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Pension and Other Postretirement Benefit Plans - Employee Benefit Trust Shares (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Note 13 - Pension and Other Postretirement Benefit Plans - Employee Benefit Trust (EBT) Shares (Details) |  |
Shares owned by Employee Benefit Trust, beginning balance (in shares) | 181,611 | 329,090
Shares purchased (in shares) | 3,697 | 7,267
Shares released and allocated (in shares) | (145,447) | (154,746)
Shares owned by Employee Benefit Trust, ending balance (in shares) | 39,861 | 181,611
Market value of unallocated shares | $ 663,287 | $ 3,924,614

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- Definition Number of shares purchased during the period by the Employee Trust. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Common stock released and allocated by the Employee Trust. + References No definition available. + Details
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Namespace Prefix: | ffic_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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- Definition Aggregate value of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=75028277&loc=d3e19833-108362 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=75028277&loc=d3e19850-108362 + Details
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X
- Definition Number of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=109244457&loc=d3e16701-113920 + Details
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Period Type: | instant