Revenue from Contracts with Customers - Schedule of Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Non-interest Income
Service charges on deposit accounts	$ 1,569	$ 1,271	$ 3,050	$ 2,518
Wealth and asset management fees	1,202	1,090	2,244	2,120
Mortgage banking	370	310	609	518
Card processing and interchange income	1,221	1,103	2,250	2,074
Net gains (losses) on sales of securities	0	0	148	0
Other income	2,430	1,832	4,644	3,127
Total non-interest income	$ 6,792	$ 5,606	$ 12,945	$ 10,357