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Earnings per Common Share (Basic Earnings (Loss) Per Share) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended									6 Months Ended		12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Net income	$ 2,345			$ 2,022		$ 1,627	$ 1,894	$ 2,044	$ 963	$ 4,339	$ 3,827	$ 7,804	$ 6,528	$ 5,701
Weighted average common shares outstanding	4,234,291			4,227,992						4,234,525	4,227,362	4,229,284	4,106,548	3,495,705
Basic earnings per common share	$ 0.55	$ 0.49	$ 0.45	$ 0.48	$ 0.43	$ 0.35	$ 0.43	$ 0.46	$ 0.23	$ 1.02	$ 0.91	$ 1.85	$ 1.47	$ 1.53

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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