Other Noninterest Income and Other Noninterest Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other noninterest income:
Income from bank owned life insurance	$ 9,311	$ 5,219	$ 5,527
Safety deposit box income	1,591	841	794
Appraisal fee income	1,088	714	854
Letter of credit fees	4,193	1,451	1,309
Other	9,395	3,800	7,563
Total other noninterest income	25,578	12,025	16,047
Other noninterest expense:
Ad valorem and franchise taxes	5,330	3,568	3,621
Printing and supplies	5,608	2,380	1,911
Other fees	4,677	3,649	3,802
ORE expense	6,910	4,475	1,357
Insurance expense	7,490	2,010	1,905
Travel	3,590	2,137	1,152
Entertainment and contributions	3,954	1,651	1,346
Miscellaneous losses	8,781	1,080	1,663
Tax credit investment amortization	3,515
Other expense	18,081	8,942	5,634
Total other noninterest expense	$ 67,936	$ 29,892	$ 22,391