SEC Schedule, Article 12-15, Summary of Investments - Other than Investments in Related Parties (Details) $ in Thousands	Dec. 31, 2023 USD ($)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	$ 1,518,431
Fair Value (if applicable)	1,501,011
Amount on Balance Sheet	1,502,980
Fixed maturity securities, available for sale:
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	1,047,713
Fair Value (if applicable)	1,017,651
Amount on Balance Sheet	1,017,651
Fixed maturity securities, available for sale: | U.S. government securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	44,685
Fair Value (if applicable)	44,166
Amount on Balance Sheet	44,166
Fixed maturity securities, available for sale: | Corporate securities and miscellaneous
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	392,773
Fair Value (if applicable)	383,420
Amount on Balance Sheet	383,420
Fixed maturity securities, available for sale: | Municipal securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	98,266
Fair Value (if applicable)	92,778
Amount on Balance Sheet	92,778
Fixed maturity securities, available for sale: | Residential mortgage-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	292,568
Fair Value (if applicable)	281,626
Amount on Balance Sheet	281,626
Fixed maturity securities, available for sale: | Commercial mortgage-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	31,411
Fair Value (if applicable)	29,934
Amount on Balance Sheet	29,934
Fixed maturity securities, available for sale: | Other asset-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	188,010
Fair Value (if applicable)	185,727
Amount on Balance Sheet	185,727
Fixed maturity securities, held to maturity:
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	43,315
Fair Value (if applicable)	41,017
Amount on Balance Sheet	42,986
Fixed maturity securities, held to maturity: | Other asset-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	43,315
Fair Value (if applicable)	41,017
Amount on Balance Sheet	42,986
Equity securities:
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	102,837
Fair Value (if applicable)	118,249
Amount on Balance Sheet	118,249
Equity securities: | Common stocks
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	54,672
Fair Value (if applicable)	67,425
Amount on Balance Sheet	67,425
Equity securities: | Preferred stocks
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	8,736
Fair Value (if applicable)	7,358
Amount on Balance Sheet	7,358
Equity securities: | Mutual funds
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	39,429
Fair Value (if applicable)	43,466
Amount on Balance Sheet	43,466
Mortgage loans
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	50,542
Fair Value (if applicable)	50,070
Amount on Balance Sheet	50,070
Other long-term investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	3,798
Fair Value (if applicable)	3,798
Amount on Balance Sheet	3,798
Short-term investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	270,226
Fair Value (if applicable)	270,226
Amount on Balance Sheet	$ 270,226