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Investments (Investment Gains and Losses) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 1,387,919 $ 1,381,318
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 6,755 3,563
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 164,983 205,262
Fixed maturity securities, available-for-sale 1,229,691 1,179,619
US Treasury Securities [Member]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 5,720 9,425
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 215 152
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 10 9
Fixed maturity securities, available-for-sale 5,925 9,568
US Government Agencies Debt Securities [Member]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 3,427 3,434
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 337 277
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 1 1
Fixed maturity securities, available-for-sale 3,763 3,710
US States and Political Subdivisions Debt Securities [Member]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 334,887 344,208
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2,311 1,114
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 28,618 37,964
Fixed maturity securities, available-for-sale 308,580 307,358
Corporate Debt Securities Financial Sector Member [Domain]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 249,030 243,758
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 790 512
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 36,119 42,383
Fixed maturity securities, available-for-sale 213,701 201,887
Corporate Debt Security Consumer Sector    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 250,189 247,824
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,634 758
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 38,514 47,138
Fixed maturity securities, available-for-sale 213,309 201,444
Corporate Debt Security Utilities Sector    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 121,236 115,738
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 269 39
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 20,204 23,790
Fixed maturity securities, available-for-sale 101,301 91,987
Corporate Debt Security Energy Sector    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 74,564 76,065
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 42 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 8,840 11,395
Fixed maturity securities, available-for-sale 65,766 64,670
Corporate Debt Security All Other Sector    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 186,640 184,022
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 813 683
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 22,556 29,048
Fixed maturity securities, available-for-sale 164,897 155,657
Commercial Mortgage Backed Securities [Member]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 171 171
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 3 2
Fixed maturity securities, available-for-sale 168 169
Residential Mortgage Backed Securities [Member]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 110,579 110,582
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 10 9
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 7,686 10,765
Fixed maturity securities, available-for-sale 102,903 99,826
Asset-backed Securities [Member]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 51,376 45,991
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 333 18
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 2,432 2,767
Fixed maturity securities, available-for-sale 49,277 43,242
Foreign Government, Non-US [Member]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 100 100
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0
Fixed maturity securities, available-for-sale $ 101 $ 101