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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (USD $) In Thousands | Common Stock [Member] | Additional Paid-in Capital [Member] | Treasury Stock [Member] Purchase of Common Shares Outstanding [Member] | Treasury Stock [Member] Shares Purchased To Fund Options Exercised [Member] | Treasury Stock [Member] Restricted Stock Awards Repurchased To Satisfy Tax Obligations [Member] | Treasury Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Total
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Balance, beginning of period at Dec. 31, 2013 | $ 315 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 201,902 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | $ (22,053)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 263,743 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (11,375)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Purchases of outstanding shares |  |  | (556)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember / ffic_TreasuryStockRepurchaseAxis = ffic_PurchaseOfCommonSharesOutstandingMember | (478)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember / ffic_TreasuryStockRepurchaseAxis = ffic_SharesPurchasedToFundOptionsExercisedMember | (1,103)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember / ffic_TreasuryStockRepurchaseAxis = ffic_RestrictedStockAwardsRepurchasedToSatisfyTaxObligationsMember |  |  |  |
Change in net unrealized gains on securities available for sale, net of taxes of approximately ($3,293) and ($4,237) for the three months ended March 31, 2015 and 2014, respectively |  |  |  |  |  |  |  | 5,360 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 5,360 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Amortization of actuarial losses, net of taxes of approximately ($133) and ($112) for the three months ended March 31, 2015 and 2014, respectively |  |  |  |  |  |  |  | 63 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (63)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
Amortization of prior service credits, net of taxes of approximately $5 and $8 for the three months ended March 31, 2015 and 2014, respectively) |  |  |  |  |  |  |  | (3)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Net income |  |  |  |  |  |  | 10,296 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 10,296 us-gaap_NetIncomeLoss
Cash dividends declared and paid on common shares ($0.16 and $0.15 per common share for the three months ended March 31, 2015 and 2014, respectively) |  |  |  |  |  |  | (4,513)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Award of common shares released from Employee Benefit Trust (136,114 and 126,650 common shares for the three months ended March 31, 2015 and 2014, respectively) |  | 1,929 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Shares issued upon vesting of restricted stock unit awards |  | 3 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 2,897 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (389)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Issuance upon exercise of stock options |  | 122 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 797 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (44)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 478 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Stock-based compensation activity, net |  | (26)us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Stock-based income tax benefit |  | 675 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Balance, end of period at Mar. 31, 2014 | 315 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 204,605 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (20,496)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 269,093 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (5,955)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 447,562 us-gaap_StockholdersEquity
Balance, beginning of period at Dec. 31, 2014 | 315 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 206,437 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (37,221)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 289,623 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (2,907)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 456,247 us-gaap_StockholdersEquity
Purchases of outstanding shares |  |  | (2,766)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember / ffic_TreasuryStockRepurchaseAxis = ffic_PurchaseOfCommonSharesOutstandingMember | (20)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember / ffic_TreasuryStockRepurchaseAxis = ffic_SharesPurchasedToFundOptionsExercisedMember | (1,110)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember / ffic_TreasuryStockRepurchaseAxis = ffic_RestrictedStockAwardsRepurchasedToSatisfyTaxObligationsMember |  |  |  |
Change in net unrealized gains on securities available for sale, net of taxes of approximately ($3,293) and ($4,237) for the three months ended March 31, 2015 and 2014, respectively |  |  |  |  |  |  |  | 4,332 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 4,332 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Amortization of actuarial losses, net of taxes of approximately ($133) and ($112) for the three months ended March 31, 2015 and 2014, respectively |  |  |  |  |  |  |  | 174 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (174)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
Amortization of prior service credits, net of taxes of approximately $5 and $8 for the three months ended March 31, 2015 and 2014, respectively) |  |  |  |  |  |  |  | (6)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Net income |  |  |  |  |  |  | 8,733 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 8,733 us-gaap_NetIncomeLoss
Cash dividends declared and paid on common shares ($0.16 and $0.15 per common share for the three months ended March 31, 2015 and 2014, respectively) |  |  |  |  |  |  | (4,722)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Award of common shares released from Employee Benefit Trust (136,114 and 126,650 common shares for the three months ended March 31, 2015 and 2014, respectively) |  | 1,917 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Shares issued upon vesting of restricted stock unit awards |  | 160 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 3,577 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (503)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Issuance upon exercise of stock options |  | 1 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 19 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | 20 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Stock-based compensation activity, net |  | (465)us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Stock-based income tax benefit |  | 318 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Balance, end of period at Mar. 31, 2015 | $ 315 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 208,368 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | $ (37,521)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 293,131 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 1,593 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 465,886 us-gaap_StockholdersEquity

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Period Type: | duration