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Commitments and Contingencies Outstanding Commitments to Extend Credit and Letters of Credit (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Commitments to Extend Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Valuation allowances and reserves, balance $ 8,748,927 $ 8,828,595
Standby Letters of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Valuation allowances and reserves, balance 316,992 279,309
Commercial Letters of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Valuation allowances and reserves, balance $ 35,786 $ 48,993