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Fair Value of Financial Instruments (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Financial Assets at Fair Value Option | $ 14,600 | $ 14,500 |
Financial Liabilities at Fair Value Option | 56,500 | 43,100 |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | (12,995) | (2,142) | $ (5,353)
Financial Liabilities at Fair Value Option Contractual Principal | 61,900 | 61,900 |
Financial Liabilities at Fair Value Option Accrued Interest Payable | $ 100 | 100 |
Appraised Value of Property [Member] |  |  |
Collateral Dependent Loans Measurement Input | 85 |  |
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ 0 | 0 |
Interest Rate Swap [Member] |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | $ 1,000 | $ 2,300 | $ 3,000

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

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

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- Definition The fair value option of financial liabilities. + References No definition available. + Details
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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

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

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- 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=123596393&loc=d3e14172-108612 + Details
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Balance Type: | credit
Period Type: | duration

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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=123874694&loc=d3e19207-110258 + Details
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- Details
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- Details
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- Details
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Balance Type: |
Period Type: |