Noninterest Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Noninterest Expense [Abstract]
Employee compensation and benefits									$ 181,544	$ 189,025	$ 171,643
OREO operations									7,389	11,829	41,500
Occupancy and equipment									39,935	42,930	39,878
Data processing									27,984	27,091	24,171
FDIC insurance									5,827	7,493	14,328
Professional Fees									16,143	16,691	13,902
Depreciation									13,093	11,690	12,184
Advertising									7,942	12,688	10,017
Travel and entertainment									5,911	5,756	5,420
Merger and acquisition									10,837	11,976	1,012
Amortization of other intangible assets									6,799	6,780	4,851
Other									9,908	11,304	13,484
Total noninterest expense	$ 84,371	$ 85,334	$ 81,678	$ 81,929	$ 89,589	$ 89,408	$ 87,607	$ 88,649	$ 333,312	$ 355,253	$ 352,390