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Commitments and Contingencies Outstanding Commitments to Extend Credit and Letters of Credit (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Valuation allowances and reserves, balance $ 1,200 $ 2,700
Commercial and industrial    
Valuation allowances and reserves, balance 4,967,334 4,929,981
Commerical mortgage and construction    
Valuation allowances and reserves, balance 1,706,879 1,867,830
Real estate - home equity    
Valuation allowances and reserves, balance 2,154,382 1,992,700
Total commitments to extend credit    
Valuation allowances and reserves, balance 8,828,595 8,790,511
Standby letters of credit    
Valuation allowances and reserves, balance 279,309 264,440
Commercial letters of credit    
Valuation allowances and reserves, balance 48,993 67,396
Letter of Credit    
Valuation allowances and reserves, balance $ 328,302 $ 331,836