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Related Party Transactions (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) loan | Dec. 31, 2022 USD ($) loan
Note to Financial Statements |  |
Number of Related Party Loans | loan | 0 | 0
Related Party Deposit Liabilities | $ | $ 4.9 | $ 7.7

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- References No definition available. + Details
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Namespace Prefix: | ffic_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents number of related party loans. + References No definition available. + Details
Name: | ffic_NumberOfRelatedPartyLoans
Namespace Prefix: | ffic_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of deposits held by the entity for a related party (entity, shareholder, employee). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(k)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 + Details
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Balance Type: | credit
Period Type: | instant