Stockholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended				6 Months Ended		10 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Aug. 30, 2016
Equity [Abstract]
Common stock repurchase authorized								$ 5,000,000
Repurchase of common stock, shares	54,768		0		133,208	0	187,384
Repurchase of common stock, value	$ 1,030,000				$ 2,536,955		$ 3,681,000
Common stock repurchase, average price per share	$ 18.80				$ 19.05		$ 19.64
Dividends declared, per share	0.17	$ 0.17	$ 0.17	$ 0.17	$ 0.34	$ 0.34
Dividends paid, per share	$ 0.17	$ 0.17	$ 0.17	$ 0.17
Dividend payments, amount	$ 1,971,000		$ 1,940,000		$ 3,942,474	$ 3,876,000