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Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Dec. 31, 2014
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items] |  |
Fair Value | $ 284,363 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue | $ 374,858 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Unrealized Losses | 3,908 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses | 7,259 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses
Less Than 12 Months - Fair Value | 118,402 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue | 97,274 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Less Than 12 Months - Unrealized Losses | 1,038 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses | 846 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
12 Months or More - Fair Value | 165,961 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue | 277,584 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
12 Months or More - Unrealized Losses | 2,870 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses | 6,413 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
Corporate Debt Securities [Member] |  |
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items] |  |
Fair Value | 49,026 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 39,287 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Unrealized Losses | 974 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 714 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Less Than 12 Months - Fair Value | 19,389 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 9,573 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Less Than 12 Months - Unrealized Losses | 611 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 428 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
12 Months or More - Fair Value | 29,637 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 29,714 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
12 Months or More - Unrealized Losses | 363 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 286 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Municipal [Member] |  |
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items] |  |
Fair Value | 5,268 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_MunicipalMember | 8,810 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_MunicipalMember
Unrealized Losses | 33 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_MunicipalMember | 61 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_MunicipalMember
Less Than 12 Months - Fair Value | 5,268 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_MunicipalMember | 3,546 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_MunicipalMember
Less Than 12 Months - Unrealized Losses | 33 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_MunicipalMember | 11 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_MunicipalMember
12 Months or More - Fair Value |  | 5,264 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_MunicipalMember
12 Months or More - Unrealized Losses |  | 50 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_MunicipalMember
Other Debt Obligations [Member] |  |
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items] |  |
Fair Value | 298 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherDebtSecuritiesMember | 292 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherDebtSecuritiesMember
Unrealized Losses | 2 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherDebtSecuritiesMember | 8 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherDebtSecuritiesMember
12 Months or More - Fair Value | 298 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherDebtSecuritiesMember | 292 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherDebtSecuritiesMember
12 Months or More - Unrealized Losses | 2 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherDebtSecuritiesMember | 8 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherDebtSecuritiesMember
Available For Sale Securities, Excluding Mortgage-Backed Securities [Member] |  |
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items] |  |
Fair Value | 54,592 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_AvailableForSaleSecuritiesExcludingMortgageBackedSecuritiesMember | 48,389 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_AvailableForSaleSecuritiesExcludingMortgageBackedSecuritiesMember
Unrealized Losses | 1,009 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_AvailableForSaleSecuritiesExcludingMortgageBackedSecuritiesMember | 783 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_AvailableForSaleSecuritiesExcludingMortgageBackedSecuritiesMember
Less Than 12 Months - Fair Value | 24,657 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_AvailableForSaleSecuritiesExcludingMortgageBackedSecuritiesMember | 13,119 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_AvailableForSaleSecuritiesExcludingMortgageBackedSecuritiesMember
Less Than 12 Months - Unrealized Losses | 644 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_AvailableForSaleSecuritiesExcludingMortgageBackedSecuritiesMember | 439 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_AvailableForSaleSecuritiesExcludingMortgageBackedSecuritiesMember
12 Months or More - Fair Value | 29,935 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_AvailableForSaleSecuritiesExcludingMortgageBackedSecuritiesMember | 35,270 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_AvailableForSaleSecuritiesExcludingMortgageBackedSecuritiesMember
12 Months or More - Unrealized Losses | 365 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_AvailableForSaleSecuritiesExcludingMortgageBackedSecuritiesMember | 344 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_AvailableForSaleSecuritiesExcludingMortgageBackedSecuritiesMember
REMIC And CMO [Member] |  |
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items] |  |
Fair Value | 158,838 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_REMICAndCMOMember | 216,190 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_REMICAndCMOMember
Unrealized Losses | 2,137 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_REMICAndCMOMember | 4,627 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_REMICAndCMOMember
Less Than 12 Months - Fair Value | 55,749 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_REMICAndCMOMember | 77,382 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_REMICAndCMOMember
Less Than 12 Months - Unrealized Losses | 134 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_REMICAndCMOMember | 399 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_REMICAndCMOMember
12 Months or More - Fair Value | 103,089 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_REMICAndCMOMember | 138,808 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_REMICAndCMOMember
12 Months or More - Unrealized Losses | 2,003 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_REMICAndCMOMember | 4,228 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_REMICAndCMOMember
GNMA [Member] |  |
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items] |  |
Fair Value | 8,099 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_GNMAMember | 8,358 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_GNMAMember
Unrealized Losses | 81 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_GNMAMember | 124 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_GNMAMember
Less Than 12 Months - Fair Value | 8,099 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_GNMAMember |
Less Than 12 Months - Unrealized Losses | 81 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_GNMAMember |
12 Months or More - Fair Value |  | 8,358 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_GNMAMember
12 Months or More - Unrealized Losses |  | 124 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_GNMAMember
FNMA [Member] |  |
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items] |  |
Fair Value | 62,834 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_FNMAMember | 95,148 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_FNMAMember
Unrealized Losses | 681 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_FNMAMember | 1,717 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_FNMAMember
Less Than 12 Months - Fair Value | 29,897 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_FNMAMember |
Less Than 12 Months - Unrealized Losses | 179 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_FNMAMember |
12 Months or More - Fair Value | 32,937 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_FNMAMember | 95,148 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_FNMAMember
12 Months or More - Unrealized Losses | 502 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_FNMAMember | 1,717 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_FNMAMember
Collateralized Mortgage Backed Securities [Member] |  |
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items] |  |
Fair Value | 229,771 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember | 326,469 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember
Unrealized Losses | 2,899 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember | 6,476 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember
Less Than 12 Months - Fair Value | 93,745 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember | 84,155 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember
Less Than 12 Months - Unrealized Losses | 394 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember | 407 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember
12 Months or More - Fair Value | 136,026 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember | 242,314 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember
12 Months or More - Unrealized Losses | 2,505 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember | 6,069 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember
FHLMC [Member] |  |
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items] |  |
Fair Value |  | 6,773 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_FHLMCMember
Unrealized Losses |  | 8 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_FHLMCMember
Less Than 12 Months - Fair Value |  | 6,773 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_FHLMCMember
Less Than 12 Months - Unrealized Losses |  | $ 8 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_FHLMCMember

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