Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities, Summary of Lending Related and Other Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
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	10,010,492	9,024,412
Commercial letters of credit(a)
Summary of lending-related and other commitments
Lending related commitments	3,642	7,081
Standby letters of credit(c)
Summary of lending-related and other commitments
Lending related commitments	278,798	277,969
Standby letters of credit, fair value	$ 3,000	$ 3,000