Stock Based Compensation - Summary of Vested and Unvested Restricted Stock Outstanding (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-Based Payment Arrangement [Abstract]
Balance at beginning of period	46,598	95,888	105,309
Grants	15,425	12,110	56,480
Vesting	(37,010)	(60,011)	(65,662)
Forfeited/expired	(200)	(1,389)	(239)
Balance at end of period	24,813	46,598	95,888
Balance at beginning of period	$ 35.75	$ 29.89	$ 29.93
Grants	40.89	49.58	29.22
Vesting	37.61	29.25	29.39
Forfeited/expired	29.70	32.76	29.70
Balance at end of period	$ 36.21	$ 35.75	$ 29.89