Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net income	$ 4,572	$ 17,865
Weighted average shares outstanding - basic and diluted (in shares)	5,118,698	5,117,347
Net income per common share - basic and diluted (in usd per share)	$ 0.89	$ 3.49