Commitments and Contingencies (Credit-related Commitments) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Commitments to Extend Credit
Expire in One Year or Less	$ 174,475
Expire After Five Years	3,943
Total	309,616
Loan commitments
Commitments to Extend Credit
Expire in One Year or Less	3,282,433
Expire After One Year Through Three Years	123,780
Expire After Three Years Through Five Years	2,740,508
Expire After Five Years	764,677
Total	6,911,398	$ 5,690,917
Commercial letters of credit and SBLCs
Commitments to Extend Credit
Expire in One Year or Less	1,116,404
Expire After One Year Through Three Years	346,303
Expire After Three Years Through Five Years	119,356
Expire After Five Years	639,636
Total	2,221,699	2,240,813
Commitments to Extend Credit
Commitments to Extend Credit
Expire in One Year or Less	4,398,837
Expire After One Year Through Three Years	470,083
Expire After Three Years Through Five Years	2,859,864
Expire After Five Years	1,404,313
Total	$ 9,133,097	$ 7,931,730