Commitments, Contingencies, and Guarantees (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Credit Commitments
Total Credit Commitments	$ 2,337,860	$ 2,075,456
Unfunded Commitments to Extend Credit
Credit Commitments
Total Credit Commitments	2,264,516	1,999,542
Standby Letters of Credit
Credit Commitments
Total Credit Commitments	57,843	62,043
Commercial Letters of Credit
Credit Commitments
Total Credit Commitments	$ 15,501	$ 13,871