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Investments (Investment Gains and Losses) (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 1,385,121 $ 1,381,318
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 4,271 3,563
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 182,909 205,262
Fixed maturity securities, available-for-sale 1,206,483 1,179,619
US Treasury Securities [Member]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 5,710 9,425
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 88 152
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 29 9
Fixed maturity securities, available-for-sale 5,769 9,568
US Government Agencies Debt Securities [Member]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 3,419 3,434
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 268 277
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 3 1
Fixed maturity securities, available-for-sale 3,684 3,710
US States and Political Subdivisions Debt Securities [Member]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 331,708 344,208
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,581 1,114
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 31,482 37,964
Fixed maturity securities, available-for-sale 301,807 307,358
Corporate Debt Securities Financial Sector Member [Domain]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 248,462 243,758
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 408 512
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 38,843 42,383
Fixed maturity securities, available-for-sale 210,027 201,887
Corporate Debt Security Consumer Sector    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 249,961 247,824
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,184 758
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 42,172 47,138
Fixed maturity securities, available-for-sale 208,973 201,444
Corporate Debt Security Utilities Sector    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 119,216 115,738
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 98 39
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 22,330 23,790
Fixed maturity securities, available-for-sale 96,984 91,987
Corporate Debt Security Energy Sector    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 76,691 76,065
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 13 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 10,186 11,395
Fixed maturity securities, available-for-sale 66,518 64,670
Corporate Debt Security All Other Sector    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 186,470 184,022
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 572 683
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 25,439 29,048
Fixed maturity securities, available-for-sale 161,603 155,657
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 4 2
Fixed maturity securities, available-for-sale 167 169
Residential Mortgage Backed Securities [Member]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 110,439 110,582
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 6 9
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 10,062 10,765
Fixed maturity securities, available-for-sale 100,383 99,826
Asset-backed Securities [Member]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 52,774 45,991
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 53 18
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 2,359 2,767
Fixed maturity securities, available-for-sale 50,468 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 0 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0
Fixed maturity securities, available-for-sale $ 100 $ 101