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Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters, Summary of Lending Related and Other Commitments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Schedule of lending-related and other commitments [Line Items]    
Lending related commitments, fair value $ 0 $ 0
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(a)(b)    
Summary of lending-related and other commitments    
Lending related commitments 10,274,533 10,010,492
Commercial letters of credit(a)    
Summary of lending-related and other commitments    
Lending related commitments 5,779 3,642
Standby letters of credit(c)    
Summary of lending-related and other commitments    
Lending related commitments 251,341 278,798
Standby letters of credit, fair value $ 3,000 $ 3,000