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Earnings Per Share - Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Numerator:
Income applicable to common shares	$ 6,606	$ 6,856	$ 6,580	$ 7,890	$ 8,089	$ 8,262	$ 7,776	$ 7,463	$ 27,932	$ 31,590	$ 16,824
Denominator:
Weighted average common shares outstanding (shares)									9,074	9,069	7,117
Effect of dilutive securities:
Weighted average common shares outstanding-assuming dilution (shares)									9,146	9,299	7,390
Earnings per common share (in usd per share)	$ 0.74	$ 0.76	$ 0.72	$ 0.86	$ 0.89	$ 0.91	$ 0.85	$ 0.83	$ 3.08	$ 3.48	$ 2.36
Earnings per common share-assuming dilution (in usd per share)	$ 0.73	$ 0.75	$ 0.72	$ 0.85	$ 0.87	$ 0.89	$ 0.83	$ 0.81	$ 3.05	$ 3.40	$ 2.28
Restricted Stock Awards
Effect of dilutive securities:
Restricted stock / Stock options (shares)									12	20	8
Stock Options
Effect of dilutive securities:
Restricted stock / Stock options (shares)									60	210	265

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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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