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Loans and Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Aggregate outstanding loans $ 6,704,674 $ 5,772,206
Non-accrual loans   $ 12,813
Servicing Mortgage Loans [Member]    
Servicing Asset, Loans Serviced, Amount 62,000  
Commercial Real Estate    
Aggregate outstanding loans 1,758,384  
Multi-family Residential Portfolio Segment [Member]    
Aggregate outstanding loans $ 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 83.40% 84.80%
Taxi Medallion Portfolio Segment [Member]    
Aggregate outstanding loans $ 2,597  
Taxi Medallion Portfolio Segment [Member] | Performing Financial Instruments [Member]    
Non-accrual loans 1,700  
Taxi Medallion Portfolio Segment [Member] | Performing Financial Instruments [Member]    
Non-accrual loans 400  
Commercial Business and Other Portfolio Segment [Member]    
Aggregate outstanding loans 1,299,409  
Commercial Business and Other Portfolio Segment [Member] | Performing Financial Instruments [Member]    
Non-accrual loans 900  
Commercial Business and Other Portfolio Segment [Member] | Performing Financial Instruments [Member]    
Non-accrual loans $ 2,200