Commitments and Contingencies - Credit-Related Commitments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Loan commitments
Commitments to Extend Credit
Expire in One Year or Less	$ 3,642,119
Expire After One Year Through Three Years	2,880,229
Expire After Three Years Through Five Years	963,277
Expire After Five Years	139,623
Total	7,625,248	$ 6,911,398
Commercial letters of credit and SBLCs
Commitments to Extend Credit
Expire in One Year or Less	1,080,377
Expire After One Year Through Three Years	342,243
Expire After Three Years Through Five Years	111,182
Expire After Five Years	732,561
Total	2,266,363	2,221,699
Commitments to Extend Credit
Commitments to Extend Credit
Expire in One Year or Less	4,722,496
Expire After One Year Through Three Years	3,222,472
Expire After Three Years Through Five Years	1,074,459
Expire After Five Years	872,184
Total	$ 9,891,611	$ 9,133,097