Stock Based Compensation - Schedule of Changes in Stock Units (Detail) - $ / shares		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Balance at beginning of period		24,348	25,190
Grants		24,876	22,950
Vesting		(24,348)	(25,190)
Forfeited/expired		0	0
Balance at end of period		24,876	22,950
Balance at beginning of period		$ 30.91	$ 27.79
Weighted Average Grant Date Fair Value, Grants		33.78	30.51
Weighted Average Grant Date Fair Value, Vesting		30.91	27.79
Weighted Average Grant Date Fair Value, Forfeited/expired		0	0
Balance at end of period		$ 33.78	$ 30.51
Restricted Stock Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Balance at beginning of period		71,656	53,817
Grants		0	0
Vesting		0	0
Forfeited/expired		(971)	(2,389)
Balance at end of period		70,685	51,428
Balance at beginning of period		$ 34.36	$ 37.04
Weighted Average Grant Date Fair Value, Grants		0	0
Weighted Average Grant Date Fair Value, Vesting		0	0
Weighted Average Grant Date Fair Value, Forfeited/expired		33.63	34.8
Balance at end of period		$ 34.37	$ 37.14
Performance Shares [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Balance at beginning of period		96,206	75,227
Grants		0	0
Performance adjustment	[1]	11,031	0
Vesting		(33,104)	(20,532)
Forfeited/expired		(1,244)	(2,493)
Balance at end of period		72,889	52,202
Balance at beginning of period		$ 35.83	$ 40.24
Weighted Average Grant Date Fair Value, Grants		0	0
Weighted Average Grant Date Fair Value, Performance Adjustment	[1]	47.19	0
Weighted Average Grant Date Fair Value, Vesting		47.19	48.91
Weighted Average Grant Date Fair Value, Forfeited/expired		32.17	35.21
Balance at end of period		$ 32.45	$ 37.07

[1] PSUs are presented as outstanding, granted and forfeited in the table above assuming targets are met and the awards pay out at 100%. PSU awards are settled with payouts ranging from 0% to 200% of the target award value based on the Company's performance relative to a predefined peer group over a fixed three-year performance period. The performance adjustment represents the difference in shares ultimately awarded due to performance attainment above or below target.