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Differences in Tax Provision for Financial Statement Purposes and Expected Tax Provision at Weighted Average Tax Rate (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Income Tax Disclosure [Abstract]        
Expected tax provision at weighted average tax rate $ 2,662 $ 2,459 $ 5,657 $ 3,103
Adjustments:        
Non-deductible executive compensation 105 52 210 105
Dividend exclusion (22) (21) (38) (38)
Parent income treated as partnership for tax (172) (146) (366) (342)
Meals & Entertainment 20 63 37 129
Other (12) (36) (20) (13)
Total income tax expense $ 2,581 $ 2,371 $ 5,480 $ 2,944
Expected tax provision at weighted average 21.00% 21.00% 21.00% 21.00%
Adjustments:        
Non-deductible executive compensation, % of Pre-Tax Income 0.80% 0.40% 0.80% 0.70%
Dividend exclusion, % of Pre-Tax Income (0.20%) (0.20%) (0.10%) (0.30%)
Parent income treated as partnership for tax, % of Pre-Tax Income (1.30%) (1.20%) (1.40%) (2.30%)
Meals & Entertainment, % of Pre-Tax Income 0.20% 0.50% 0.10% 0.90%
Other, % of Pre-Tax Income (0.10%) (0.20%) (0.10%) (0.10%)
Effective income tax expense (benefit) 20.40% 20.30% 20.30% 19.90%