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Fair Value of Financial Instruments - Assets and Liabilities Carried at Fair Value on a Non-recurring Basis, Fair Value (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020
Impaired loans | $ 1,081 | $ 11,980
Other repossessed assets | 239 |
Total assets | 1,320 | 11,980
Fair Value, Inputs, Level 3 [Member] |  |
Impaired loans | 1,081 | 11,980
Other repossessed assets | 239 |
Total assets | $ 1,320 | $ 11,980

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- Definition Represents the fair value portion of impaired loans. + References No definition available. + Details
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Balance Type: | debit
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- Definition Other Repossessed Assets + References No definition available. + Details
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Namespace Prefix: | ffic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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://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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