Commitments, Contingencies, and Guarantees (Credit Commitments) (Details 1) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Credit Commitments [Line Items]
Credit Commitments	$ 2,678,793	$ 2,811,918
Unfunded Commitments to Extend Credit
Credit Commitments [Line Items]
Credit Commitments	2,579,748	2,713,937
Standby Letters of Credit
Credit Commitments [Line Items]
Credit Commitments	83,175	81,000
Commercial Letters of Credit
Credit Commitments [Line Items]
Credit Commitments	$ 15,870	$ 16,981