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Commitments and Contingencies Outstanding Commitments to Extend Credit and Letters of Credit (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Commitments to Extend Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Valuation allowances and reserves, balance $ 9,018,523 $ 8,651,055
Standby Letters of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Valuation allowances and reserves, balance 295,516 298,750
Commercial Letters of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Valuation allowances and reserves, balance $ 57,917 $ 56,229