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Loans Receivable and Allowance for Credit Losses (Summary of Activities in Allowance for loan losses by Portfolio Segments and Unfunded Credit Commitments) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Allowance for unfunded credit reserves        
Allowance for unfunded credit commitments, beginning of period     $ 33,500  
(Reversal of) provision for credit losses $ (10,000) $ 10,000 (25,000) $ 186,313
Allowance for unfunded credit commitments, end of period 28,000   28,000  
Unfunded Credit Commitments        
Allowance for unfunded credit reserves        
Allowance for unfunded credit commitments, beginning of period 26,300 28,972 33,577 11,158
(Reversal of) provision for credit losses 1,736 111 (5,541) 7,468
Allowance for unfunded credit commitments, end of period 28,036 29,083 28,036 29,083
Cumulative Effect, Period Of Adoption, Adjustment        
Allowance for unfunded credit reserves        
Allowance for unfunded credit commitments, beginning of period $ 0 $ 0 $ 0 $ 10,457