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Earnings Per Share - Calculation of Basic Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 4,723	$ 4,275	$ 6,180	$ 3,224	$ 3,193	$ 3,875	$ 4,114	$ 3,767	$ 18,402	$ 14,949	$ 12,720
Less: distributed earnings allocated to participating securities									(51)	(52)	(45)
Less: undistributed earnings allocated to participating securities									(87)	(98)	(77)
Net earnings available to common shareholders									$ 18,264	$ 14,799	$ 12,598
Weighted average common shares outstanding including participating securities									11,113,810	9,272,964	9,250,825
Less: average unvested restricted shares									(83,369)	(93,000)	(88,664)
Weighted average common shares outstanding	11,137,004	11,121,426	11,106,367	11,089,839	9,285,261	9,274,507	9,265,898	9,265,959	11,030,441	9,179,964	9,162,161
Basic and diluted earnings per share	$ 0.43	$ 0.38	$ 0.56	$ 0.29	$ 0.34	$ 0.42	$ 0.44	$ 0.41	$ 1.66	$ 1.61	$ 1.38

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units 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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