Other Operating Expenses - Schedule of Other Operating Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Costs and Expenses [Abstract]
Franchise and other miscellaneous taxes	$ 6,825	$ 5,924	$ 6,748
Consulting, regulatory and advisory fees	6,270	4,959	4,405
ATM and electronic banking interchange expenses	4,297	4,463	4,222
Postage and courier expenses	3,306	3,720	3,373
Supplies	2,919	2,841	2,425
Legal fees	2,406	2,418	2,531
Communications	1,800	1,537	1,555
Other real estate owned and foreclosure expenses	1,210	546	1,101
Other	11,967	12,479	10,836
Total other operating expenses	$ 41,000	$ 38,887	$ 37,196