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Loans and Allowance for Credit Losses Summary Of Gross Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total $ 24,041,489 $ 24,044,919
Real estate - commercial mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Net loans 9,734,156 9,601,858
Total 9,734,156 9,601,858
Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Net loans 4,437,905 4,605,589
Total 4,437,905 4,605,589
Real estate - residential mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Net loans 6,617,017 6,349,643
Total 6,617,017 6,349,643
Real estate - home equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Net loans 1,214,399 1,160,616
Total 1,214,399 1,160,616
Real-estate - construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Net loans 1,134,748 1,394,899
Total 1,134,748 1,394,899
Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Net loans 566,291 616,856
Total 566,291 616,856
Leases and other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Net loans 336,973 315,458
Total 336,973 315,458
Financing receivable, unearned income $ 37,800 $ 35,600