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Note 11 - Fair Value of Financial Instruments (Details Textual) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($)
Financial Assets at Fair Value Option | $ 14,000 |  | $ 13,800
Financial Liabilities at Fair Value Option | 42,900 |  | 41,800
Fair Value, Option, Changes in Fair Value, Gain (Loss) | (2,080) | $ (100) |
Financial Liabilites at Fair Value Option Contractual Principal | 61,900 |  | 61,900
Financial Liabilities at Fair Value Option Accrued Interest Payable | $ 300 |  | 200
Appraised Value of Property [Member] |  |  |
Collateral Dependent Loans Measurement Input | 0.85 |  |
Fair Value, Nonrecurring [Member] |  |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ 0 |  | $ 0
Interest Rate Swaps [Member] |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | $ (1,100) | $ 1,700 |

X
- Definition Represents the collateral dependent loans measurement input. + References No definition available. + Details
Name: | ffic_CollateralDependentLoansMeasurementInput
Namespace Prefix: | ffic_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The fair value option of financial assets. + References No definition available. + Details
Name: | ffic_FinancialAssetsAtFairValueOption
Namespace Prefix: | ffic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The fair value of the option contractual principal. + References No definition available. + Details
Name: | ffic_FinancialLiabilitesAtFairValueOptionContractualPrincipal
Namespace Prefix: | ffic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fair value option of financial liabilities. + References No definition available. + Details
Name: | ffic_FinancialLiabilitiesAtFairValueOption
Namespace Prefix: | ffic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fair value of the accrued interest payable on the option. + References No definition available. + Details
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Namespace Prefix: | ffic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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Period Type: | instant

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- Details
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- Details
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- Details
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Period Type: |