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Difference Between Actual Income Tax Expense and Differences from the Income Tax Calculated at the Statutory U S Federal Tax Rate (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]      
U.S. federal income tax at statutory rate $ 11,541 $ 6,925 $ 414
Adjustments:      
Non-deductible executive compensation 420 1,753 0
Dividend exclusion (61) (76) (89)
Meals & entertainment 56 0 0
Change in tax status 0 0 700
Parent income treated as partnership for tax (934) (1,260) 2,156
Transaction costs 653 0 0
Other 40 205 (360)
Total income tax expense $ 11,715 $ 7,547 $ 2,821
U.S. federal income tax at statutory rate, % of Pre-Tax Income 21.00% 21.00% 21.00%
Adjustments:      
Non-deductible executive compensation, % of Pre-Tax Income 0.70% 5.30% 0.00%
Dividend exclusion, % of Pre-Tax Income (0.10%) (0.20%) (4.50%)
Meals & entertainment, % of Pre-Tax Income 0.10% 0.00% 0.00%
Change in tax status, % of Pre-Tax Income 0.00% 0.00% 35.50%
Parent income treated as partnership for tax, % of Pre-Tax Income (1.70%) (3.80%) 109.40%
Transaction costs, % of Pre-Tax Income 1.20% 0.00% 0.00%
Other, % of Pre-Tax Income 0.10% 0.60% (18.30%)
Income tax expense 21.30% 22.90% 143.10%