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Share-Based Compensation Plans - Share-Based Compensation Amounts Included in Net Income (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total compensation expense $ 7,622 $ 6,438 $ 5,945
Less: tax benefit (1,947) (1,663) (1,535)
Share-Based Compensation amounts included in net income 5,675 4,775 4,410
SICP Awards to Non-employee directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total compensation expense 906 959 782
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount 300    
SICP Awards to Key Employees      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested 22,500 24,100 28,800
Total compensation expense $ 6,716 $ 5,479 $ 5,163