Schedule I. 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 or Amortized Cost	$ 1,945,307
Fair Value	1,883,761
Amounts at Which Shown in Balance Sheet	1,886,494
Total fixed maturities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	1,771,041
Fair Value	1,686,503
Amounts at Which Shown in Balance Sheet	1,686,502
United States Government and government agencies and authorities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	153,751
Fair Value	145,354
Amounts at Which Shown in Balance Sheet	145,354
States, municipalities and political subdivisions
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	618,686
Fair Value	614,759
Amounts at Which Shown in Balance Sheet	614,759
Foreign governments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	21,255
Fair Value	19,172
Amounts at Which Shown in Balance Sheet	19,172
Public utilities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	149,734
Fair Value	140,467
Amounts at Which Shown in Balance Sheet	140,467
All other bonds
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	827,615
Fair Value	766,751
Amounts at Which Shown in Balance Sheet	766,750
Total equity securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	29,238
Fair Value	55,019
Amounts at Which Shown in Balance Sheet	55,019
Public utilities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	656
Fair Value	3,993
Amounts at Which Shown in Balance Sheet	3,993
Banks, trusts and insurance companies
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	2,359
Fair Value	7,535
Amounts at Which Shown in Balance Sheet	7,535
Industrial, miscellaneous and all other
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	26,223
Fair Value	43,491
Amounts at Which Shown in Balance Sheet	43,491
Redeemable preferred stocks
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	0
Fair Value	0
Amounts at Which Shown in Balance Sheet	0
Nonredeemable preferred stocks
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	0
Fair Value	0
Amounts at Which Shown in Balance Sheet	0
Mortgage loans on real estate
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	45,421
Fair Value	42,632
Amounts at Which Shown in Balance Sheet	45,366
Policy loans
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	0
Fair Value	0
Amounts at Which Shown in Balance Sheet	0
Other long-term investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	99,507
Fair Value	99,507
Amounts at Which Shown in Balance Sheet	99,507
Short-term investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	100
Fair Value	100
Amounts at Which Shown in Balance Sheet	$ 100