Other Operating Expenses - Schedule of Other Operating Expenses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Costs And Expenses [Abstract]
Franchise and other miscellaneous taxes	$ 12,813	$ 9,847	$ 8,423
Consulting, regulatory and advisory fees	8,993	6,976	6,857
ATM and electronic banking interchange expenses	6,931	5,718	4,510
Postage and courier expenses	5,334	4,143	3,879
Supplies	4,499	3,180	3,033
Legal fees	3,054	2,778	2,781
Communications	3,720	2,569	2,487
Other real estate owned and foreclosure expenses	397	831	1,097
Other	16,915	14,679	12,263
Total other operating expenses	$ 62,656	$ 50,721	$ 45,330