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Borrowed Funds (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2016
Oct. 31, 2020
Advances from Federal Home Loan Banks and Letters of Credit $ 1,652.6    
Subordinated Borrowing, Interest Rate   5.25%  
Empire      
Subordinated debentures acquired     $ 15.3
Capital Securities [Member] | Flushing Financial Capital Trust IV [Member]      
Proceeds from Issuance of Debt 20.6    
Capital Securities [Member] | Flushing Financial Capital Trust II [Member]      
Proceeds from Issuance of Debt 20.6    
Capital Securities [Member] | Flushing Financial Capital Trust III [Member]      
Proceeds from Issuance of Debt 20.6    
Unsecured Line of Credit [Member]      
Long-term Line of Credit, Total 618.0    
Federal Home Loan Bank of New York [Member]      
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available $ 3,568.0    
Federal Home Loan Bank Advances [Member] | Federal Home Loan Bank of New York [Member] | Minimum [Member]      
Debt Instrument, Term 1 day    
Federal Home Loan Bank Advances [Member] | Federal Home Loan Bank of New York [Member] | Maximum [Member]      
Debt Instrument, Term 5 years    
Subordinated Debentures      
Debt Instrument, Face Amount   $ 75.0