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Note 10 - Fair Value of Financial Instruments (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Note 10 - Fair Value of Financial Instruments (Details) [Line Items]
Financial Assets At Fair Value Option	$ 32,600,000ffic_FinancialAssetsAtFairValueOption		$ 32,600,000ffic_FinancialAssetsAtFairValueOption
Financial Liabilities At Fair Value Option	28,200,000ffic_FinancialLiabilitiesAtFairValueOption		28,800,000ffic_FinancialLiabilitiesAtFairValueOption
Financial Assets, Fair Value Option Election During Period	5,000,000ffic_FinancialAssetsFairValueOptionElectionDuringPeriod
Proceeds From Sale of Financial Assets		1,900,000ffic_ProceedsFromSaleOfFinancialAssets
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(595,000)us-gaap_FairValueOptionChangesInFairValueGainLoss1	(644,000)us-gaap_FairValueOptionChangesInFairValueGainLoss1
Financial Liabilites At Fair Value Option, Contractual Principal	61,900,000ffic_FinancialLiabilitesAtFairValueOptionContractualPrincipal		61,900,000ffic_FinancialLiabilitesAtFairValueOptionContractualPrincipal
Financial Liabilities At Fair Value Option, Accrued Interest Payable	100,000ffic_FinancialLiabilitiesAtFairValueOptionAccruedInterestPayable		100,000ffic_FinancialLiabilitiesAtFairValueOptionAccruedInterestPayable
Liabilities, Fair Value Disclosure, Nonrecurring	0us-gaap_LiabilitiesFairValueDisclosureNonrecurring	0us-gaap_LiabilitiesFairValueDisclosureNonrecurring
Nonaccruing Collateral Dependent Loans - Percent Of The Appraised Or Internally Estimated Value Of The Property [Member]
Note 10 - Fair Value of Financial Instruments (Details) [Line Items]
Fair Value Inputs, Discount Rate	85.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FinancialInstrumentAxis = ffic_NonaccruingCollateralDependentLoansPercentOfTheAppraisedOrInternallyEstimatedValueOfThePropertyMember
Interest Rate Swaps [Member]
Note 10 - Fair Value of Financial Instruments (Details) [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$ 1,300,000us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ffic_InterestRateSwapsMember	$ 1,000,000us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ffic_InterestRateSwapsMember

X

- Definition

Financial Assets At Fair Value Option

+ References

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- Definition

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- Definition

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+ References

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- Definition

Financial Liabilities At Fair Value Option

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- Definition

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- Definition

Proceeds received during current period for sale of financial assets.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 30

-Subparagraph (a)

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Aggregation of the liabilities reported on the balance sheet measured at fair value on a nonrecurring basis by the entity.

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