Condensed Financial Information of Parent Company - Condensed Statements of Cash Flows (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Cash Flows from Operating Activities:
Net income	$ 2,535	$ 366
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of debt issuance costs	16	10
Stock-based compensation	60	63
(Decrease) increase in other liabilities	506	351
Net cash provided by operating activities	3,899	2,587
Cash Flows from Investing Activities:
Maturities (purchases) of certificates of deposit	1,488	1,240
Net cash used in investing activities	(39,855)	(68,266)
Cash Flows from Financing Activities:
Proceeds from the issuance of subordinated debt		6,834
Repurchase of common stock		(243)
Net cash provided by financing activities	28,009	65,013
Net decrease in cash and due from banks	(7,947)	(666)
Parent Company
Cash Flows from Operating Activities:
Net income	2,535	366
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of debt issuance costs	16	10
Stock-based compensation	60	63
Equity in undistributed earnings of subsidiaries	(3,379)	(821)
Decrease (increase) in other assets	240	(187)
Net change in deferred directors' compensation	83	63
(Decrease) increase in other liabilities	(688)	1
Net cash provided by operating activities	(1,133)	(505)
Cash Flows from Investing Activities:
Maturities (purchases) of certificates of deposit	1,240	(2,480)
Investment in subsidiaries	(1,000)	(4,000)
Net cash used in investing activities	240	(6,480)
Cash Flows from Financing Activities:
Proceeds from the issuance of subordinated debt		6,834
Repurchase of common stock		(243)
Net cash provided by financing activities		6,591
Net decrease in cash and due from banks	(893)	(394)
Cash and cash equivalents at January 1	2,051	2,445
Cash and cash equivalents at December 31	$ 1,158	$ 2,051