Commitments and Contingencies - Credit-Related Commitments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Loan commitments
Commitments to Extend Credit
Expire in One Year or Less	$ 2,984,815
Expire After One Year Through Three Years	2,391,830
Expire After Three Year Through Five Years	1,091,375
Expire After Five Years	2,076,229
Total	8,544,249	$ 8,211,571
Commercial letters of credit and SBLCs
Commitments to Extend Credit
Expire in One Year or Less	703,038
Expire After One Year Through Three Years	567,135
Expire After Three Year Through Five Years	84,709
Expire After Five Years	1,075,196
Total	2,430,078	2,291,966
Commitments to Extend Credit
Commitments to Extend Credit
Expire in One Year or Less	3,687,853
Expire After One Year Through Three Years	2,958,965
Expire After Three Year Through Five Years	1,176,084
Expire After Five Years	3,151,425
Total	$ 10,974,327	$ 10,503,537