Compensation and Benefit Plans - Schedule of Stock Option Awards Activity and Related Information (Detail) - $ / shares		9 Months Ended		12 Months Ended
		Sep. 30, 2020		Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options, Outstanding, beginning of year		163,766	[1]	163,766
Options, Granted		40,000		8,918
Options, Forfeited				(8,918)
Options, Outstanding, end of year	[1]	203,766		163,766
Options, Exercisable, end of year	[1]	24,788		24,788
Weighted-Average Exercise Price Per Share, Outstanding, beginning of year		$ 12.78	[1]	$ 12.77
Weighted-Average Exercise Price Per Share, Granted		8.93		12.93
Weighted-Average Exercise Price Per Share, Forfeited				12.77
Weighted-Average Exercise Price Per Share, Outstanding, end of year	[1]	12.02		12.78
Weighted-Average Exercise Price Per Share, Exercisable, end of year	[1]	$ 12.77		$ 12.77

[1] The aggregate intrinsic value, which represents the difference between the price of the Company’s common stock at respective periods and the stated exercise price of the underlying options, was $0 and $315 for outstanding options and $0 and $48 for exercisable options at September 30, 2020 and December 31, 2019, respectively.