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Stock Based Compensation - Schedule of Changes in Stock Units (Detail) - $ / shares
 9 Months Ended
Sep. 30, 2025
Sep. 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 24,348
Vesting (24,348) (25,190)
Forfeited/expired 0 0
Balance at end of period 24,876 24,348
Balance at beginning of period $ 30.91 $ 27.79
Weighted Average Grant Date Fair Value, Grants 33.78 30.91
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 $ 30.91
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 43,923 45,064
Vesting (31,739) (24,075)
Forfeited/expired (971) (2,389)
Balance at end of period 82,869 72,417
Balance at beginning of period $ 34.36 $ 37.04
Weighted Average Grant Date Fair Value, Grants 36.43 34.37
Weighted Average Grant Date Fair Value, Vesting 35.84 40.35
Weighted Average Grant Date Fair Value, Forfeited/expired 33.63 34.8
Balance at end of period $ 34.9 $ 34.35
Performance Shares [Member]    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Balance at beginning of period 96,206 75,227
Grants 43,923 45,064
Performance adjustment [1] 11,031 0
Vesting (33,104) (20,532)
Forfeited/expired (1,244) (2,493)
Balance at end of period 116,812 97,266
Balance at beginning of period $ 35.83 $ 40.24
Weighted Average Grant Date Fair Value, Grants 36.43 34.37
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 $ 33.95 $ 35.82
[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.