v3.26.1
Stock Based Compensation - Schedule of Changes in Stock Units (Detail) - $ / shares
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Balance at beginning of period 24,876 24,348
Grants 0 0
Vesting 0 0
Forfeited/expired 0 0
Balance at end of period 24,876 24,348
Balance at beginning of period $ 33.78 $ 30.91
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 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 81,707 71,656
Grants 0 0
Vesting 0 0
Forfeited/expired (1,299) (397)
Balance at end of period 80,408 71,259
Balance at beginning of period $ 34.91 $ 34.36
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 34.62 33.47
Balance at end of period $ 34.91 $ 34.36
Performance Shares [Member]    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Balance at beginning of period 115,681 96,206
Grants 0 0
Performance adjustment [1] 14,437 11,031
Vesting (43,329) (33,104)
Forfeited/expired (1,268) (614)
Balance at end of period 85,521 73,519
Balance at beginning of period $ 33.93 $ 35.83
Weighted Average Grant Date Fair Value, Grants 0 0
Weighted Average Grant Date Fair Value, Performance Adjustment [1] 29.53 47.19
Weighted Average Grant Date Fair Value, Vesting 29.53 47.19
Weighted Average Grant Date Fair Value, Forfeited/expired 35.48 32.59
Balance at end of period $ 35.4 $ 32.45
[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.