Business Combinations (Supplemental Pro Forma Information) (Detail) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Business Combinations [Abstract]
Net interest income		$ 18,448	$ 19,000
Net income	[1]	$ 2,295	$ 2,620
Basic and diluted weighted average shares outstanding	[2]	5,021,376	5,021,376
Basic and diluted earnings per common share		$ 0.46	$ 0.52

[1] Supplemental pro forma net income includes the impact of certain fair value adjustments. Supplemental pro forma net income does not include assumptions on cost savings or the impact of merger-related expenses.

[2] Weighted average shares outstanding includes the full effect of the common stock issued in connection with the Cardinal acquisition as of the earliest reporting date.