Incentive Compensation Plan - Unvested Service-Based Restricted Stock Awards (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, beginning of the year, Shares	250,800	171,500	137,500
Granted, Shares	134,515	95,300	78,000
Vested, Shares	(88,389)	(12,000)	(41,000)
Forfeited, Shares	(10,911)	(4,000)	(3,000)
Outstanding, end of the year, Shares	286,015	250,800	171,500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding, beginning of the year, Weighted Average Grant Date Fair Value	$ 14.13	$ 14.27	$ 13.05
Grant Price (in dollars per share)	13.64	13.72	14.22
Vested, Weighted Average Grant Date Fair Value	14.46	12.99	10.09
Forfeited, Weighted Average Grant Date Fair Value	13.66	13.85	14.40
Outstanding, end of the year, Weighted Average Grant Date Fair Value	$ 13.82	$ 14.13	$ 14.27