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Loans and Allowance for Credit Losses for Loans - Summary of Collateral Dependent Loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans $ 49,391,420 $ 48,799,711
Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 10,870,036 9,931,400
Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 28,825,920 29,644,958
Commercial real estate | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 25,971,061 26,530,225
Commercial real estate | Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 2,854,859 3,114,733
Residential mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 5,709,971 5,632,516
Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 3,985,493 3,590,837
Consumer loans | Home equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 634,553 604,433
Collateral Pledged    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 326,988 329,702
Non-accrual loans collateralized 48,600 49,200
Collateral Pledged | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 114,302 131,898
Collateral Pledged | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 182,046 172,666
Collateral Pledged | Commercial real estate | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 177,569 156,825
Collateral Pledged | Commercial real estate | Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 4,477 15,841
Collateral Pledged | Residential mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 29,317 23,797
Collateral Pledged | Consumer loans | Home equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans $ 1,323 $ 1,341