Stock Based Compensation - Schedule of Changes in Stock Units (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Balance at beginning of period	46,598	95,888
Grants	15,425	12,110
Vesting	(23,898)	(31,081)
Forfeited/expired	(200)	(1,389)
Balance at end of period	37,925	75,528
Balance at beginning of period	$ 35.75	$ 29.89
Weighted Average Grant Date Fair Value, Grants	40.89	49.58
Weighted Average Grant Date Fair Value, Vesting	40.40	28.42
Weighted Average Grant Date Fair Value, Forfeited/expired	29.70	32.76
Balance at end of period	$ 34.94	$ 33.60
Restricted Stock Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Balance at beginning of period	22,597	0
Grants	24,833	22,597
Vesting	(7,425)	0
Forfeited/expired	(348)	0
Balance at end of period	39,657	22,597
Balance at beginning of period	$ 48.91	$ 0
Weighted Average Grant Date Fair Value, Grants	47.19	48.91
Weighted Average Grant Date Fair Value, Vesting	48.91	0
Weighted Average Grant Date Fair Value, Forfeited/expired	48.91	0
Balance at end of period	$ 47.83	$ 48.91
Performance Shares [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Balance at beginning of period	22,597
Grants	24,833	22,597
Forfeited/expired	(348)
Balance at end of period	47,082	22,597
Balance at beginning of period	$ 48.91
Weighted Average Grant Date Fair Value, Grants	47.19	$ 48.91
Weighted Average Grant Date Fair Value, Forfeited/expired	48.91
Balance at end of period	$ 48.00	$ 48.91