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

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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 (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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