Other Noninterest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Noninterest Expense [Abstract]
Advertising	$ 4,984	$ 2,693	$ 8,061	$ 5,050
Ad valorem and franchise taxes	3,519	2,340	6,555	4,643
Printing and supplies	1,330	1,065	2,508	2,176
Insurance expense	807	829	1,624	1,664
Travel expense	1,350	1,079	2,409	2,028
Entertainment and contributions	1,982	2,001	3,765	3,633
Tax credit investment amortization	1,213	1,833	2,425	3,576
Write-down for termination of FDIC loss share agreement	6,603		6,603
Other miscellaneous	5,879	4,633	12,347	10,412
Total other noninterest expense	$ 27,667	$ 16,473	$ 46,297	$ 33,182