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Note 10 - Fair Value of Financial Instruments (Details) - Carrying Amounts and Estimated Fair Values of Selected Financial Instruments as Well as Assumptions Used in Estimating Fair Value (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets:
Carrying Amount, Assets	$ 5,270,495us-gaap_Assets	$ 5,077,013us-gaap_Assets
Liabilities:
Carrying Amount, Liabilities	4,804,609us-gaap_Liabilities	4,620,766us-gaap_Liabilities
Borrowings [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities:
Fair Value, Liabilities	1,123,182us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_BorrowingsMember	1,041,657us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_BorrowingsMember
Borrowings [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities:
Fair Value, Liabilities	28,244us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_BorrowingsMember	28,771us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = us-gaap_BorrowingsMember
Borrowings [Member]
Liabilities:
Carrying Amount, Liabilities	1,135,291us-gaap_Liabilities / us-gaap_FairValueByLiabilityClassAxis = us-gaap_BorrowingsMember	1,056,492us-gaap_Liabilities / us-gaap_FairValueByLiabilityClassAxis = us-gaap_BorrowingsMember
Fair Value, Liabilities	1,151,426us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = us-gaap_BorrowingsMember	1,070,428us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = us-gaap_BorrowingsMember
Interest Rate Swaps [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities:
Fair Value, Liabilities	4,118us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = ffic_InterestRateSwapsMember	2,649us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = ffic_InterestRateSwapsMember
Interest Rate Swaps [Member]
Liabilities:
Carrying Amount, Liabilities	4,118us-gaap_Liabilities / us-gaap_FairValueByLiabilityClassAxis = ffic_InterestRateSwapsMember	2,649us-gaap_Liabilities / us-gaap_FairValueByLiabilityClassAxis = ffic_InterestRateSwapsMember
Fair Value, Liabilities	4,118us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = ffic_InterestRateSwapsMember	2,649us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = ffic_InterestRateSwapsMember
Total Liabilities - Financial Instruments [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities:
Fair Value, Liabilities	2,313,421us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByLiabilityClassAxis = ffic_TotalLiabilitiesFinancialInstrumentsMember	2,202,775us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByLiabilityClassAxis = ffic_TotalLiabilitiesFinancialInstrumentsMember
Total Liabilities - Financial Instruments [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities:
Fair Value, Liabilities	2,440,000us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = ffic_TotalLiabilitiesFinancialInstrumentsMember	2,365,654us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = ffic_TotalLiabilitiesFinancialInstrumentsMember
Total Liabilities - Financial Instruments [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities:
Fair Value, Liabilities	28,244us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = ffic_TotalLiabilitiesFinancialInstrumentsMember	28,771us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = ffic_TotalLiabilitiesFinancialInstrumentsMember
Total Liabilities - Financial Instruments [Member]
Liabilities:
Carrying Amount, Liabilities	4,745,551us-gaap_Liabilities / us-gaap_FairValueByLiabilityClassAxis = ffic_TotalLiabilitiesFinancialInstrumentsMember	4,567,739us-gaap_Liabilities / us-gaap_FairValueByLiabilityClassAxis = ffic_TotalLiabilitiesFinancialInstrumentsMember
Fair Value, Liabilities	4,781,665us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = ffic_TotalLiabilitiesFinancialInstrumentsMember	4,597,200us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = ffic_TotalLiabilitiesFinancialInstrumentsMember
Deposits [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities:
Fair Value, Liabilities	2,313,421us-gaap_LiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DepositsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	2,202,775us-gaap_LiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DepositsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities:
Fair Value, Liabilities	1,312,700us-gaap_LiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DepositsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	1,321,348us-gaap_LiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DepositsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Deposits [Member]
Liabilities:
Carrying Amount, Liabilities	3,606,142us-gaap_Liabilities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DepositsMember	3,508,598us-gaap_Liabilities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DepositsMember
Fair Value, Liabilities	3,626,121us-gaap_LiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DepositsMember	3,524,123us-gaap_LiabilitiesFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_DepositsMember
Fair Value, Inputs, Level 1 [Member] | Cash And Due From Banks [Member]
Assets:
Fair Value, Assets	21,104us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_CashAndDueFromBanksMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	34,265us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_CashAndDueFromBanksMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 [Member] | Total Assets - Financial Instruments [Member]
Assets:
Fair Value, Assets	21,104us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_TotalAssetsFinancialInstrumentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	34,265us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_TotalAssetsFinancialInstrumentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member]
Assets:
Fair Value, Assets	717,729us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	704,933us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 [Member] | Other Securities [Member]
Assets:
Fair Value, Assets	268,302us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_OtherSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	245,768us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_OtherSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 [Member] | FHLB - NY Stock [Member]
Assets:
Fair Value, Assets	50,488us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_FHLBNYStockMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	46,924us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_FHLBNYStockMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swaps [Member]
Assets:
Fair Value, Assets	6us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_InterestRateSwapsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	84us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_InterestRateSwapsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 [Member] | Total Assets - Financial Instruments [Member]
Assets:
Fair Value, Assets	1,036,525us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_TotalAssetsFinancialInstrumentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	997,709us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_TotalAssetsFinancialInstrumentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member] | Other Securities [Member]
Assets:
Fair Value, Assets	21,653us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_OtherSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	22,609us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_OtherSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 [Member] | Loans [Member]
Assets:
Fair Value, Assets	4,052,578us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_LoansBalanceSheetLocationMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	3,871,087us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_LoansBalanceSheetLocationMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Assets:
Fair Value, Assets	5,252us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	6,326us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 [Member] | Total Assets - Financial Instruments [Member]
Assets:
Fair Value, Assets	4,079,483us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_TotalAssetsFinancialInstrumentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	3,900,022us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_TotalAssetsFinancialInstrumentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Cash And Due From Banks [Member]
Assets:
Carrying Amount, Assets	21,104us-gaap_Assets / us-gaap_FairValueByAssetClassAxis = ffic_CashAndDueFromBanksMember	34,265us-gaap_Assets / us-gaap_FairValueByAssetClassAxis = ffic_CashAndDueFromBanksMember
Fair Value, Assets	21,104us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_CashAndDueFromBanksMember	34,265us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_CashAndDueFromBanksMember
Collateralized Mortgage Backed Securities [Member]
Assets:
Carrying Amount, Assets	717,729us-gaap_Assets / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesMember	704,933us-gaap_Assets / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesMember
Fair Value, Assets	717,729us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesMember	704,933us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesMember
Other Securities [Member]
Assets:
Carrying Amount, Assets	289,955us-gaap_Assets / us-gaap_FairValueByAssetClassAxis = ffic_OtherSecuritiesMember	268,377us-gaap_Assets / us-gaap_FairValueByAssetClassAxis = ffic_OtherSecuritiesMember
Fair Value, Assets	289,955us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_OtherSecuritiesMember	268,377us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_OtherSecuritiesMember
Loans [Member]
Assets:
Carrying Amount, Assets	3,998,054us-gaap_Assets / us-gaap_FairValueByAssetClassAxis = ffic_LoansBalanceSheetLocationMember	3,810,373us-gaap_Assets / us-gaap_FairValueByAssetClassAxis = ffic_LoansBalanceSheetLocationMember
Fair Value, Assets	4,052,578us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_LoansBalanceSheetLocationMember	3,871,087us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_LoansBalanceSheetLocationMember
FHLB - NY Stock [Member]
Assets:
Carrying Amount, Assets	50,488us-gaap_Assets / us-gaap_FairValueByAssetClassAxis = ffic_FHLBNYStockMember	46,924us-gaap_Assets / us-gaap_FairValueByAssetClassAxis = ffic_FHLBNYStockMember
Fair Value, Assets	50,488us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_FHLBNYStockMember	46,924us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_FHLBNYStockMember
Interest Rate Swaps [Member]
Assets:
Carrying Amount, Assets	6us-gaap_Assets / us-gaap_FairValueByAssetClassAxis = ffic_InterestRateSwapsMember	84us-gaap_Assets / us-gaap_FairValueByAssetClassAxis = ffic_InterestRateSwapsMember
Fair Value, Assets	6us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_InterestRateSwapsMember	84us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_InterestRateSwapsMember
Other Real Estate Owned [Member]
Assets:
Carrying Amount, Assets	5,252us-gaap_Assets / us-gaap_FairValueByAssetClassAxis = ffic_OtherRealEstateOwnedMember	6,326us-gaap_Assets / us-gaap_FairValueByAssetClassAxis = ffic_OtherRealEstateOwnedMember
Fair Value, Assets	5,252us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_OtherRealEstateOwnedMember	6,326us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_OtherRealEstateOwnedMember
Total Assets - Financial Instruments [Member]
Assets:
Carrying Amount, Assets	5,082,588us-gaap_Assets / us-gaap_FairValueByAssetClassAxis = ffic_TotalAssetsFinancialInstrumentsMember	4,871,282us-gaap_Assets / us-gaap_FairValueByAssetClassAxis = ffic_TotalAssetsFinancialInstrumentsMember
Fair Value, Assets	$ 5,137,112us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_TotalAssetsFinancialInstrumentsMember	$ 4,931,996us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ffic_TotalAssetsFinancialInstrumentsMember

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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Fair value of financial and nonfinancial obligations.

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