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Investments - Gross Unrealized Gains and Losses and Cost or Amortized Cost, Allowance for Credit Losses and Fair Value of Investments Classified as Available-for-sale (Detail) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale, Amortized Cost $ 318,975,000 $ 326,171,000
Available-for-sale, Gross Unrealized Gains 1,396,000 2,688,000
Available-for-sale, Gross Unrealized Losses (12,621,000) (11,795,000)
Available-for-sale fixed maturity, Fair Value 307,750,000 317,064,000
Available-for-sale securities, credit allowance 0 0
Fixed maturity securities, available-for-sale, allowance for credit losses 0 0
States and Political Subdivisions [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale, Amortized Cost 156,488,000 138,031,000
Available-for-sale, Gross Unrealized Gains 148,000 583,000
Available-for-sale, Gross Unrealized Losses (8,430,000) (6,719,000)
Available-for-sale fixed maturity, Fair Value 148,206,000 131,895,000
Corporate Bonds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale, Amortized Cost 143,070,000 168,134,000
Available-for-sale, Gross Unrealized Gains 1,248,000 2,105,000
Available-for-sale, Gross Unrealized Losses (2,783,000) (3,486,000)
Available-for-sale fixed maturity, Fair Value 141,535,000 166,753,000
U.S. Agency-Based Mortgage-Backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale, Amortized Cost 4,545,000 5,190,000
Available-for-sale, Gross Unrealized Losses (486,000) (445,000)
Available-for-sale fixed maturity, Fair Value 4,059,000 4,745,000
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale, Amortized Cost 14,872,000 14,816,000
Available-for-sale, Gross Unrealized Losses (922,000) (1,145,000)
Available-for-sale fixed maturity, Fair Value $ 13,950,000 $ 13,671,000