Other Noninterest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Noninterest Expense [Abstract]
Advertising	$ 2,526	$ 3,077
Corporate value and franchise taxes	3,440	3,036
Printing and supplies	1,286	1,178
Travel expense	1,066	1,059
Entertainment and contributions	2,518	1,783
Tax credit investment amortization	874	1,212
Other retirement expense	(4,463)	(3,060)
Other miscellaneous	5,684	7,285
Total other noninterest expense	$ 12,931	$ 15,570