Summary of Significant Accounting Policies - Summary of Computation of Basic and Diluted Earnings per Share (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income	$ 5,059,000	$ 1,253,000	$ 12,116,000	$ 4,071,000
Net (Income) loss attributable to noncontrolling interest	4,000	(3,000)	(1,000)	(21,000)
Net income available to common shareholders	$ 5,063,000	$ 1,250,000	$ 12,115,000	$ 4,050,000
Weighted average common shares	5,718,621	4,346,866	5,680,930	3,998,267
Effect of dilutive securities	0	0	0	0
Diluted average common shares	5,718,621	4,346,866	5,680,930	3,998,267
Earnings per common share	$ 0.88	$ 0.29	$ 2.13	$ 1.01
Diluted earnings per common share	$ 0.88	$ 0.29	$ 2.13	$ 1.01