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Loans and Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Provision (benefit) for credit losses $ 4,900 $ 22,600 $ 2,800  
Allowance for credit losses 37,135 45,153 21,751 $ 20,945
Aggregate outstanding loans 6,638,105 6,704,674    
Servicing Mortgage Loans [Member]        
Servicing Asset, Loans Serviced, Amount 34,100      
Loans Receivable [Member]        
Interest Receivable 35,800 41,500    
Commercial Real Estate        
Allowance for credit losses 7,158 8,327 4,429 4,315
Aggregate outstanding loans 1,777,375 1,758,384    
Multi-family Residential Portfolio Segment [Member]        
Allowance for credit losses 8,185 6,557 5,391 5,676
Aggregate outstanding loans $ 2,519,227 $ 2,535,977    
Multi-family Residential Property and Commercial Real Estate and Commercial Business and Other Loans [Member]        
Loan Origination, Underwriting Requirements, Minimum Debt Service Coverage 125.00%      
Loan Origination, Value, Maximum Percentage 75.00%      
Multi-family Residential Property and Commercial Real Estate and Commercial Business and Other Loans [Member] | Gross Loans [Member] | Credit Concentration Risk [Member]        
Concentration Risk, Percentage 84.90% 83.40%    
Taxi Medallion Portfolio Segment [Member]        
Aggregate outstanding loans   $ 2,597    
Taxi Medallion Portfolio Segment [Member] | Performing Financial Instruments [Member]        
Non-accrual loans   400    
Commercial Business and Other Portfolio Segment [Member]        
Allowance for credit losses $ 17,858 24,666 $ 8,554 $ 7,591
Aggregate outstanding loans 1,337,446 1,299,409    
Commercial Business and Other Portfolio Segment [Member] | Performing Financial Instruments [Member]        
Non-accrual loans $ 100 $ 2,200