Commitments and Contingencies - Schedule of Credit-Related Commitments (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Loan commitments
Commitments to Extend Credit
Expire in One Year or Less	$ 4,947,041
Expire After One Year Through Three Years	3,735,250
Expire After Three Years Through Five Years	639,101
Expire After Five Years	97,652
Total	9,419,044	$ 9,128,040
Commercial letters of credit and standby letters of credit (“SBLCs”)
Commitments to Extend Credit
Expire in One Year or Less	1,413,936
Expire After One Year Through Three Years	506,597
Expire After Three Years Through Five Years	152,263
Expire After Five Years	1,057,314
Total	3,130,110	2,917,029
Commitments to Extend Credit
Commitments to Extend Credit
Expire in One Year or Less	6,360,977
Expire After One Year Through Three Years	4,241,847
Expire After Three Years Through Five Years	791,364
Expire After Five Years	1,154,966
Total	$ 12,549,154	$ 12,045,069