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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
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]      
Expected tax provision at weighted average $ 414 $ 6,889 $ (7,975)
Adjustments:      
Tax exempt interest 0 0 (2)
Dividend exclusion (89) (78) (202)
Non-deductible interest 0 0 1,773
Change in tax status 700 0 (1,704)
Parent income treated as partnership for tax 2,156 (4,057) (533)
Other (360) 695 538
Total income tax expense (benefit) $ 2,821 $ 3,449 $ (8,105)
Expected tax provision at weighted average 21.00% 21.00% 27.40%
Adjustments:      
Tax exempt interest, % of Pre-Tax Income 0.00% 0.00% 0.00%
Dividend exclusion, % of Pre-Tax Income (4.50%) (0.20%) 0.70%
Non-deductible interest, % of Pre-Tax Income 0.00% 0.00% (6.10%)
Change in tax status, % of Pre-Tax Income 35.50% 0.00% 5.80%
Parent income treated as partnership for tax, % of Pre-Tax Income 109.40% (12.40%) 1.80%
Other, % of Pre-Tax Income (18.30%) 2.10% (1.80%)
Effective income tax expense (benefit) 143.10% 10.50% 27.80%