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Note 22 - Parent Company Only Financial Information (Details) - Condensed Statements of Cash Flows for the Holding Company: (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating activities: |  |  |
Net income | $ 44,239 us-gaap_NetIncomeLoss | $ 37,752 us-gaap_NetIncomeLoss | $ 34,331 us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Net gain on sale of securities | (2,875)us-gaap_GainLossOnSaleOfSecuritiesNet | (3,021)us-gaap_GainLossOnSaleOfSecuritiesNet | (47)us-gaap_GainLossOnSaleOfSecuritiesNet
Deferred income tax (benefit) provision | 4,154 us-gaap_DeferredIncomeTaxExpenseBenefit | (682)us-gaap_DeferredIncomeTaxExpenseBenefit | (804)us-gaap_DeferredIncomeTaxExpenseBenefit
Fair value adjustments for financial assets and financial liabilities | 2,568 us-gaap_FairValueOptionChangesInFairValueGainLoss1 | 2,521 us-gaap_FairValueOptionChangesInFairValueGainLoss1 | (55)us-gaap_FairValueOptionChangesInFairValueGainLoss1
Stock based compensation expense | 4,263 us-gaap_ShareBasedCompensation | 3,412 us-gaap_ShareBasedCompensation | 3,260 us-gaap_ShareBasedCompensation
Net cash provided by operating activities | 57,376 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 74,435 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 71,097 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Investing activities: |  |  |
Purchases of securities available for sale | (162,830)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (458,596)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (311,654)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Proceeds from sales and calls of securities available for sale | 115,294 ffic_ProceedsFromSalesAndCallsOfAvailableForSaleSecurities | 194,009 ffic_ProceedsFromSalesAndCallsOfAvailableForSaleSecurities | 12,637 ffic_ProceedsFromSalesAndCallsOfAvailableForSaleSecurities
Net cash provided by (used in) investing activities | (339,576)us-gaap_NetCashProvidedByUsedInInvestingActivities | (326,024)us-gaap_NetCashProvidedByUsedInInvestingActivities | (197,988)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing activities: |  |  |
Purchase of treasury stock | (18,872)us-gaap_PaymentsForRepurchaseOfCommonStock | (14,151)us-gaap_PaymentsForRepurchaseOfCommonStock | (5,551)us-gaap_PaymentsForRepurchaseOfCommonStock
Cash dividends paid | (17,852)us-gaap_PaymentsOfDividends | (15,618)us-gaap_PaymentsOfDividends | (15,817)us-gaap_PaymentsOfDividends
Stock options exercised | 565 us-gaap_ProceedsFromStockOptionsExercised | 533 us-gaap_ProceedsFromStockOptionsExercised | 885 us-gaap_ProceedsFromStockOptionsExercised
Net cash used in financing activities | 282,980 us-gaap_NetCashProvidedByUsedInFinancingActivities | 244,649 us-gaap_NetCashProvidedByUsedInFinancingActivities | 111,595 us-gaap_NetCashProvidedByUsedInFinancingActivities
Net (decrease) increase in cash and cash equivalents | 780 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (6,940)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (15,296)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of year | 33,485 us-gaap_CashAndCashEquivalentsAtCarryingValue | 40,425 us-gaap_CashAndCashEquivalentsAtCarryingValue | 55,721 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of year | 34,265 us-gaap_CashAndCashEquivalentsAtCarryingValue | 33,485 us-gaap_CashAndCashEquivalentsAtCarryingValue | 40,425 us-gaap_CashAndCashEquivalentsAtCarryingValue
Holding Company [Member] |  |  |
Operating activities: |  |  |
Net income | 44,239 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = ffic_HoldingCompanyMember | 37,752 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = ffic_HoldingCompanyMember | 34,331 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = ffic_HoldingCompanyMember
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Equity in undistributed earnings of the Bank | (24,105)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = ffic_HoldingCompanyMember | (21,450)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = ffic_HoldingCompanyMember | (14,835)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = ffic_HoldingCompanyMember
Net gain on sale of securities |  | (17)us-gaap_GainLossOnSaleOfSecuritiesNet / dei_LegalEntityAxis = ffic_HoldingCompanyMember |
Deferred income tax (benefit) provision | 17 us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = ffic_HoldingCompanyMember | (2,348)us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = ffic_HoldingCompanyMember | 858 us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = ffic_HoldingCompanyMember
Fair value adjustments for financial assets and financial liabilities | (779)us-gaap_FairValueOptionChangesInFairValueGainLoss1 / dei_LegalEntityAxis = ffic_HoldingCompanyMember | 5,475 us-gaap_FairValueOptionChangesInFairValueGainLoss1 / dei_LegalEntityAxis = ffic_HoldingCompanyMember | (1,991)us-gaap_FairValueOptionChangesInFairValueGainLoss1 / dei_LegalEntityAxis = ffic_HoldingCompanyMember
Stock based compensation expense | 4,246 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = ffic_HoldingCompanyMember | 3,068 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = ffic_HoldingCompanyMember | 3,105 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = ffic_HoldingCompanyMember
Net change in operating assets and liabilities | 2,088 us-gaap_IncreaseDecreaseInOperatingCapital / dei_LegalEntityAxis = ffic_HoldingCompanyMember | 1,746 us-gaap_IncreaseDecreaseInOperatingCapital / dei_LegalEntityAxis = ffic_HoldingCompanyMember | 1,287 us-gaap_IncreaseDecreaseInOperatingCapital / dei_LegalEntityAxis = ffic_HoldingCompanyMember
Net cash provided by operating activities | 25,706 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = ffic_HoldingCompanyMember | 24,226 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = ffic_HoldingCompanyMember | 22,755 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = ffic_HoldingCompanyMember
Investing activities: |  |  |
Purchases of securities available for sale | (22)us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = ffic_HoldingCompanyMember | (23)us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = ffic_HoldingCompanyMember | (29)us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = ffic_HoldingCompanyMember
Proceeds from sales and calls of securities available for sale | 1,699 ffic_ProceedsFromSalesAndCallsOfAvailableForSaleSecurities / dei_LegalEntityAxis = ffic_HoldingCompanyMember | 517 ffic_ProceedsFromSalesAndCallsOfAvailableForSaleSecurities / dei_LegalEntityAxis = ffic_HoldingCompanyMember |
Net cash provided by (used in) investing activities | 1,677 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = ffic_HoldingCompanyMember | 494 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = ffic_HoldingCompanyMember | (29)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = ffic_HoldingCompanyMember
Financing activities: |  |  |
Purchase of treasury stock | (18,872)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = ffic_HoldingCompanyMember | (14,151)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = ffic_HoldingCompanyMember | (5,622)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = ffic_HoldingCompanyMember
Cash dividends paid | (17,852)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = ffic_HoldingCompanyMember | (15,618)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = ffic_HoldingCompanyMember | (15,817)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = ffic_HoldingCompanyMember
Stock options exercised | 565 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = ffic_HoldingCompanyMember | 533 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = ffic_HoldingCompanyMember | 956 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = ffic_HoldingCompanyMember
Net cash used in financing activities | (36,159)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = ffic_HoldingCompanyMember | (29,236)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = ffic_HoldingCompanyMember | (20,483)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = ffic_HoldingCompanyMember
Net (decrease) increase in cash and cash equivalents | (8,776)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = ffic_HoldingCompanyMember | (4,516)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = ffic_HoldingCompanyMember | 2,243 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = ffic_HoldingCompanyMember
Cash and cash equivalents, beginning of year | 16,525 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = ffic_HoldingCompanyMember | 21,041 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = ffic_HoldingCompanyMember | 18,798 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = ffic_HoldingCompanyMember
Cash and cash equivalents, end of year | $ 7,749 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = ffic_HoldingCompanyMember | $ 16,525 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = ffic_HoldingCompanyMember | $ 21,041 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = ffic_HoldingCompanyMember

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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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