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Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Impact of Adoption Reflected in the Consolidated Balance Sheet) (Details) - USD ($)
$ in Thousands
Jan. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]      
Allowance for loan and lease losses   $ 450,177 $ 191,251
Reserve for unfunded lending commitments   $ 29,907 3,974
Allowance for credit losses     $ 195,225
Topic 326 [Member]      
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]      
Allowance for loan and lease losses $ 240,662    
Reserve for unfunded lending commitments 31,304    
Allowance for credit losses 271,966    
Topic 326 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Summary Of Significant Accounting Policies And Recent Accounting Pronouncements [Line Items]      
Allowance for loan and lease losses 49,411    
Reserve for unfunded lending commitments 27,330    
Allowance for credit losses 76,741    
Allowance for credit loss increase 76,741    
Balance sheet reclassification (19,767)    
Total pretax impact 56,974    
Income tax impact (12,887)    
Decrease to retained earnings $ 44,087