Schedule of Held-to-maturity Securities [Table] Schedule of Held-to-maturity Securities [Table] Debt Security [Axis] Debt Security [Axis] Major Types of Debt Securities [Domain] Major Types of Debt Securities [Domain] Residential mortgage-backed securities Fixed rate Fixed Rate Residential Mortgage [Member] Variable rate Adjustable Rate Residential Mortgage [Member] Pass-through Pass Through Mortgage Backed Securities [Member] Represents information pertaining to pass-through mortgage-backed securities. Marketable securities held to maturity Schedule of Held-to-maturity Securities [Line Items] Amortized cost Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] Due after five years through ten years Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount Due after ten years Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount Held-to-maturity securities, amortized cost Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment Gross unrealized holding gains Held-to-maturity Securities, Debt Maturities, Gross Unrealized Gain [Abstract] Due after five years through ten years Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Gross Unrealized Gain Represents the gross unrealized gains for securities, at a point in time, which are categorized as held-to-maturity securities and which are expected to mature after five years and through ten years from the balance sheet date. Due after ten years Held-to-maturity Securities, Debt Maturities, after Ten Years, Gross Unrealized Gain Represents the gross unrealized gains for securities, at a point in time, which are categorized as held-to-maturity securities and which are expected to mature after ten years from the balance sheet date. Held-to-maturity securities, gross unrealized holding gains Held-to-maturity Securities, Accumulated Unrecognized Holding Gain Gross unrealized holding losses Held-to-maturity Securities, Unrealized Losses [Abstract] Due after five years through ten years Held to Maturity Securities Debt Maturities After Five To Ten Years, Gross Unrealized Loss Held to Maturity Securities Debt Maturities After Five To Ten Years, Gross Unrealized Loss Due after ten years Held to Maturity Securities Debt Maturities After Ten Years Gross Unrealized Loss Represents the gross unrealized loss for securities, at a point in time, which are categorized as held-to-maturity securities and which are expected to mature after ten years from the balance sheet date. Held-to-maturity securities, gross unrealized holding losses Held-to-maturity Securities, Accumulated Unrecognized Holding Loss Fair value Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] Due after five years through ten years Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value Due after ten years Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value Held-to-maturity securities, fair value Held-to-maturity Securities, Fair Value Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Pension Plans Pension Plan [Member] Postretirement Healthcare Plan Other Postretirement Benefit Plan [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Defined Benefit Plan, Asset Categories [Axis] Defined Benefit Plan, Asset Categories [Axis] Plan Asset Categories [Domain] Plan Asset Categories [Domain] Mutual funds — debt Fixed Income Funds [Member] Mutual funds — equity Equity Funds [Member] Cash and cash equivalents Cash [Member] Employee benefit plans Defined Benefit Plan Disclosure [Line Items] Fair value of plan assets Defined Benefit Plan, Fair Value of Plan Assets Benefits expected to be paid in each year Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract] 2017 Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months 2018 Defined Benefit Plan, Expected Future Benefit Payments, Year Two 2019 Defined Benefit Plan, Expected Future Benefit Payments, Year Three 2020 Defined Benefit Plan, Expected Future Benefit Payments, Year Four 2021 Defined Benefit Plan, Expected Future Benefit Payments, Year Five 2021 to 2025 Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter Effect of 1-percent increase in the assumed health care cost trend rates Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract] Effect of 1-percent increase on health care cost percentage Defined Benefit Plan Effect of One Percentage Point Increase on Healthcare Cost Percentage The effect of a one-percentage-point increase on the healthcare cost percentage. Annual rate of increase in healthcare costs Defined Benefit Plan, Annual Rate Increase in Health Care Costs Represents the percentage of annual increase in healthcare costs. Effect of 1-percent increase in assumed health care cost trend rates on interest cost in current period Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components Effect of 1-percent increase in assumed health care cost trend rates on postretirement benefit obligation Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Personal Banking Personal Banking [Member] Represents information pertaining to personal banking. Commercial Banking Business Banking [Member] Represents information pertaining to business banking. Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Domain] Class of Financing Receivable, Type [Domain] Residential mortgage loans Residential Mortgage [Member] Home equity loans Home Equity Loan [Member] Consumer loans Consumer Loan [Member] Commercial real estate loans Real Estate Loan [Member] Commercial loans Commercial Loan [Member] Receivable Type [Axis] Receivable Type [Axis] Receivable [Domain] Receivable [Domain] Acquired loans evaluated individually for future credit losses Acquired Loans Evaluated Individually For Future Credit Losses [Member] Represents acquired loans evaluated individually for future credit losses. Composition of impaired loans by portfolio segment and by class of financing receivable Financing Receivable, Impaired [Line Items] Carrying value Impaired Financing Receivable, Recorded Investment Outstanding principal balance Impaired Financing Receivable, Unpaid Principal Balance Related impairment reserve Impaired Financing Receivable, Related Allowance Average recorded investment in impaired loans Impaired Financing Receivable, Average Recorded Investment Interest income/ accretion recognized Impaired Financing Receivable, Interest Income, Accrual Method Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Term notes payable to the FHLB of Pittsburgh: Notes Payable to Banks [Member] Revolving line of credit, FHLB of Pittsburgh Line of Credit [Member] Collateralized borrowings, due within one year Securities Sold under Agreements to Repurchase [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Due within one year, Amount Securities Sold under Agreements to Repurchase Due between one and two years, Amount Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Two Due between two and three years, Amount Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Three Due between three and four years, Amount Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Four Due between four and five years, Amount Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Five Due between five and ten years, Amount Federal Home Loan Bank Advances Maturities Summary Amount Due between Five and Ten Years of Balance Sheet Date Amount of Federal Home Loan Bank advances outstanding which are due between five and ten years of the balance sheet date. Total borrowed funds, Amount Debt and Capital Lease Obligations Revolving line of credit, FHLB of Pittsburgh, Amount Long-term Line of Credit Due within one year, Average rate Assets Sold under Agreements to Repurchase, Interest Rate Due between one and two years, Average rate Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, One to Two Years from Balance Sheet Date Due between two and three years, Average rate Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, Two to Three Years from Balance Sheet Date Due between three and four years, Average rate Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, Three to Four Years from Balance Sheet Date Due between four and five years, Average rate Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, Four to Five Years from Balance Sheet Date Due between five and ten years, Average rate Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, after Five Years from Balance Sheet Date Revolving line of credit, FHLB of Pittsburgh, Average rate Line of Credit Facility, Interest Rate at Period End Maximum commitment Line of Credit Facility, Maximum Borrowing Capacity Average amount of agreements outstanding Short-term Debt, Average Outstanding Amount Maximum amount of outstanding security repurchase agreement Short-term Debt, Maximum Amount Outstanding During Period Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Domain] Financing Receivables, Period Past Due [Domain] 30-59 days delinquent Financing Receivables, 30 to 59 Days Past Due [Member] 60-89 days delinquent Financing Receivables, 60 to 89 Days Past Due [Member] 90 days or greater delinquent Financing Receivables, Equal to Greater than 90 Days Past Due [Member] Originated Originated Loan [Member] Represents information pertaining to originated loans. Acquired Acquired Loan [Member] Represents total acquired loans. Loan payment delinquencies Financing Receivable, Recorded Investment, Past Due [Line Items] Total delinquency Financing Receivable, Recorded Investment, Past Due Current Financing Receivable, Recorded Investment, Current Total loans Loans and Leases Receivable, Net of Deferred Income 90 days or greater delinquent and accruing Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing Statement of Financial Position [Abstract] Cash and cash equivalents Cash and Due from Banks Interest-earning deposits in other financial institutions Interest-bearing Deposits in Banks and Other Financial Institutions Federal funds sold and other short-term investments Federal Funds Sold and Other Short-term Investments The amount outstanding of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold; for example, immediately available funds lent under agreements or contracts that mature in one business day or roll over under a continuing contract, regardless of the nature of the transaction or the collateral involved, excluding overnight lending for commercial and industrial purposes. Also include Federal Funds sold under agreements to resell on a gross basis, excluding (1) sales of term Federal Funds, (2) due bills representing purchases of securities or other assets by the reporting bank that have not yet been delivered and similar instruments, (3) resale agreements that mature in more than one business day involving assets other than securities, and (4) yield maintenance dollar repurchase agreements. Also includes other investments not otherwise specified in the taxonomy that will be realized in a short period of time, usually less than one year or the normal operating cycle, whichever is longer. Marketable securities held-to-maturity (fair value of $20,426 and $32,552) Held-to-maturity Securities Loans receivable, net of allowance for loan losses of $60,939 and $62,672 Loans Receivable, Net Disposal Group, Including Discontinued Operation, Assets Disposal Group, Including Discontinued Operation, Assets Accrued interest receivable Interest Receivable Real estate owned, net Real Estate Acquired Through Foreclosure Federal Home Loan Bank stock, at cost Federal Home Loan Bank Stock Premises and equipment, net Property, Plant and Equipment, Net Bank owned life insurance Bank Owned Life Insurance Goodwill Goodwill Other intangible assets Intangible Assets, Net (Excluding Goodwill) Liabilities and Shareholders’ equity Deposits Deposits Disposal Group, Including Discontinued Operation, Liabilities Disposal Group, Including Discontinued Operation, Liabilities Borrowed funds Advances by borrowers for taxes and insurance Advance Payments by Borrowers for Taxes and Insurance Accrued interest payable Interest Payable Shareholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.01 par value: 50,000,000 authorized, no shares issued Preferred Stock, Value, Issued Common stock, $0.01 par value: 500,000,000 shares authorized, 101,699,406 and 101,871,737 shares issued, respectively Common Stock, Value, Issued Paid-in capital Additional Paid in Capital, Common Stock Retained earnings Retained Earnings (Accumulated Deficit) Unallocated common stock of employee stock ownership plan Unallocated Common Stock of Employee Stock Ownership Plan Unallocated Common Stock Held By ESOP. Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total shareholders' equity Business Segments Segment Reporting Disclosure [Text Block] Property, Plant and Equipment [Abstract] Schedule of premises and equipment Property, Plant and Equipment [Table Text Block] Schedule of minimum annual rentals Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Debt securities Debt Securities [Member] Other Other Securities [Member] Represents information pertaining to other securities. Accumulated benefit obligation for funded defined benefit pension plan Defined Benefit Plan, Accumulated Benefit Obligation for Funded Defined Benefit Pension Plan For funded defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. Accumulated benefit obligation for unfunded defined benefit pension plan Defined Benefit Plan, Accumulated Benefit Obligation for Unfunded Defined Benefit Pension Plan For unfunded defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. Accumulated benefit obligation in excess of plan assets Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract] Projected benefit obligation Defined Benefit Plan, Benefit Obligation Accumulated benefit obligation Defined Benefit Plan, Accumulated Benefit Obligation Anticipated contribution Anticipated Defined Benefit Plan Contribution The anticipated amount the Company will contribute to the defined benefit plan. Target Allocation of securities, minimum (as a percent) Defined Benefit Plan, Target Plan Asset Allocations Range Minimum Target Allocation of securities, maximum (as a percent) Defined Benefit Plan, Target Plan Asset Allocations Range Maximum Target allocation of any one stock, maximum (as a percent) Defined Benefit Plan, Maximum Target Allocation, Percentage of Assets in Any One Stock Maximum target allocation percentage of investments in any one stock, including the entity's stock to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position. Maximum average maturity of bond portfolio Maximum Average Maturity of Bond Portfolio Represents the maximum average maturity of the defined benefit plans bond portfolio. Weighted average asset allocation of defined benefit plans Defined Benefit Plan, Information about Plan Assets [Abstract] Target Allocation Defined Benefit Plan, Assets, Target Allocations [Abstract] Total (as a percent) Defined Benefit Plan, Actual Plan Asset Allocations Federal Home Loan Banks [Abstract] Federal Home Loan Bank Stock Federal Home Loan Bank Stock Disclosure [Text Block] Represents the entire disclosure pertaining to Federal Home Loan Bank (FHLB) stock. Defined Benefit Plan, Requisite Service Age, Minimum Defined Benefit Plan, Requisite Service Age, Minimum Represents the age at which the plan will begin paying benefits to eligible employees regardless of employment status. Components of net periodic pension cost Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return on Plan Assets Net amortization and deferral Defined Benefit Plan, Net Amortization and Deferral Represents the amount of net amortization and deferral recognized in net periodic benefit cost. Net periodic pension (benefit)/ cost Defined Benefit Plan, Net Periodic Benefit Cost Changes in the defined benefit pension plans’ plan assets and benefit obligations recognized in other comprehensive income Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract] Net loss/ (gain) Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax Prior service cost/ (credit) Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, before Tax Amortization of prior service cost Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax Total recognized in other comprehensive income Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax Total recognized in net periodic pension cost and other comprehensive income/ (loss) Defined Benefit Plan, Net Periodic Benefit Cost and Other Comprehensive Income Adjustments Represents the amount recognized in net periodic pension cost and in other comprehensive income/ (loss). Estimated net loss for the postretirement healthcare benefit plan that will be amortized from accumulated other comprehensive income into net periodic benefit cost over the next year Estimated Net Loss for Postretirement Healthcare Benefit Plan that will be Amortized from AOCI into Net Periodic Benefit Cost Represents the estimated net loss for the postretirement healthcare benefit plan that will be amortized from accumulated other comprehensive income into the net periodic benefit cost. Income Tax Disclosure [Abstract] Valuation allowance for deferred tax assets Deferred Tax Assets, Valuation Allowance Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Domestic Tax Authority Domestic Tax Authority [Member] State and Local Jurisdiction State and Local Jurisdiction [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] FNFG First Niagara Financial Group [Member] First Niagara Financial Group LNB LNB [Member] LNB Operating loss carryforwards Operating Loss Carryforwards [Line Items] Deferred tax liabilities related to acquisition Deferred Tax Assets, Net Unrecognized tax benefits that would impact effective tax rate if recognized Unrecognized Tax Benefits that Would Impact Effective Tax Rate Accrued interest on income taxes expense Unrecognized Tax Benefits, Interest on Income Taxes Expense Accrued amount of payment of interest or penalties Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Income income tax examination, additional tax liability Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority Quarterly Financial Information Disclosure [Abstract] Selected Quarterly Financial Data - Unaudited Quarterly Financial Information [Text Block] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Paid-in Capital Additional Paid-in Capital [Member] Retained Earnings Retained Earnings [Member] Accumulated Other Comprehensive Income/ (Loss) AOCI Attributable to Parent [Member] Unallocated Common Stock of ESOP Unallocated Common Stock Held By E S O P [Member] This element represents unallocated common stock of ESOP member. Statement Statement [Line Items] Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance at beginning of the period Comprehensive income: Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Net Income Net Income (Loss) Available to Common Stockholders, Basic Other comprehensive loss, net of tax of $234, $8,081, and $559 for the year ended December 31, 2016, 2015 and 2014, respectively Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent ESOP termination Stock Issued During Period, Value, Acquisitions Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Share repurchases Stock Repurchased and Retired During Period, Value Stock-based compensation expense including tax benefits of $332, $945, and $635 for the year ended December 31, 2016, 2015 and 2014, respectively Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Dividends paid ($0.56, $1.62, and $0.50 per share for the year ended December 31, 2016, 2015 and 2014, respectively) Dividends, Cash Balance at end of the period Schedule of selected quarterly financial data Quarterly Financial Information [Table Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest rate swaps Interest Rate Swap [Member] Liability Derivatives, Included in Other Liabilities Derivatives, Fair Value [Line Items] Fair value Derivative Liability, Fair Value, Gross Liability Notional amount Derivative Liability, Notional Amount Collateral posted Collateral Already Posted, Aggregate Fair Value Accounting Changes and Error Corrections [Abstract] Recent Accounting Pronouncements New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Defined Contribution Plan [Table] Defined Contribution Plan [Table] Defined Contribution Plan Type [Axis] Defined Contribution Plan Type [Axis] Defined Contribution Plan Type [Domain] Defined Contribution Plan Type [Domain] Defined Contribution Plan Disclosure [Line Items] Defined Contribution Plan Disclosure [Line Items] Employer matching contribution Employer Matching Contribution of Employees Contribution for Retirement Savings Plan This element represents the percentage of employees' contribution that the employer matches for the applicable employees contribution. Employee matching contribution Retirement Savings Plan Annual Contribution Per Employee Percentage Represents the maximum percentage of the employees' contribution to the retirement savings plan (401k) that will be matched by the Company. Total expense for all retirement plans Pension and Other Postretirement Benefit Expense Estimated net loss and prior service cost that will be amortized from accumulated other comprehensive income into net periodic cost over the next year Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year [Abstract] Estimated net loss that will be amortized from accumulated other comprehensive income into net periodic cost over the next year Defined Benefit Plan, Future Amortization of Gain (Loss) Prior service credit that will be amortized from accumulated other comprehensive income into net periodic cost over the next year Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit) Change in benefit obligation: Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Benefit obligation at beginning of year Acquisition Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation Actuarial loss Defined Benefit Plan, Actuarial Gain (Loss) Benefits paid Defined Benefit Plan, Benefits Paid Benefit obligation at end of year Change in plan assets: Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Fair value of plan assets at beginning of year Actual return on plan assets Defined Benefit Plan, Actual Return on Plan Assets Employer contributions Defined Benefit Plan, Contributions by Employer Acquisition Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets Fair value of plan assets at end of period Funded status at end of year Defined Benefit Plan, Funded Status of Plan Assumptions used to develop the net periodic pension cost Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Discount rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Expected long-term rate of return on assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets Rate of increase in compensation levels Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Monthly cost of healthcare insurance per beneficiary Defined Benefit Plan Monthly Cost of Healthcare Insurance Per Beneficiary Represents the amount of monthly cost of healthcare insurance per beneficiary. Assumptions used to determine benefit obligations Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Expected long-term rate of return on assets Defined Benefit Plan, Assumptions Used in Calculating Benefit Obligation Expected Long Term Return on Assets An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested, which is used to determine benefit obligations. Rate of increase in compensation levels Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Stockholders' Equity Note [Abstract] Bad debt deductions for which no deferred income taxes have been provided Bad Debt Deduction for which No Deferred Taxes have been Provided Cumulative amount of bad debt deductions net of losses absorbed included in retained earnings as of the balance sheet date for which no deferred income taxes have been provided based on the Internal Revenue Code (IRC) rules. Parent Company Only Financial Statements - Condensed Condensed Financial Information of Parent Company Only Disclosure [Text Block] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Financing Receivable, Modifications [Line Items] Financing Receivable, Modifications [Line Items] Number of contracts Financing Receivable, Modifications, Number of Contracts Recorded investment at the time of modification Financing Receivable, Modifications, Pre-Modification Recorded Investment Current recorded investment Financing Receivable, Modifications, Post-Modification Recorded Investment Current allowance Financing Receivable, Modification Allowance for Credit Losses The reserve to cover probable credit losses related to financing receivables that have been modified by troubled debt restructurings during the reporting period. Troubled debt restructurings that subsequently defaulted: Financing Receivable Modifications that Subsequently Defaulted [Abstract] Number of contracts Financing Receivable, Modifications, Subsequent Default, Number of Contracts Recorded investment at the time of modification Financing Receivable Modification that Subsequently Defaulted Pre-Modification Recorded Investment Pre-modification amount of outstanding recorded investment related to financing receivables (as of the balance sheet date) that have been modified by troubled debt restructurings and then subsequently defaulted during the reporting period. Current recorded investment Financing Receivable, Modifications, Subsequent Default, Recorded Investment Current allowance Increase (Decrease) in Financing Receivable Modifications Recorded Investment Reserve The increase decrease in the amount of allowance for credit losses related to receivables which had been measured under a general allowance for credit losses methodology that are now identified as troubled debt restructurings. Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Acquired loans evaluated collectively for future credit losses Acquired Loans Evaluated Collectively For Future Credit Losses [Member] Represents acquired loans evaluated collectively for future credit losses. Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Carrying value Impaired Financing Receivable Carrying Value The amount of impaired financing receivable at carrying value. Total loans receivable, gross Loans and Leases Receivable, Gross Deferred loan costs Loans and Leases Receivable, Deferred Income Allowance for loan losses Loans and Leases Receivable, Allowance Undisbursed loan proceeds Loans and Leases Receivable, Loans in Process Loans Receivable, Net Employee Benefit Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Fair Value Disclosures [Abstract] Fair Value Inputs, Assets, Quantitative Information [Table] Fair Value Inputs, Assets, Quantitative Information [Table] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Loans evaluated for impairment Impaired Loans [Member] Represents information pertaining to impaired loans. Real estate owned Other Real Estate Owned [Member] Represents information pertaining to real estate owned, comprising of property acquired through foreclosure or voluntarily conveyed by delinquent borrowers. Mortgage servicing rights Mortgage Servicing Rights [Member] Mortgage Servicing Rights [Member] Valuation Technique [Axis] Valuation Technique [Axis] Valuation Technique [Domain] Valuation Technique [Domain] Discounted cash flow Discounted Cash Flow Valuation Technique [Member] Represents the discounted cash flow technique used to measure fair value. Appraisal Value Appraisal Value [Member] Appraisal Value Weighted Average Weighted Average [Member] Quantitative information for Level 3 Fair Value Measurements Assets Fair Value Inputs, Assets, Quantitative Information [Line Items] Fair value Assets, Fair Value Disclosure Discount margin Fair Value Inputs Discount Margin Represents the interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. Default rates Fair Value Inputs Default Rate Represents the default rate, used as an input to measure fair value. Prepayment speeds / rate Fair Value Inputs, Prepayment Rate Expected life (in months), minimum Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Expected Life, Minimum Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Expected Life, Minimum Expected life (in months) maximum Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Weighted Average Life Expected life (in months), weighted average Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Expected Life, Maximum Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Expected Life, Maximum Estimated costs to sell Fair Value Inputs Estimated Costs to Sell Represents the estimated selling costs used as an input to measure fair value. Discount rate Fair Value Inputs, Discount Rate Annual service cost Fair Value Inputs, Annual Service Cost Fair Value Inputs, Annual Service Cost Option adjusted spread Fair Value Inputs, Basis Spread on Variable Rate Fair Value Inputs, Basis Spread on Variable Rate Forward yield curve Fair Value Inputs, Forward Yield Curve Fair Value Inputs, Forward Yield Curve Recorded investment in loans receivable Allowance for loan losses Loans and Leases Receivable Allowance Excluding Unallocated The allowance for loan and lease losses represents the reserve to cover probable credit losses related to all loans and leases, as well as probable credit losses inherent in the remainder of the loan portfolio as of the balance sheet date excluding unallocated amounts. Recorded investment in loans on nonaccrual Financing Receivable, Recorded Investment, Nonaccrual Status Recorded investment in loans 90 days or more past maturity and still accruing Financing Receivable, Recorded Investment, 90 Days Or More Past Maturity And Still Accruing Financing Receivable, Recorded Investment, 90 Days Or More Past Maturity And Still Accruing TDRs Financing Receivable, Modifications, Recorded Investment Allowance for TDRs Allowance for Credit Losses, Change in Method of Calculating Impairment Additional commitments to customers with loans classified as TDRs Financing Receivable, Modifications, Recorded Investment Additional Commitment The amount of additional commitments to lend to customers who have financing receivables that have been modified by troubled debt restructurings. Nonaccrual TDRs Financing Receivable, Modifications, Recorded Investment, NonAccrual The non-accruing portion of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. Interest Receivable and Other Assets [Abstract] Accrued Interest Receivable Accrued Interest Receivable Disclosure [Text Block] Represents the entire disclosure pertaining to accrued interest receivable. Business Combinations [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Core Deposits Core Deposits [Member] Customer Relationships Customer Relationships [Member] Northwest Bank Subsidiaries [Member] First Niagara Bank, National Association and First Niagara Securities, Inc. First Niagara Bank, National Association and First Niagara Securities, Inc. [Member] First Niagara Bank, National Association and First Niagara Securities, Inc. Business Acquisition [Line Items] Business Acquisition [Line Items] Number of branch locations acquired Number of Branch Locations Acquired The number of branch locations acquired by the entity during the period. Assets under management, carrying amount Assets under Management, Carrying Amount Deposit premium paid Other Payments to Acquire Businesses Recognized amounts of identifiable assets acquired and (liabilities assumed), at fair value Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] Cash and cash equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Loans Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Loans Receivable Represents the amount of loans receivable acquired at the acquisition date. Core deposit intangible Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Total assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Deposits Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits Liabilities Other liabilities Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities Amount of other liabilities assumed at the acquisition date Total liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Goodwill Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Useful life of core deposit intangibles Finite-Lived Intangible Asset, Useful Life Business combination, acquisition costs expensed Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed Schedule of allocation of income tax Schedule of Income Tax Expense Allocation [Table Text Block] Tabular disclosure of allocation of income tax expense benefit. Schedule of income tax expense (benefit) applicable to income before taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of reconciliation of the expected federal statutory rate to the effective rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Deposits [Abstract] Deposits Deposit Liabilities Disclosures [Text Block] Schedule of the portfolio of investment securities available-for-sale Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Schedule of the portfolio of investment securities held-to-maturity Held-to-maturity Securities [Table Text Block] Information regarding the issuers and the carrying values of the entity's mortgage-backed securities Mortgage Backed Securities [Table Text Block] Tabular disclosure of mortgage-backed securities. Schedule of the fair value and gross unrealized losses on investment securities, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position Schedule of Unrealized Loss on Investments [Table Text Block] Schedule of categories of investment securities on which other-than-temporary impairment charges have been recorded in earnings Schedule of Temporary Impairment Losses Investments Recognized in Earnings [Table Text Block] Tabular disclosure of investments for which other-than-temporary impairments have been recognized in earnings. Schedule of the cumulative roll forward of credit related impairment losses recognized in earnings for debt securities held and not intended to be sold Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block] Schedule of liability derivatives included in other liabilities Schedule of Derivative Liabilities at Fair Value [Table Text Block] Summary of guaranteed capital debt securities and junior subordinated deferrable interest debentures held by the trusts Schedule of Capital Debt Securities and Junior Subordinated Deferrable Interest Debentures [Table Text Block] Tabular disclosure of capital debt and junior subordinated deferrable interest debentures. Disclosures About Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Unrealized gain on marketable securities available-for-sale Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Fair value of interest rate swaps Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Defined benefit pension plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Accumulated other comprehensive income Accumulated other comprehensive income (net of tax) Accumulated Other Comprehensive Income (Loss) [Line Items] Reclassification adjustment for gains (losses) on securities, net of tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Income tax (expense) benefit related to (gain) loss on securities Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Amortization of prior service cost (compensation and employee benefits) Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Net of Tax Amortization of net loss (compensation and employee benefits) Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Net of Tax Income tax expense (benefit) related to compensation and employee benefits Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Tax Changes in accumulated other comprehensive income by component AOCI Attributable to Parent, Net of Tax [Roll Forward] Other comprehensive income/ (loss) before reclassification adjustments Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Amounts reclassified from accumulated other comprehensive income (1), (2) Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Other comprehensive loss Commitments and Contingencies Disclosure [Abstract] Contingent Liabilities Commitments and Contingencies Disclosure [Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Goodwill [Table] Schedule of Goodwill [Table] LNB LNB Trust I And LNB Trust II [Member] LNB Trust I And LNB Trust II [Member] Petruso Insurance Agency Petruso Insurance Agency [Member] Petruso Insurance Agency FNFG Best Insurance Agency Best Insurance Agency [Member] Best Insurance Agency Winan Insurance Agency Winan Insurance Agency [Member] Winan Insurance Agency [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Community Banks Community Banking [Member] Represents information pertaining to community banking. Consumer Finance Consumer Finance [Member] Represents information pertaining to consumer finance. Goodwill Goodwill [Line Items] Goodwill impaired Goodwill, Impaired, Accumulated Impairment Loss Changes in the carrying amount of goodwill Goodwill [Roll Forward] Balance at the beginning of the period Goodwill acquired Goodwill, Acquired During Period Balance at the end of the period Regulatory Capital Requirements Regulatory Capital Requirements under Banking Regulations [Text Block] Premises and Equipment Property, Plant and Equipment Disclosure [Text Block] Investment Issuer [Axis] Investment Issuer [Axis] Investment Issuer [Domain] Investment Issuer [Domain] FNMA Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] GNMA Government National Mortgage Association Certificates and Obligations (GNMA) [Member] FHLMC Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] SBA Mortgage Backed Securities Issued By Small Business Administration [Member] Represents information pertaining to mortgage-backed securities issued by Small Business Administration. Other (including non-agency) Other Investment Companies [Member] Total residential mortgage-backed securities Marketable Securities Carrying value of marketable securities pledged Security Owned and Pledged as Collateral, Fair Value Marketable securities classified as available-for-sale sold Proceeds from Sale of Available-for-sale Securities Gross realized gains Available-for-sale Securities, Gross Realized Gains Gross realized losses Available-for-sale Securities, Gross Realized Losses Non-cash credit related other-than-temporary impairment Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net Troubled debt restructurings Number of contract Financing Receivable Modifications Number of Contract [Roll Forward] Beginning balance Financing Receivable Modifications, Outstanding Number Of Contracts Financing Receivable Modifications, Outstanding Number Of Contracts Number of contracts new TDRs Financing Receivable Modifications Number Of Contracts 2 Additions Number additions during the period of financing receivables that have been modified by troubled debt restructurings. Number of re-modified TDRs Financing Receivable, Modifications, Number of Contracts remodified Number of financing receivables that have been re-modified by troubled debt restructurings. Number of contracts charged off Financing Receivable Modifications Number of Contracts Charged Off The number of financing receivables that have been modified by troubled debt restructurings and were charged off during the reporting period. Number of contracts paid off Financing Receivable Modifications, Number of Contracts Paid-off The number of financing receivables that have been modified by troubled debt restructurings and were paid off during the reporting period. Number of contracts transferred to real estate owned Financing Receivable Modifications, Number of Contracts Transferred Represents the number of financing receivables that have been modified by troubled debt restructurings and transferred to real estate owned. Ending balance Roll forward of troubled debt restructurings Financing Receivable, Modifications, Recorded Investment [Roll Forward] A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. Beginning TDR balance: New TDRs Financing Receivable, Modifications, Recorded Investment Additions The amount of additions during the period in recorded investment related to financing receivables that has been modified by troubled debt restructurings. Re-modified TDRs Financing Receivable Modifications Recorded Investment Re-modifications The amount of the recorded investment related to existing financing receivables that were previously modified by troubled debt restructurings and have subsequently been re-modified during the period. Net paydowns Financing Receivable, Modifications, Recorded Investment Net Paydowns The amount of net paydowns out of recorded investment related to financing receivables that have been modified by troubled debt restructurings. Amount of contracts charged off Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down Amount of contracts paid off Financing Receivable Modifications, Amount Paid-off The amount of financing receivables that have been modified by troubled debt restructurings and were paid off during the reporting period. Transferred to real estate owned Financing Receivable Modifications Recorded Investment Transfers The amount of transfers out of recorded investment related to financing receivables that have been modified by troubled debt restructurings. Ending TDR balance: Accruing TDRs Financing Receivable, Modifications Recorded Investment, Accrual The accruing portion of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. Non-accrual TDRs Organization, Consolidation and Presentation of Financial Statements [Abstract] Summary of Significant Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Stock options Employee Stock Option [Member] Schedule of net periodic costs for the defined benefit pension plans and the post retirement healthcare plans Schedule of Net Benefit Costs [Table Text Block] Schedule of other changes in the defined benefit pension plans' plan assets and benefit obligations recognized in other comprehensive income Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] Schedule of defined benefit pension plans' funded status Schedule of Net Funded Status [Table Text Block] Schedule of assumptions used to develop the net periodic pension cost Schedule of Assumptions Used in Calculating Net Periodic Benefit Cost [Table Text Block] Tabular disclosure of the assumptions used to determine the net benefit cost for pension plans and/or other employee benefit plans, including assumed discount rates, monthly cost per beneficiary and annual increase in healthcare costs. Schedule of assumptions used to determine benefit obligations Schedule of Assumptions Used in Calculating Benefit Obligation [Table Text Block] Tabular disclosure of the assumptions used to determine the benefit obligation for pension plans and/or postretirement benefit plans, including assumed discount rates, rate increase in compensation and expected long-term rates of return on plan assets. Schedule of certain information related to pension plans Schedule of Projected Benefit Obligation Accumulated Benefit Obligation and Fair Value of Plan Assets [Table Text Block] Tabular disclosure of the projected benefit obligation, accumulated benefit obligation and fair value of plan assets of defined benefit plans of the reporting entity. Schedule of weighted average asset allocation of defined benefit plans Schedule of Allocation of Plan Assets [Table Text Block] Schedule of allocation of plan assets Schedule of Fair Value of Plan Assets [Table Text Block] Tabular disclosure of the fair value of each major category of plan assets. Schedule of accumulated benefit obligation in excess of plan assets Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block] Schedule of activity under option plans Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of number of options outstanding, number of options exercisable, and weighted average remaining life of all option grants Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans by Exercise Price [Table Text Block] Tabular disclosure of option exercise prices including the number of shares outstanding and exercisable and the remaining contractual option terms. Statement of Cash Flows [Abstract] Operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Provision for loan losses Provision for Loan and Lease Losses Net gain on sale of assets Gain (Loss) on Disposition of Assets for Financial Service Operations Net depreciation, amortization and accretion Depreciation, Amortization and Accretion, Net Decrease in other assets Increase (Decrease) in Other Operating Assets Increase/ (decrease) in other liabilities Increase (Decrease) in Other Operating Liabilities Net amortization of premium on marketable securities Accretion (Amortization) of Discounts and Premiums, Investments Noncash compensation expense related to stock benefit plans Share-based Compensation Noncash impairment of real estate owned Impairment of Real Estate Deferred income tax expense Deferred Income Tax Expense (Benefit) FHLB prepayment penalty Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Repayment and Penalties, Cash Portion Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Repayment and Penalties, Cash Portion Origination of loans held for sale Payments for Origination and Purchases of Loans Held-for-sale Proceeds from sale of loans held for sale Proceeds from Sale of Loans Held-for-sale Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Investing activities: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Purchase of marketable securities available-for-sale Payments to Acquire Available-for-sale Securities Proceeds from maturities and principal reductions of marketable securities held-to-maturity Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Proceeds from maturities and principal reductions of marketable securities available-for-sale Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Proceeds from sale of marketable securities available-for-sale Loan originations Originations of Loans Receivable Held for Investment The cash outflow associated with loans originated and held for investment purposes during the period. Proceeds from loan maturities and principal reductions Proceeds from Principal Repayments on Loans and Leases Held-for-investment (Purchases)/ redemptions of Federal Home Loan Bank stock Payments for (Proceeds from) Federal Home Loan Bank Stock Proceeds from sale of real estate owned Proceeds from Sale of Foreclosed Assets Sale of real estate owned for investment, net Proceeds from Sale of Real Estate Held-for-investment Purchases of premises and equipment Payments to Acquire Property, Plant, and Equipment Acquisitions, net of cash received Payments to Acquire Businesses, Net of Cash Acquired Net cash provided by/ (used in) investing activities Net Cash Provided by (Used in) Investing Activities Financing activities: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Decrease in deposits, net Increase (Decrease) in Deposits Proceeds from long-term borrowings Proceeds from Issuance of Long-term Debt Repayments of long-term borrowings Repayments of Long-term Debt Net increase/ (decrease) in short-term borrowings Proceeds from (Repayments of) Short-term Debt Increase/ (decrease) in advances by borrowers for taxes and insurance Increase (Decrease) in Advances by Borrowers for Taxes and Insurance This element represent as Increase/ (decrease) in advances by borrowers for taxes and insurance. Redemption of Junior subordinated debentures Repayments of Subordinated Debt Share repurchases Payments for Repurchase of Common Stock Cash dividends paid on common stock Payments of Dividends Proceeds from stock options exercised Proceeds from Stock Options Exercised Excess tax benefit from stock-based compensation Excess Tax Benefit from Share-based Compensation, Financing Activities Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Net increase/ (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Net decrease in cash and cash equivalents Cash and cash equivalents at end of period Cash and cash equivalents: Cash and Cash Equivalents, at Carrying Value [Abstract] Total cash and cash equivalents Cash paid during the period for: Cash Paid During Period for [Abstract] Interest on deposits and borrowings (including interest credited to deposit accounts of $22,213, $21,949 and $22,783, respectively) Cash Paid for Interest on Deposits and Borrowings This element represents the interest paid on deposits and borrowings during the reporting period. Income taxes Income Taxes Paid Noncash activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Business acquisitions: Business Acquisitions [Abstract] Fair value of assets acquired Noncash or Part Noncash Acquisition, Value of Assets Acquired Net cash (paid)/ received Liabilities assumed Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed) Loan foreclosures and repossessions Transfer of Other Real Estate and Other Repossessed Personal Property Value of real estate and repossessed personal property transferred in noncash transactions during the reporting period. Sale of real estate owned financed by the Company Sale and Financing of Other Real Estate Owned Loans originated by the Company to finance the sale of OREO. Investment securities Accrued Interest Receivable on Investments Amounts due for interest earned on investment securities but not received as of the balance sheet date. Mortgage-backed securities Accrued Interest Receivable on Mortgage Backed Securities Amounts due for interest earned on mortgage-backed securities but not received as of the balance sheet date. Loans receivable Accrued Interest Receivable on Loans Amounts due for interest earned on loans but not received as of the balance sheet date. Accrued interest receivable Significant unrealized appreciation or depreciation in financial instruments Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Financial Instruments Total Unrealized Gains (Losses) Period Increase (Decrease) The increase (decrease) of financial instruments measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. Such increase (decrease) may be comprised of changes in fair value (gains or losses) unrealized. Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Carrying amount Reported Value Measurement [Member] Estimated fair value Estimate of Fair Value Measurement [Member] Level 1 Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Carrying amount and estimated fair value of the entity's financial instruments included in the consolidated statement of financial condition Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Financial assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Securities available-for-sale Securities held-to-maturity Loans receivable, net Loans Receivable, Fair Value Disclosure FHLB Stock Investment in Federal Home Loan Bank Stock, Fair Value Disclosure Total assets and liabilities Financial liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Savings and checking accounts Savings and Demand Deposits The carrying amount of savings and demand deposits as of the balance sheet date. Time deposits Deposits, Fair Value Disclosure Junior subordinated debentures Cash flow hedges - swaps Derivative Liability Accrued interest payable Accrued Liabilities, Fair Value Disclosure Total financial liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Assets transferred between Level 1 and Level 2 Fair Value Assets Amount Transfers between Level 1 and Level 2 Amount of transfer of assets measured on a recurring basis between Level 1 and Level 2 of the fair value hierarchy. Nature of Operations Nature of Operations [Abstract] Number of banking locations Number of Banking Locations Represents the number of banking locations in which the entity operates. Number of consumer finance offices Number of Consumer Finance Offices Represents the number of consumer finance offices through which the entity offers its products. Investment Securities Marketable Securities [Abstract] Securities classified as trading Trading Securities Loans Receivable Number of days in delinquency for accrued interest on loans to be considered for reversal, minimum Financing Receivable Number of Days Delinquency for Accrued Interest on Loans to be Considered Reversal Represents the number of days delinquent for accrued interest on loans to be considered reversed. Number of days delinquent for loans to be placed on non-accrual status, minimum Financing Receivable Number of Days Delinquent for Loans to be Placed on Nonaccrual Status Represents the number of days delinquent for loans to be placed on non-accrual status. Period of time to return TDRs included in impaired loans to performing status through the fulfilling of contractual terms Period to Return Troubled Debt Restructured Loans Included in Non-performing Loans to Performing Status Represents the period of time to return TDRs included in non-performing loans to performing status through the fulfilling of contractual terms. Allowance for Loan Losses and Provision for Loan Losses Allowance for Loan and Lease Losses Write-offs, Net [Abstract] Number of days for loans not deemed to be impaired Financing Receivable Number of Days for Loans Not Deemed to be Impaired Represents the number of days for loans not deemed to be impaired. Financing receivable, individually evaluated for impairment, threshold amount for analysis Financing Receivable, Individually Evaluated For Impairment, Threshold Amount For Analysis Financing Receivable, Individually Evaluated For Impairment, Threshold Amount For Analysis Actual losses incurred through average number of rolling years Financing Receivable Number of Rolling Year Average of Actual Losses Incurred Represents the number of rolling years considered for the average actual losses incurred. Number of days delinquent for allowance for loans Financing Receivable Number of Days Delinquent for Allowance for Loans Represents the number of days delinquent for an allowance for loans. Number of days delinquent for loans to be charged off or charged down unless that borrower has filed for bankruptcy Allowance for Loan and Lease Losses Number of Days Delinquent for Loans to be Charged Off or Charged Down Represents the number of days delinquent for loans to be charged-off or charged down, unless that borrower has filed for bankruptcy. Residential mortgage loans classified as held-for-sale Mortgages Held-for-sale, Fair Value Disclosure Minimum annual rentals Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2017 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2018 Operating Leases, Future Minimum Payments, Due in Two Years 2019 Operating Leases, Future Minimum Payments, Due in Three Years 2020 Operating Leases, Future Minimum Payments, Due in Four Years 2021 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total Operating Leases, Future Minimum Payments Due Rental expense Operating Leases, Rent Expense Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Northwest Bancshares, Inc. Northwest Bancshares Inc [Member] Represents the information pertaining to Northwest Bancshares, Inc. that was incorporated by the entity. Regulatory Capital Requirements Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Total capital (to risk weighted assets) Capital [Abstract] Actual amount Capital Actual ratio (as a percent) Capital to Risk Weighted Assets Capital required for capital adequacy Capital Required for Capital Adequacy Minimum capital requirements amount Capital Required To Be Well Capitalized, Capital Conservation Buffer Capital Required To Be Well Capitalized, Capital Conservation Buffer Minimum capital requirements ratio (as a percent) Capital Required for Capital Adequacy to Risk Weighted Assets Well capitalized requirements amount Capital Required to be Well Capitalized Well capitalized requirements ratio (as a percent) Capital Required to be Well Capitalized to Risk Weighted Assets Tier 1 capital (to risk weighted assets) Tier One Risk Based Capital [Abstract] Actual amount Tier One Risk Based Capital Actual ratio (as a percent) Tier One Risk Based Capital to Risk Weighted Assets Minimum capital requirements amount Tier One Risk Based Capital Required for Capital Adequacy Minimum capital requirements ratio (as a percent) Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Well capitalized requirements amount Tier One Risk Based Capital Required to be Well Capitalized Well capitalized requirements ratio (as a percent) Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets CET 1 capital (to risk weighted assets) Common Equity Tier 1 Risk Based Capital [Abstract] Common Equity Tier 1 Risk Based Capital [Abstract] Actual amount Common Equity Tier 1 Risk Based Capital Common Equity Tier 1 Risk Based Capital Actual ratio (as a percent) Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Minimum capital requirements amount Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Minimum capital requirements ratio (as a percent) Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Well capitalized requirements amount Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Well capitalized requirements ratio (as a percent) Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Tier 1 capital (leverage) (to average assets) Tier One Leverage Capital [Abstract] Actual amount Tier One Leverage Capital Actual ratio (as a percent) Tier One Leverage Capital to Average Assets Minimum capital requirements amount Tier One Leverage Capital Required for Capital Adequacy Minimum capital requirements ratio (as a percent) Tier One Leverage Capital Required for Capital Adequacy to Average Assets Well capitalized requirements amount Tier One Leverage Capital Required to be Well Capitalized Well capitalized requirements ratio (as a percent) Tier One Leverage Capital Required to be Well Capitalized to Average Assets Subsequent Events [Abstract] Subsequent Events - Unaudited Subsequent Events [Text Block] Guaranteed Preferred Beneficial Interests in Company’s Junior Subordinated Deferrable Interest Debentures (Trust-Preferred Securities) and Interest Rate Swap Agreements Trust Preferred Securities and Derivatives Disclosure [Text Block] This element represent as Guaranteed Preferred Beneficial Interests in Company's Junior Subordinated Deferrable Interest Debentures (Trust-Preferred Securities) and Interest Rate Swap Agreements. Schedule of the components of accumulated other comprehensive income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of the changes in accumulated other comprehensive income by component Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component [Table Text Block] Tabular disclosure of the changes in accumulated other comprehensive income by component. Cumulative roll forward of credit related impairment losses recognized in earnings for debt securities held and not intended to be sold: Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] Beginning balance Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held Credit losses on debt securities for which other-than-temporary impairment was not previously recognized Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment Reduction for losses realized during the year Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold Reduction for securities called realized during the year Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Called This item represents reductions in the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security because of the exercise of a call option of impaired securities during the period. Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses Ending balance Number of reportable business segments Number of Reportable Segments Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] All Other Other Segments [Member] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Intersegment Intersegment Eliminations [Member] Business Segments Segment Reporting Information [Line Items] Interest income Interest and Dividend Income, Operating Interest expense Interest Expense Noninterest income Noninterest Income Noninterest expense Noninterest Expense Income tax expense/ (benefit) Income Tax Expense (Benefit) Net income Total assets Marketable securities available-for-sale, amortized cost Available-for-sale Securities, Amortized Cost Basis Marketable securities held-to-maturity, fair value Allowance for loan losses Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued 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, shares issued Common Stock, Shares, Issued Loans Receivable and Allowance for Loan Losses Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Interest on deposits and borrowings, interest credited to deposit accounts Cash Paid for Interest on Deposits This element represents interest paid to depositors on deposit accounts held by the institution. Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Unallocated Unallocated Financing Receivables [Member] Allowance for loan losses Financing Receivable, Allowance for Credit Losses [Line Items] Changes in allowance for losses on allocated loans receivable Allowance for Loan and Lease Losses [Roll Forward] Balance at the beginning of the period Provision Charge-offs Allowance for Loan and Lease Losses, Write-offs Recoveries Allowance for Loan and Lease Loss, Recovery of Bad Debts Balance at the end of the period Borrowed Funds Borrowed Funds [Text Block] The entire disclosure for borrowings by the entity for both short and long term borrowings which includes information related to balance outstanding, interest rate and maturity date. Fair Value Measurements, Recurring and Nonrecurring [Table]