Commitments and Contingencies - Credit-Related Commitments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Loan commitments
Commitments to Extend Credit
Expire in One Year or Less	$ 4,650,619
Expire After One Year Through Three Years	3,689,245
Expire After Three Years Through Five Years	1,037,254
Expire After Five Years	139,325
Total	9,516,443	$ 8,211,571
Commercial letters of credit and SBLCs
Commitments to Extend Credit
Expire in One Year or Less	875,757
Expire After One Year Through Three Years	405,377
Expire After Three Years Through Five Years	122,255
Expire After Five Years	1,124,405
Total	2,527,794	2,291,966
Commitments to Extend Credit
Commitments to Extend Credit
Expire in One Year or Less	5,526,376
Expire After One Year Through Three Years	4,094,622
Expire After Three Years Through Five Years	1,159,509
Expire After Five Years	1,263,730
Total	$ 12,044,237	$ 10,503,537