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Commitments and Contingencies - Financial instruments with off-Balance Sheet credit risk (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Commitments to extend credit | Credit card lines    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Unused commitments to extend credit $ 6,108,939 $ 5,853,990
Commitments to extend credit | Commercial Lines of Credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Unused commitments to extend credit 3,626,269 3,523,930
Commitments to extend credit | Construction Lines of Credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Unused commitments to extend credit 1,287,679 901,895
Commitments to extend credit | Other consumer unused credit commitments    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Unused commitments to extend credit 256,610 250,271
Commercial letters of credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Unused commitments to extend credit 1,404 3,351
Standby letters of credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Unused commitments to extend credit 80,889 27,868
Commitments to originate or fund mortgage loans    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Unused commitments to extend credit $ 32,968 $ 45,170