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Commitments and Contingencies Outstanding Commitments to Extend Credit and Letters of Credit (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Valuation allowances and reserves, balance $ 3,900 $ 3,800
Commitments to Extend Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Valuation allowances and reserves, balance 8,617,613 8,731,168
Standby Letters of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Valuation allowances and reserves, balance 288,676 298,275
Commercial Letters of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Valuation allowances and reserves, balance $ 53,496 $ 54,196