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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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Income Tax Disclosure [Abstract]        
Expected tax provision at weighted average tax rate $ 3,336 $ 1,987 $ 8,993 $ 5,090
Adjustments:        
Non-deductible executive compensation 105 53 315 158
Dividend exclusion (16) (16) (54) (54)
Parent income treated as partnership for tax (324) (326) (690) (668)
Meals & Entertainment 7 68 44 197
Other 17 (3) (3) (16)
Total income tax expense $ 3,125 $ 1,763 $ 8,605 $ 4,707
Expected tax provision at weighted average 21.00% 21.00% 21.00% 21.00%
Adjustments:        
Non-deductible executive compensation, % of Pre-Tax Income 0.70% 0.60% 0.70% 0.70%
Dividend exclusion, % of Pre-Tax Income (0.10%) (0.20%) (0.10%) (0.20%)
Parent income treated as partnership for tax, % of Pre-Tax Income (2.00%) (3.40%) (1.60%) (2.80%)
Meals & Entertainment, % of Pre-Tax Income 0.00% 0.70% 0.10% 0.80%
Other, % of Pre-Tax Income 0.10% (0.10%) 0.00% (0.10%)
Effective income tax expense (benefit) 19.70% 18.60% 20.10% 19.40%