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Summary of Significant Accounting Policies (Details)
shares in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
security
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
security
Sep. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2024
USD ($)
security
item
shares
Dec. 31, 2023
USD ($)
security
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
Other real estate owned $ 0       $ 0       $ 0 $ 0    
Restricted Cash and Cash Equivalents 43,200,000       47,900,000       43,200,000 47,900,000    
Cash (including restricted cash) held in excess of FDIC deposit insurance limits at other commercial banks 62,400,000       61,200,000       62,400,000 61,200,000    
ACL for held-to-maturity securities 353,000       1,087,000       353,000 1,087,000 $ 1,100,000 $ 862,000
Securities available for sale, Allowance for Credit Losses $ 2,627,000       $ 0       $ 2,627,000 $ 0    
Number of securities in portfolio | security 3       3       3 3    
Interest-bearing Deposits in Banks and Other Financial Institutions $ 125,200,000       $ 145,300,000       $ 125,200,000 $ 145,300,000    
Interest Income, Securities, Operating, Tax Exempt                 1,500,000 1,500,000 1,700,000  
Goodwill, Impairment Loss                 0 0 0  
Goodwill, Ending Balance 17,636,000       17,636,000       17,636,000 17,636,000    
Financing Receivable Purchase                 173,500,000 166,300,000 275,700,000  
(Benefit) provision for loans 6,440,000 $ 1,727,000 $ 809,000 $ 592,000 $ 998,000 $ 596,000 $ 1,416,000 $ 7,508,000        
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Ending Balance $ 70,098,000               70,098,000      
BOLI policies to higher yielding policies                 101,500,000      
Other than temporary impairment losses investments                 0 0    
Advertising Expense                 $ 2,500,000 $ 2,100,000 $ 3,100,000  
Maximum remaining term 51 months               51 months      
Number of business units | item                 3      
Securities similar to commercial owner occupied loan                        
Number of securities in portfolio | security 2       2       2 2    
Flushing Financial Capital Trust II                        
Capital Securities, Value Issued                 $ 60,000,000      
Common Securities With Voting Rights, Value , Issued                 $ 1,900,000      
Percentage Of Ownership Interest In Common Securities Of Trust                 100.00%      
Employee Stock Option [Member]                        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares                 0 0 0  
Bank Premises and Equipment [Member] | Minimum                        
Property, Plant and Equipment, Useful Life 3 years               3 years      
Bank Premises and Equipment [Member] | Maximum                        
Property, Plant and Equipment, Useful Life 10 years               10 years      
Consumer Portfolio Segment [Member]                        
Mortgage loans in process of foreclosure, amount $ 2,700,000       $ 4,800,000       $ 2,700,000 $ 4,800,000    
Loans Receivable [Member]                        
Interest Receivable $ 46,300,000       $ 45,000,000       $ 46,300,000 $ 45,000,000