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Commitments and Contingencies Outstanding Commitments to Extend Credit and Letters of Credit (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Valuation allowances and reserves, balance $ 2,700 $ 6,000
Commercial and industrial    
Valuation allowances and reserves, balance 4,929,981 4,832,858
Commerical mortgage and construction    
Valuation allowances and reserves, balance 1,867,830 1,972,505
Real estate - home equity    
Valuation allowances and reserves, balance 1,992,700 1,890,258
Total commitments to extend credit    
Valuation allowances and reserves, balance 8,790,511 8,695,621
Standby letters of credit    
Valuation allowances and reserves, balance 264,440 260,829
Commercial letters of credit    
Valuation allowances and reserves, balance 67,396 49,288
Letter of Credit    
Valuation allowances and reserves, balance $ 331,836 $ 310,117