Other Operating Expenses - Summary of Other Operating Expenses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Marketing	$ 2,132	$ 2,346	$ 2,315
Software maintenance/amortization	2,409	2,002	1,859
Legal and audit	1,514	1,444	1,543
Contributions	813	1,077	993
Processing services	1,875	1,740	1,160
Consulting	1,552	1,464	1,199
Postage and delivery	1,002	1,021	966
Supplies	985	987	945
Telephone	956	946	1,020
Directors' fees	414	438	440
Insurance	456	420	308
Pension	2,008	678	1,396
Other	1,786	1,725	1,845
Total	$ 17,902	$ 16,288	$ 15,989