Other Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Other Assets [Abstract]
Cash surrender value of bank-owned life insurance	$ 278,863	$ 271,036
Accrued interest receivable	63,959	70,138
Accounts receivable	34,347	21,371
FHLB and FRB Stock	77,487	66,168
Private equity investments	29,361	31,876
Prepaid FDIC deposit insurance assessments	0	34,401
Other prepaid expenses	28,990	28,576
Derivative asset positions	40,004	64,662
Other properties held for sale	9,451	9,871
Miscellaneous other assets	53,914	62,279
Total other assets	$ 616,376	$ 660,378