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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2023
Sep. 30, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Net Income (Loss) $ (49,245) $ 8,906 $ 5,322 $ 3,684 $ 8,099 $ 7,835 $ 8,686 $ 4,044     $ (31,333) $ 28,664 $ 76,945
Error Correction, Type [Extensible Enumeration]           ffic:AccountingTreatmentOfEmployeeRetentionCreditsMember ffic:AccountingTreatmentOfEmployeeRetentionCreditsMember ffic:AccountingTreatmentOfEmployeeRetentionCreditsMember ffic:AccountingTreatmentOfEmployeeRetentionCreditsMember ffic:AccountingTreatmentOfEmployeeRetentionCreditsMember      
Error correction adjustment                          
Net Income (Loss)           $ (1,600) $ 100 $ (1,100) $ (1,100) $ (2,600)