Commitments, Contingencies, and Guarantees (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Credit Commitments
Total Credit Commitments	$ 2,438,333	$ 2,389,486
Unfunded Commitments to Extend Credit
Credit Commitments
Total Credit Commitments	2,380,414	2,314,892
Standby Letters of Credit
Credit Commitments
Total Credit Commitments	42,024	58,207
Commercial Letters of Credit
Credit Commitments
Total Credit Commitments	$ 15,895	$ 16,387