Commitments and Contingencies - Credit-Related Commitments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Loan commitments
Commitments to Extend Credit
Expire in One Year or Less	$ 4,794,033
Expire After One Year Through Three Years	3,622,191
Expire After Three Years Through Five Years	799,699
Expire After Five Years	151,877
Total	9,367,800	$ 9,141,447
Commercial letters of credit and standby letters of credit (“SBLCs”)
Commitments to Extend Credit
Expire in One Year or Less	1,025,797
Expire After One Year Through Three Years	434,373
Expire After Three Years Through Five Years	143,006
Expire After Five Years	1,140,456
Total	2,743,632	2,610,761
Commitments to Extend Credit
Commitments to Extend Credit
Expire in One Year or Less	5,819,830
Expire After One Year Through Three Years	4,056,564
Expire After Three Years Through Five Years	942,705
Expire After Five Years	1,292,333
Total	$ 12,111,432	$ 11,752,208