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Loans Receivable and Allowance for Credit Losses (Schedule of Summarized Loans Receivable) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans $ 9,819,643 $ 9,839,858
Premiums on purchased loans 1,378 1,566
Unearned discounts (7) (12)
Net deferred fees (17,478) (18,522)
Total loans 9,803,536 9,822,890
Mortgage Portfolio Segment    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 6,945,287 6,779,822
Mortgage Portfolio Segment | Residential    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 1,277,376 1,294,702
Mortgage Portfolio Segment | Commercial    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 3,594,012 3,458,666
Mortgage Portfolio Segment | Multi-Family    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 1,458,193 1,484,515
Mortgage Portfolio Segment | Construction    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 615,706 541,939
Commercial Loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 2,510,708 2,567,470
Consumer Loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans $ 363,648 $ 492,566