Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	$ 673,137	$ 607,572
Total fixed maturity securities, held-to-maturity	44,492	46,771
Equity securities, at fair value	120,465	120,169
Mortgage loans	42,335	52,842
Short-term investments	287,351	121,158
Total investments	1,167,780	948,512
U.S. government securities
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	44,918	48,541
Corporate securities and miscellaneous
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	262,434	235,129
Municipal securities
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	67,339	57,727
Residential mortgage-backed securities
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	133,890	119,856
Commercial mortgage-backed securities
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	52,182	36,495
Asset-backed securities
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	112,374	109,824
Total fixed maturity securities, held-to-maturity	44,492	46,771
Common stocks:
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	56,817	55,996
Common stocks: | Consumer discretionary
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	1,965	1,948
Common stocks: | Consumer staples
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	13,116	12,036
Common stocks: | Energy
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	2,947	3,241
Common stocks: | Finance
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	19,088	22,636
Common stocks: | Industrial
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	11,244	9,452
Common stocks: | Information technology
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	2,912	2,284
Common stocks: | Materials
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	3,253	2,820
Common stocks: | Other
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	2,292	1,579
Preferred stocks:
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	6,322	8,771
Preferred stocks: | Consumer staples
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	473	117
Preferred stocks: | Finance
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	3,979	7,085
Preferred stocks: | Industrial
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	1,135	1,020
Preferred stocks: | Other
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	735	549
Mutual funds:
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	57,326	55,402
Mutual funds: | Fixed income
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	5,191	5,068
Mutual funds: | Equity
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	51,615	49,773
Mutual funds: | Commodity
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	520	561
Level 1
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	44,918	48,541
Total fixed maturity securities, held-to-maturity	0	0
Equity securities, at fair value	114,143	111,398
Mortgage loans	0	0
Short-term investments	287,351	121,158
Total investments	446,412	281,097
Level 1 | U.S. government securities
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	44,918	48,541
Level 1 | Corporate securities and miscellaneous
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	0	0
Level 1 | Municipal securities
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	0	0
Level 1 | Residential mortgage-backed securities
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	0	0
Level 1 | Commercial mortgage-backed securities
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	0	0
Level 1 | 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
Level 1 | Common stocks:
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	56,817	55,996
Level 1 | Common stocks: | Consumer discretionary
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	1,965	1,948
Level 1 | Common stocks: | Consumer staples
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	13,116	12,036
Level 1 | Common stocks: | Energy
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	2,947	3,241
Level 1 | Common stocks: | Finance
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	19,088	22,636
Level 1 | Common stocks: | Industrial
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	11,244	9,452
Level 1 | Common stocks: | Information technology
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	2,912	2,284
Level 1 | Common stocks: | Materials
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	3,253	2,820
Level 1 | Common stocks: | Other
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	2,292	1,579
Level 1 | Preferred stocks:
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 1 | Preferred stocks: | Consumer staples
Fixed maturity securities, available-for-sale:
Equity securities, at fair value		0
Level 1 | Preferred stocks: | Finance
Fixed maturity securities, available-for-sale:
Equity securities, at fair value		0
Level 1 | Preferred stocks: | Industrial
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 1 | Preferred stocks: | Other
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 1 | Mutual funds:
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	57,326	55,402
Level 1 | Mutual funds: | Fixed income
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	5,191	5,068
Level 1 | Mutual funds: | Equity
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	51,615	49,773
Level 1 | Mutual funds: | Commodity
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	520	561
Level 2
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	628,219	559,031
Total fixed maturity securities, held-to-maturity	0	0
Equity securities, at fair value	6,322	8,771
Mortgage loans	0	0
Short-term investments	0	0
Total investments	634,541	567,802
Level 2 | U.S. government securities
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	0	0
Level 2 | Corporate securities and miscellaneous
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	262,434	235,129
Level 2 | Municipal securities
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	67,339	57,727
Level 2 | Residential mortgage-backed securities
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	133,890	119,856
Level 2 | Commercial mortgage-backed securities
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	52,182	36,495
Level 2 | Asset-backed securities
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	112,374	109,824
Total fixed maturity securities, held-to-maturity	0	0
Level 2 | Common stocks:
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 2 | Common stocks: | Consumer discretionary
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 2 | Common stocks: | Consumer staples
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 2 | Common stocks: | Energy
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 2 | Common stocks: | Finance
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 2 | Common stocks: | Industrial
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 2 | Common stocks: | Information technology
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 2 | Common stocks: | Materials
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 2 | Common stocks: | Other
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 2 | Preferred stocks:
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	6,322	8,771
Level 2 | Preferred stocks: | Consumer staples
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	473	117
Level 2 | Preferred stocks: | Finance
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	3,979	7,085
Level 2 | Preferred stocks: | Industrial
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	1,135	1,020
Level 2 | Preferred stocks: | Other
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	735	549
Level 2 | Mutual funds:
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 2 | Mutual funds: | Fixed income
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 2 | Mutual funds: | Equity
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 2 | Mutual funds: | Commodity
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 3
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	0	0
Total fixed maturity securities, held-to-maturity	44,492	46,771
Equity securities, at fair value	0	0
Mortgage loans	42,335	52,842
Short-term investments	0	0
Total investments	86,827	99,613
Level 3 | U.S. government securities
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	0	0
Level 3 | Corporate securities and miscellaneous
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	0	0
Level 3 | Municipal securities
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	0	0
Level 3 | Residential mortgage-backed securities
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	0	0
Level 3 | Commercial mortgage-backed securities
Fixed maturity securities, available-for-sale:
Total fixed maturity securities, available-for-sale	0	0
Level 3 | 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	44,492	46,771
Level 3 | Common stocks:
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 3 | Common stocks: | Consumer discretionary
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 3 | Common stocks: | Consumer staples
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 3 | Common stocks: | Energy
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 3 | Common stocks: | Finance
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 3 | Common stocks: | Industrial
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 3 | Common stocks: | Information technology
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 3 | Common stocks: | Materials
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 3 | Common stocks: | Other
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 3 | Preferred stocks:
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 3 | Preferred stocks: | Consumer staples
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 3 | Preferred stocks: | Finance
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 3 | Preferred stocks: | Industrial
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 3 | Preferred stocks: | Other
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 3 | Mutual funds:
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 3 | Mutual funds: | Fixed income
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 3 | Mutual funds: | Equity
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	0	0
Level 3 | Mutual funds: | Commodity
Fixed maturity securities, available-for-sale:
Equity securities, at fair value	$ 0	$ 0