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Note 8 - Deposits (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Note 8 - Deposits (Details) [Line Items] |  |
Interest-bearing Domestic Deposit, Brokered | $ 763,900,000 us-gaap_InterestBearingDomesticDepositBrokered | $ 517,400,000 us-gaap_InterestBearingDomesticDepositBrokered
Time Deposits, $250,000 or More | 109,600,000 ffic_TimeDeposits250000OrMore | 75,600,000 ffic_TimeDeposits250000OrMore
Deposits | 3,508,598,000 us-gaap_Deposits | 3,232,780,000 us-gaap_Deposits
ICS Deposits [Member] | Government Deposits [Member] |  |
Note 8 - Deposits (Details) [Line Items] |  |
Deposits | 94,000,000 us-gaap_Deposits / us-gaap_FairValueByLiabilityClassAxis = ffic_GovernmentDepositsMember / us-gaap_FinancialInstrumentAxis = ffic_ICSDepositsMember |
Collateralized Deposits [Member] | Government Deposits [Member] |  |
Note 8 - Deposits (Details) [Line Items] |  |
Deposits | 797,900,000 us-gaap_Deposits / us-gaap_FairValueByLiabilityClassAxis = ffic_GovernmentDepositsMember / us-gaap_FinancialInstrumentAxis = ffic_CollateralizedDepositsMember |
Securities Pledged as Collateral [Member] | Government Deposits [Member] |  |
Note 8 - Deposits (Details) [Line Items] |  |
Deposit Liabilities, Collateral Issued, Financial Instruments | 379,300,000 us-gaap_DepositLiabilitiesCollateralIssuedFinancialInstruments / us-gaap_FairValueByLiabilityClassAxis = ffic_GovernmentDepositsMember / us-gaap_FinancialInstrumentAxis = us-gaap_SecuritiesPledgedAsCollateralMember | 407,400,000 us-gaap_DepositLiabilitiesCollateralIssuedFinancialInstruments / us-gaap_FairValueByLiabilityClassAxis = ffic_GovernmentDepositsMember / us-gaap_FinancialInstrumentAxis = us-gaap_SecuritiesPledgedAsCollateralMember
Letter of Credit Pledged as Collateral [Member] | Government Deposits [Member] |  |
Note 8 - Deposits (Details) [Line Items] |  |
Deposit Liabilities, Collateral Issued, Financial Instruments | 499,100,000 us-gaap_DepositLiabilitiesCollateralIssuedFinancialInstruments / us-gaap_FairValueByLiabilityClassAxis = ffic_GovernmentDepositsMember / us-gaap_FinancialInstrumentAxis = ffic_LetterOfCreditPledgedAsCollateralMember | 517,800,000 us-gaap_DepositLiabilitiesCollateralIssuedFinancialInstruments / us-gaap_FairValueByLiabilityClassAxis = ffic_GovernmentDepositsMember / us-gaap_FinancialInstrumentAxis = ffic_LetterOfCreditPledgedAsCollateralMember
Letter of Credit Pledged as Collateral [Member] |  |
Note 8 - Deposits (Details) [Line Items] |  |
Deposit Liabilities, Collateral Issued, Financial Instruments | 499,100,000 us-gaap_DepositLiabilitiesCollateralIssuedFinancialInstruments / us-gaap_FinancialInstrumentAxis = ffic_LetterOfCreditPledgedAsCollateralMember |
Government Deposits [Member] |  |
Note 8 - Deposits (Details) [Line Items] |  |
Deposits |  | 867,100,000 us-gaap_Deposits / us-gaap_FairValueByLiabilityClassAxis = ffic_GovernmentDepositsMember
Denomination [Member] |  |
Note 8 - Deposits (Details) [Line Items] |  |
Interest-bearing Domestic Deposit, Brokered | 1,000.00 us-gaap_InterestBearingDomesticDepositBrokered / us-gaap_StatementScenarioAxis = ffic_DenominationMember | 1,000.00 us-gaap_InterestBearingDomesticDepositBrokered / us-gaap_StatementScenarioAxis = ffic_DenominationMember
Government Deposits [Member] |  |
Note 8 - Deposits (Details) [Line Items] |  |
Deposits | $ 891,900,000 us-gaap_Deposits / dei_LegalEntityAxis = ffic_GovernmentDepositsMember |

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- Definition The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $250,000 or more. + References No definition available. + Details
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- Definition Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6479006&loc=d3e64164-112818 + Details
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- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 + Details
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- Definition Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 + Details
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