Noninterest Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Noninterest Expense [Abstract]
Employee compensation and benefits	$ 47,058	$ 45,636	$ 135,297	$ 139,502
Occupancy and equipment	9,959	11,034	29,385	32,253
Data processing	7,252	7,137	20,300	20,600
Professional Fees	3,093	4,929	12,030	12,718
Depreciation	3,358	2,918	9,350	8,754
Merger and acquisition	3,896	1,584	7,200	9,981
OREO operations	1,877	4,008	6,456	9,337
Advertising	1,830	3,442	6,025	10,370
Amortization of other intangible assets	1,676	1,792	5,046	4,988
FDIC insurance	1,129	2,159	4,693	6,005
Travel and entertainment	1,467	1,420	4,151	4,019
Other	2,739	3,349	9,008	7,137
Total noninterest expense	$ 85,334	$ 89,408	$ 248,941	$ 265,664