Commitments, Contingencies, and Guarantees (Credit Commitments) (Details 1) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Credit Commitments [Line Items]
Credit Commitments	$ 2,947,171	$ 2,859,279
Unfunded Commitments to Extend Credit
Credit Commitments [Line Items]
Credit Commitments	2,869,256	2,780,724
Standby Letters of Credit
Credit Commitments [Line Items]
Credit Commitments	64,857	60,519
Commercial Letters of Credit
Credit Commitments [Line Items]
Credit Commitments	$ 13,058	$ 18,036