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Schedule I - Summary of Investments - Other Than Investments in Related Parties
 12 Months Ended
Dec. 31, 2020
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$4,505 4,795 4,507 
Public utilities2,436 2,579 2,464 
All other corporate securities9,898 10,627 9,853 
Total fixed income securities, held-to-maturity16,839 18,001 16,824 
Available-for-sale:   
U.S. government and government agencies110,038 116,140 116,140 
Foreign government 16,801 18,366 18,366 
Obligations of states and political subdivisions1,159,588 1,247,137 1,247,137 
Public utilities68,269 73,821 73,821 
All other corporate securities2,083,934 2,254,231 2,254,231 
Collateralized loan obligation securities and other asset-backed securities1,014,820 1,026,551 1,026,551 
Residential mortgage-backed securities999,485 1,051,788 1,051,788 
Commercial mortgage-backed securities620,582 667,894 667,894 
Total fixed income securities, available-for-sale6,073,517 6,455,928 6,455,928 
Equity securities:   
Common stock:   
Banks, trusts and insurance companies18,366 17,474 17,474 
Industrial, miscellaneous and all other281,619 291,158 291,158 
Nonredeemable preferred stock1,566 1,735 1,735 
Total equity securities301,551 310,367 310,367 
Commercial mortgage loans46,306 46,306 
Short-term investments409,865 409,852 
Other investments266,322  266,322 
Total investments$7,114,400  7,505,599 

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