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Note 10 - Fair Value of Financial Instruments (Details) - Financial Assets and Liabilities Reported Under the Fair Value Option (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value Measurements	$ 32,600ffic_FinancialAssetsAtFairValueOption				$ 32,600ffic_FinancialAssetsAtFairValueOption
Changes in Fair Values For Items Measured at Fair Value Pursuant to Election of the Fair Value Option	(595)us-gaap_FairValueOptionChangesInFairValueGainLoss1		(644)us-gaap_FairValueOptionChangesInFairValueGainLoss1
Collateralized Mortgage Backed Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value Measurements	4,458ffic_FinancialAssetsAtFairValueOption / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MortgageBackedSecuritiesMember				4,678ffic_FinancialAssetsAtFairValueOption / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MortgageBackedSecuritiesMember
Changes in Fair Values For Items Measured at Fair Value Pursuant to Election of the Fair Value Option	(8)us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MortgageBackedSecuritiesMember		48us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MortgageBackedSecuritiesMember
Other Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value Measurements	28,170ffic_FinancialAssetsAtFairValueOption / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ffic_OtherSecuritiesMember				27,915ffic_FinancialAssetsAtFairValueOption / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ffic_OtherSecuritiesMember
Changes in Fair Values For Items Measured at Fair Value Pursuant to Election of the Fair Value Option	197us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ffic_OtherSecuritiesMember		325us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ffic_OtherSecuritiesMember
Borrowed Funds [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value Measurements	28,244ffic_FinancialAssetsAtFairValueOption / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ffic_BorrowedFundsMember				28,771ffic_FinancialAssetsAtFairValueOption / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ffic_BorrowedFundsMember
Changes in Fair Values For Items Measured at Fair Value Pursuant to Election of the Fair Value Option	524us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ffic_BorrowedFundsMember		25us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ffic_BorrowedFundsMember
Financial Assets And Liabilities, Excluding Interest Rate Caps / Swaps [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in Fair Values For Items Measured at Fair Value Pursuant to Election of the Fair Value Option	$ 713us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ffic_FinancialAssetsAndLiabilitiesExcludingInterestRateCapsSwapsMember	[1]	$ 398us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ffic_FinancialAssetsAndLiabilitiesExcludingInterestRateCapsSwapsMember	[1]
[1] The net gain from fair value adjustments presented in the above table does not include net losses of $1.3 million and $1.0 million for the three months ended March 31, 2015 and 2014, respectively, from the change in the fair value of interest rate swaps.

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- Definition

Financial Assets At Fair Value Option

+ References

No definition available.

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X

- 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)

-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

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