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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Commitments And Contingencies [Line Items]        
Allowance for credit loss $ 52,420 $ 30,482 $ 33,914 $ 34,672
Statute of limitations period 3 years      
New York [Member]        
Commitments And Contingencies [Line Items]        
Statute of limitations period 6 years      
Unfunded Commitments [Member] | Provision for Credit Losses [Member]        
Commitments And Contingencies [Line Items]        
Credit loss expense $ 1,000 0    
Unfunded Commitments [Member] | Other Liabilities [Member]        
Commitments And Contingencies [Line Items]        
Allowance for credit loss $ 3,100 $ 0