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Allowance for Credit Losses (Components of Allowance for Credit Losses) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for loan losses and unfunded lending-related commitments losses $ 375,798 $ 357,448 $ 301,168 $ 299,653
Allowance for held-to-maturity securities losses 463 488 159  
Allowance for credit losses 376,261 357,936 301,327  
Loans        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for loan losses and unfunded lending-related commitments losses 287,972 270,173 250,539  
Unfunded lending-related commitments        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for loan losses and unfunded lending-related commitments losses 87,826 87,275 50,629  
Loans and unfunded lending-related commitments        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for loan losses and unfunded lending-related commitments losses $ 375,798 $ 357,448 $ 301,168