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Schedule I - Summary of Investments - Other Than Investments in Related Parties
 12 Months Ended
Dec. 31, 2021
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Abstract]  
Schedule I - Summary of Investments- Other than Investments in Related Parties
Types of investment
($ in thousands)Amortized Cost or CostFair ValueCarrying Amount
Fixed income securities:   
Held-to-maturity:   
Obligations of states and political subdivisions$3,442 3,576 3,440 
Public utilities1,345 1,368 1,352 
All other corporate securities24,067 24,516 23,993 
Total fixed income securities, held-to-maturity28,854 29,460 28,785 
Available-for-sale:   
U.S. government and government agencies127,974 130,458 130,458 
Foreign government 15,420 15,860 15,860 
Obligations of states and political subdivisions1,121,422 1,189,308 1,189,308 
Public utilities119,980 122,329 122,329 
All other corporate securities2,358,369 2,451,274 2,451,274 
Collateralized loan obligation securities and other asset-backed securities1,343,687 1,350,814 1,350,814 
Residential mortgage-backed securities756,280 776,252 776,252 
Commercial mortgage-backed securities647,621 673,681 673,681 
Total fixed income securities, available-for-sale6,490,753 6,709,976 6,709,976 
Equity securities:   
Common stock:   
Banks, trusts and insurance companies45,537 44,086 44,086 
Industrial, miscellaneous and all other261,343 289,363 289,363 
Nonredeemable preferred stock1,960 2,088 2,088 
Total equity securities308,840 335,537 335,537 
Commercial mortgage loans95,795 95,795 
Short-term investments447,862 447,863 
Other investments409,032  409,032 
Total investments$7,781,136  8,026,988 

See accompanying Report of Independent Registered Public Accounting Firm in Item 8. "Financial Statements and Supplementary Data." of this Form 10-K.