Other Noninterest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other Noninterest Expense [Abstract]
Advertising	$ 2,859	$ 2,856	$ 7,909	$ 7,154
Ad valorem and franchise taxes	2,268	2,868	6,911	8,319
Printing and supplies	1,134	1,193	3,310	3,568
Insurance expense	803	794	2,467	2,644
Travel expense	1,022	1,419	3,050	3,946
Entertainment and contributions	1,686	1,634	5,319	5,009
Tax credit investment amortization	861	2,161	4,437	6,352
Other miscellaneous	11,746	3,634	22,158	16,679
Total other noninterest expense	$ 22,379	$ 16,559	$ 55,561	$ 53,671