Commitments, Contingencies, and Guarantees - Credit Commitments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Credit Commitments [Line Items]
Credit Commitments	$ 2,951,110	$ 2,897,820
Unfunded Commitments to Extend Credit
Credit Commitments [Line Items]
Credit Commitments	2,837,258	2,787,123
Standby Letters of Credit
Credit Commitments [Line Items]
Credit Commitments	102,531	100,186
Commercial Letters of Credit
Credit Commitments [Line Items]
Credit Commitments	$ 11,321	$ 10,511