Condensed Financial Information of Parent Company - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
ASSETS
Cash and due from non-affiliated banks	$ 4,851	$ 4,969
Interest-bearing deposits	7,501	15,330
Certificates of deposit	4,216	5,735
Other assets	4,099	3,682
Total assets	486,710	456,296
LIABILITIES
Subordinated debt	6,860	6,844
Other liabilities	3,117	2,864
Total liabilities	445,005	416,727
Total shareholders' equity	41,705	39,569	$ 39,238
Total liabilities and shareholders' equity	486,710	456,296
Parent Company
ASSETS
Cash and due from non-affiliated banks	990	149
Interest-bearing deposits	168	1,902
Certificates of deposit	1,240	2,480
Investments in subsidiaries	45,510	41,591
Other assets	1,680	1,920
Total assets	49,588	48,042
LIABILITIES
Subordinated debt	6,860	6,844
Deferred directors' compensation	561	477
Other liabilities	462	1,152
Total liabilities	7,883	8,473
Total shareholders' equity	41,705	39,569
Total liabilities and shareholders' equity	$ 49,588	$ 48,042