Commitments, Contingencies, and Guarantees - Credit Commitments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Credit Commitments [Line Items]
Credit Commitments	$ 3,115,800	$ 2,897,820
Unfunded Commitments to Extend Credit
Credit Commitments [Line Items]
Credit Commitments	2,973,153	2,787,123
Standby Letters of Credit
Credit Commitments [Line Items]
Credit Commitments	125,932	100,186
Commercial Letters of Credit
Credit Commitments [Line Items]
Credit Commitments	$ 16,715	$ 10,511