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Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale $ 1,017,651 $ 607,572
Total fixed maturity securities, held-to-maturity 41,017 46,771
Equity securities, at fair value 118,249 120,169
Mortgage loans 50,070 52,842
Short-term investments 270,226 121,158
Total investments 1,497,213 948,512
U.S. government securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 44,166 48,541
Corporate securities and miscellaneous    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 383,420 235,129
Municipal securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 92,778 57,727
Residential mortgage-backed securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 281,626 119,856
Commercial mortgage-backed securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 29,934 36,495
Other asset-backed securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 185,727 109,824
Total fixed maturity securities, held-to-maturity 41,017 46,771
Total common stocks    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 67,425 55,996
Total common stocks | Consumer discretionary    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 2,313 1,948
Total common stocks | Consumer staples    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 14,015 12,036
Total common stocks | Industry Solutions    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 3,187 3,241
Total common stocks | Finance    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 24,267 22,636
Total common stocks | Industrial    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 12,170 9,452
Total common stocks | Information technology    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 5,192 2,284
Total common stocks | Materials    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 3,782 2,820
Total common stocks | Other    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 2,499 1,579
Total preferred stocks    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 7,358 8,771
Total preferred stocks | Consumer staples    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 433 117
Total preferred stocks | Finance    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 5,061 7,085
Total preferred stocks | Industrial    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 1,052 1,020
Total preferred stocks | Other    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 812 549
Total mutual funds    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 43,466 55,402
Total mutual funds | Fixed income    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 5,405 5,068
Total mutual funds | Equity    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 37,546 49,773
Total mutual funds | Commodity    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 515 561
Fair Value, Inputs, Level 1    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 44,166 48,541
Total fixed maturity securities, held-to-maturity 0 0
Equity securities, at fair value 110,891 111,398
Mortgage loans 0 0
Short-term investments 270,226 121,158
Total investments 425,283 281,097
Fair Value, Inputs, Level 1 | U.S. government securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 44,166 48,541
Fair Value, Inputs, Level 1 | Corporate securities and miscellaneous    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Fair Value, Inputs, Level 1 | Municipal securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Fair Value, Inputs, Level 1 | Residential mortgage-backed securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Fair Value, Inputs, Level 1 | Commercial mortgage-backed securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Fair Value, Inputs, Level 1 | Other asset-backed securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Total fixed maturity securities, held-to-maturity 0 0
Fair Value, Inputs, Level 1 | Total common stocks    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 67,425 55,996
Fair Value, Inputs, Level 1 | Total common stocks | Consumer discretionary    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 2,313 1,948
Fair Value, Inputs, Level 1 | Total common stocks | Consumer staples    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 14,015 12,036
Fair Value, Inputs, Level 1 | Total common stocks | Industry Solutions    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 3,187 3,241
Fair Value, Inputs, Level 1 | Total common stocks | Finance    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 24,267 22,636
Fair Value, Inputs, Level 1 | Total common stocks | Industrial    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 12,170 9,452
Fair Value, Inputs, Level 1 | Total common stocks | Information technology    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 5,192 2,284
Fair Value, Inputs, Level 1 | Total common stocks | Materials    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 3,782 2,820
Fair Value, Inputs, Level 1 | Total common stocks | Other    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 2,499 1,579
Fair Value, Inputs, Level 1 | Total preferred stocks    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 1 | Total preferred stocks | Consumer staples    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 1 | Total preferred stocks | Finance    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 1 | Total preferred stocks | Industrial    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 1 | Total preferred stocks | Other    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 1 | Total mutual funds    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 43,466 55,402
Fair Value, Inputs, Level 1 | Total mutual funds | Fixed income    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 5,405 5,068
Fair Value, Inputs, Level 1 | Total mutual funds | Equity    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 37,546 49,773
Fair Value, Inputs, Level 1 | Total mutual funds | Commodity    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 515 561
Fair Value, Inputs, Level 2    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 973,485 559,031
Total fixed maturity securities, held-to-maturity 0 0
Equity securities, at fair value 7,358 8,771
Mortgage loans 0 0
Short-term investments 0 0
Total investments 980,843 567,802
Fair Value, Inputs, Level 2 | U.S. government securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Fair Value, Inputs, Level 2 | Corporate securities and miscellaneous    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 383,420 235,129
Fair Value, Inputs, Level 2 | Municipal securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 92,778 57,727
Fair Value, Inputs, Level 2 | Residential mortgage-backed securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 281,626 119,856
Fair Value, Inputs, Level 2 | Commercial mortgage-backed securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 29,934 36,495
Fair Value, Inputs, Level 2 | Other asset-backed securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 185,727 109,824
Total fixed maturity securities, held-to-maturity 0 0
Fair Value, Inputs, Level 2 | Total common stocks    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 2 | Total common stocks | Consumer discretionary    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 2 | Total common stocks | Consumer staples    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 2 | Total common stocks | Industry Solutions    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 2 | Total common stocks | Finance    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 2 | Total common stocks | Industrial    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 2 | Total common stocks | Information technology    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 2 | Total common stocks | Materials    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 2 | Total common stocks | Other    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 2 | Total preferred stocks    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 7,358 8,771
Fair Value, Inputs, Level 2 | Total preferred stocks | Consumer staples    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 433 117
Fair Value, Inputs, Level 2 | Total preferred stocks | Finance    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 5,061 7,085
Fair Value, Inputs, Level 2 | Total preferred stocks | Industrial    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 1,052 1,020
Fair Value, Inputs, Level 2 | Total preferred stocks | Other    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 812 549
Fair Value, Inputs, Level 2 | Total mutual funds    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 2 | Total mutual funds | Fixed income    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 2 | Total mutual funds | Equity    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 2 | Total mutual funds | Commodity    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 3    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Total fixed maturity securities, held-to-maturity 41,017 46,771
Equity securities, at fair value 0 0
Mortgage loans 50,070 52,842
Short-term investments 0 0
Total investments 91,087 99,613
Fair Value, Inputs, Level 3 | U.S. government securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Fair Value, Inputs, Level 3 | Corporate securities and miscellaneous    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Fair Value, Inputs, Level 3 | Municipal securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Fair Value, Inputs, Level 3 | Residential mortgage-backed securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Fair Value, Inputs, Level 3 | Commercial mortgage-backed securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Fair Value, Inputs, Level 3 | Other asset-backed securities    
Fixed maturity securities, available-for-sale:    
Total fixed maturity securities, available-for-sale 0 0
Total fixed maturity securities, held-to-maturity 41,017 46,771
Fair Value, Inputs, Level 3 | Total common stocks    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 3 | Total common stocks | Consumer discretionary    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 3 | Total common stocks | Consumer staples    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 3 | Total common stocks | Industry Solutions    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 3 | Total common stocks | Finance    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 3 | Total common stocks | Industrial    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 3 | Total common stocks | Information technology    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 3 | Total common stocks | Materials    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 3 | Total common stocks | Other    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 3 | Total preferred stocks    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 3 | Total preferred stocks | Consumer staples    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 3 | Total preferred stocks | Finance    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 3 | Total preferred stocks | Industrial    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 3 | Total preferred stocks | Other    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 3 | Total mutual funds    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 3 | Total mutual funds | Fixed income    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 3 | Total mutual funds | Equity    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value 0 0
Fair Value, Inputs, Level 3 | Total mutual funds | Commodity    
Fixed maturity securities, available-for-sale:    
Equity securities, at fair value $ 0 $ 0