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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 9 false 5 2 fnfg_InterestAndDividendIncomeOther fnfg false credit duration Interest and dividend income on all securities. Also includes all other interest income, net of discount accretion and... false false false false false false false false false false false totallabel false 1 false true false false 61565000 61565 false false false 2 false true false false 23967000 23967 false false false 3 false true false false 109488000 109488 false false false 4 false true false false 42727000 42727 false false false xbrli:monetaryItemType monetary Interest and dividend income on all securities. Also includes all other interest income, net of discount accretion and premium amortization, and dividend income. It may include dividend income from equity securities that do not have readily determinable fair values that are reportable in Other Assets. No authoritative reference available. true 6 2 us-gaap_InterestAndDividendIncomeOperating us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 195129000 195129 false false false 2 false true false false 110794000 110794 false false false 3 false true false false 339632000 339632 false false false 4 false true false false 216613000 216613 false false false xbrli:monetaryItemType monetary Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Chapter 4 -Paragraph 9, 51, 54 -IssueDate 2006-05-01 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1, 2 , 3, 4, 5 -Article 9 false 7 1 us-gaap_InterestExpenseAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 8 2 us-gaap_InterestExpenseDeposits us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 20698000 20698 false false false 2 false true false false 18980000 18980 false false false 3 false true false false 35081000 35081 false false false 4 false true false false 39893000 39893 false false false xbrli:monetaryItemType monetary Aggregate amount of interest expense on all deposits. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 8 -Subsection I true 10 2 us-gaap_InterestExpense us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 40371000 40371 false false false 2 false true false false 30849000 30849 false false false 3 false true false false 70705000 70705 false false false 4 false true false false 64038000 64038 false false false xbrli:monetaryItemType monetary The cost of borrowed funds accounted for as interest that was charged against earnings during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 9 -Subsection II Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 true 11 1 us-gaap_InterestIncomeExpenseNet us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 154758000 154758 false false false 2 false true false false 79945000 79945 false false false 3 false true false false 268927000 268927 false false false 4 false true false false 152575000 152575 false false false xbrli:monetaryItemType monetary Amount of net interest income or expense derived from banking operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 10 -Article 9 false 12 1 us-gaap_ProvisionForLoanAndLeaseLosses us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 11000000 11000 false false false 2 false true false false 8900000 8900 false false false 3 false true false false 24131000 24131 false false false 4 false true false false 17650000 17650 false false false xbrli:monetaryItemType monetary The sum of the periodic provision charged to operations, based on an assessment of the uncollectibility of the loan and lease portfolio, the offset to which is either added to or deducted from the allowance account for the purpose of reducing loan receivable and leases to an amount that approximates their net realizable value (the amount expected to be collected). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Chapter 5 -Paragraph 168, 169, 170 -IssueDate 2006-05-01 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 true 13 1 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 143758000 143758 false false false 2 false true false false 71045000 71045 false false false 3 false true false false 244796000 244796 false false false 4 false true false false 134925000 134925 false false false xbrli:monetaryItemType monetary Net interest and dividend income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 12 -Article 9 true 14 1 us-gaap_NoninterestIncomeAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 15 2 fnfg_BankingServices fnfg false credit duration Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain... false false false false false false false false false false false verboselabel false 1 false true false false 21529000 21529 false false false 2 false true false false 10053000 10053 false false false 3 false true false false 37536000 37536 false false false 4 false true false false 20023000 20023 false false false xbrli:monetaryItemType monetary Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from nontransaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) use of automated teller machines or remote service units; (9) checks, debit card charges and ATM withdrawals drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (10) issuing stop payment orders; (11) certifying checks; (12)use of internet bill payment services; (13) placing deposits with Promontory Interfinancial Network CDARS program; and (14) health savings accounts application fees. Also includes interchange income from debit card usage; income from sale of checks and pre-loaded Mastercards; and annual rental and service fees for safe deposit boxes. No authoritative reference available. false 16 2 fnfg_InsuranceAndBenefitsConsulting fnfg false credit duration Includes fees paid by our clients as well as commissions, fees, and contingent profit sharing paid by insurance carriers. ... false false false false false false false false false false false verboselabel false 1 false true false false 12768000 12768 false false false 2 false true false false 13164000 13164 false false false 3 false true false false 24931000 24931 false false false 4 false true false false 25712000 25712 false false false xbrli:monetaryItemType monetary Includes fees paid by our clients as well as commissions, fees, and contingent profit sharing paid by insurance carriers. Also includes revenues generated by health and welfare plan consulting, defined contribution plan consulting and administration, defined benefit plan consulting and actuarial valuations, compensation consulting and salary administration, and worksite benefits enrollment and on-going administration. No authoritative reference available. false 17 2 fnfg_WealthManagementServices fnfg false credit duration Includes revenue from managing client funds utilizing various third party investment vehicles including stocks, bonds, mutual... false false false false false false false false false false false verboselabel false 1 false true false false 5711000 5711 false false false 2 false true false false 1834000 1834 false false false 3 false true false false 8959000 8959 false false false 4 false true false false 4052000 4052 false false false xbrli:monetaryItemType monetary Includes revenue from managing client funds utilizing various third party investment vehicles including stocks, bonds, mutual funds, annuities, and other investment products, including individual retirement accounts, education savings plans, and retirement plans. No authoritative reference available. false 18 2 fnfg_LendingAndLeasing fnfg false credit duration The noninterest income derived from mortgage banking activities (fees and commissions), including fees earned from selling... false false false false false false false false false false false verboselabel false 1 false true false false 4136000 4136 false false false 2 false true false false 2240000 2240 false false false 3 false true false false 7412000 7412 false false false 4 false true false false 4224000 4224 false false false xbrli:monetaryItemType monetary The noninterest income derived from mortgage banking activities (fees and commissions), including fees earned from selling and servicing residential mortgages. In addition, includes the adjustment to the carrying value of the rights retained or purchased to service mortgages. These adjustments are made when the estimate of the fair value is changed. Also includes fees related to commercial loans, mortgages, lines of credit and letters of credit as well as credit card fees. No authoritative reference available. false 19 2 us-gaap_BankOwnedLifeInsuranceIncome us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 1976000 1976 false false false 2 false true false false 1321000 1321 false false false 3 false true false false 3200000 3200 false false false 4 false true false false 2630000 2630 false false false xbrli:monetaryItemType monetary Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies. No authoritative reference available. false 20 2 fnfg_OtherOperatingNonInterestIncome fnfg false credit duration Represents principal investment gains and losses and other forms of revenue earned, excluding interest, which is not... false false false false false false false false false false false totallabel false 1 false true false false -70000 -70 false false false 2 false true false false 162000 162 false false false 3 false true false false 960000 960 false false false 4 false true false false 593000 593 false false false xbrli:monetaryItemType monetary Represents principal investment gains and losses and other forms of revenue earned, excluding interest, which is not otherwise specified in the taxonomy. No authoritative reference available. true 21 2 us-gaap_NoninterestIncome us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 46050000 46050 false false false 2 false true false false 28774000 28774 false false false 3 false true false false 82998000 82998 false false false 4 false true false false 57234000 57234 false false false xbrli:monetaryItemType monetary The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 13 -Subsection II Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 9 true 22 1 us-gaap_NoninterestExpenseAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 23 2 us-gaap_LaborAndRelatedExpense us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 64081000 64081 false false false 2 false true false false 35169000 35169 false false false 3 false true false false 112318000 112318 false false false 4 false true false false 68406000 68406 false false false xbrli:monetaryItemType monetary The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including share-based compensation, and pension and other postretirement benefit expense. No authoritative reference available. false 24 2 us-gaap_OccupancyNet us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 13422000 13422 false false false 2 false true false false 5901000 5901 false false false 3 false true false false 23329000 23329 false false false 4 false true false false 12367000 12367 false false false xbrli:monetaryItemType monetary Amount of net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Chapter 4 -Paragraph 62 -IssueDate 2006-05-01 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph d Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 15 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph c false 25 2 fnfg_TechnologyAndCommunications fnfg false debit duration Includes (1) the amount of expense in the period for communications and data processing expense and 2) equipment expense... false false false false false false false false false false false verboselabel false 1 false true false false 11403000 11403 false false false 2 false true false false 5351000 5351 false false false 3 false true false false 20052000 20052 false false false 4 false true false false 10404000 10404 false false false xbrli:monetaryItemType monetary Includes (1) the amount of expense in the period for communications and data processing expense and 2) equipment expense including depreciation, repairs, rentals, and service contract costs. This item also includes equipment purchases which do not qualify for capitalization in accordance with the entity's accounting policy. This item excludes furniture expenses. No authoritative reference available. false 26 2 us-gaap_MarketingAndAdvertisingExpense us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 7691000 7691 false false false 2 false true false false 2581000 2581 false false false 3 false true false false 9223000 9223 false false false 4 false true false false 5113000 5113 false false false xbrli:monetaryItemType monetary The total expense recognized in the period for promotion, public relations, and brand or product advertising. No authoritative reference available. false 27 2 us-gaap_ProfessionalFees us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 4054000 4054 false false false 2 false true false false 1300000 1300 false false false 3 false true false false 6564000 6564 false false false 4 false true false false 2509000 2509 false false false xbrli:monetaryItemType monetary A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer. No authoritative reference available. false 28 2 us-gaap_AmortizationOfIntangibleAssets us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 5311000 5311 false false false 2 false true false false 1847000 1847 false false false 3 false true false false 8558000 8558 false false false 4 false true false false 3738000 3738 false false false xbrli:monetaryItemType monetary The aggregate expense charged against earnings 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 (used in) operations using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) false 29 2 us-gaap_FederalDepositInsuranceCorporationPremiumExpense us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 4959000 4959 false false false 2 false true false false 6980000 6980 false false false 3 false true false false 8422000 8422 false false false 4 false true false false 8479000 8479 false false false xbrli:monetaryItemType monetary The premium paid to the Federal Deposit Insurance Corporation for deposit insurance which is included in noninterest expense. No authoritative reference available. false 30 2 us-gaap_BusinessCombinationAcquisitionRelatedCosts us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 27602000 27602 false false false 2 false true false false 2342000 2342 false false false 3 false true false false 33834000 33834 false false false 4 false true false false 4104000 4104 false false false xbrli:monetaryItemType monetary This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 59 false 31 2 fnfg_CharitableContributions fnfg false debit duration Charitable contributions. false false false false false false false false false false false verboselabel false 1 false true false false 8671000 8671 false false false 2 false true false false 211000 211 false false false 3 false true false false 9009000 9009 false false false 4 false true false false 329000 329 false false false xbrli:monetaryItemType monetary Charitable contributions. No authoritative reference available. false 32 2 us-gaap_OtherNoninterestExpense us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 11009000 11009 false false false 2 false true false false 6403000 6403 false false false 3 false true false false 20076000 20076 false false false 4 false true false false 15783000 15783 false false false xbrli:monetaryItemType monetary Other noninterest expenses that are not separately presented in any other noninterest expense category. No authoritative reference available. true 33 2 us-gaap_NoninterestExpense us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 158203000 158203 false false false 2 false true false false 68085000 68085 false false false 3 false true false false 251385000 251385 false false false 4 false true false false 131232000 131232 false false false xbrli:monetaryItemType monetary Total aggregate amount of all noninterest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 14 -Subsection II Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 14 -Article 9 true 34 1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 31605000 31605 false false false 2 false true false false 31734000 31734 false false false 3 false true false false 76409000 76409 false false false 4 false true false false 60927000 60927 false false false xbrli:monetaryItemType monetary Sum of operating profit and nonoperating income (expense) before income (loss) from equity method investments, income taxes, extraordinary items, cumulative effects of changes in accounting principles, and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1(i) -Article 4 false 35 1 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 11602000 11602 false false false 2 false true false false 10934000 10934 false false false 3 false true false false 27507000 27507 false false false 4 false true false false 21385000 21385 false false false xbrli:monetaryItemType monetary The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b true 36 1 us-gaap_NetIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 20003000 20003 false false false 2 false true false false 20800000 20800 false false false 3 false true false false 48902000 48902 false false false 4 false true false false 39542000 39542 false false false xbrli:monetaryItemType monetary The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 10, 15 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28, 29, 30 false 37 1 us-gaap_PreferredStockDividendsAndOtherAdjustments us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false false false false 0 0 false false false 2 false true false false 9378000 9378 false false false 3 false false false false 0 0 false false false 4 false true false false 12046000 12046 false false false xbrli:monetaryItemType monetary The aggregate value of preferred stock dividends and other adjustments necessary to derive net income apportioned to common stockholders. No authoritative reference available. true 38 1 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 true true false false 20003000 20003 false false false 2 true true false false 11422000 11422 false false false 3 true true false false 48902000 48902 false false false 4 true true false false 27496000 27496 false false false xbrli:monetaryItemType monetary Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). 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