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Investments (Investment Gains and Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,389,390 | $ 1,381,318
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3,321 | 3,563
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 241,358 | 205,262
Fixed maturity securities, available-for-sale | 1,151,353 | 1,179,619
US Treasury Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 5,700 | 9,425
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 241 | 152
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 114 | 9
Fixed maturity securities, available-for-sale | 5,827 | 9,568
US Government Agencies Debt Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,411 | 3,434
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 122 | 277
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 3 | 1
Fixed maturity securities, available-for-sale | 3,530 | 3,710
US States and Political Subdivisions Debt Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 325,314 | 344,208
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,607 | 1,114
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 42,965 | 37,964
Fixed maturity securities, available-for-sale | 283,956 | 307,358
Corporate Debt Securities Financial Sector Member [Domain] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 256,108 | 243,758
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 149 | 512
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 48,576 | 42,383
Fixed maturity securities, available-for-sale | 207,681 | 201,887
Corporate Debt Security Consumer Sector |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 249,857 | 247,824
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 545 | 758
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 54,802 | 47,138
Fixed maturity securities, available-for-sale | 195,600 | 201,444
Corporate Debt Security Utilities Sector |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 121,874 | 115,738
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1 | 39
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 28,583 | 23,790
Fixed maturity securities, available-for-sale | 93,292 | 91,987
Corporate Debt Security Energy Sector |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 76,418 | 76,065
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 13,304 | 11,395
Fixed maturity securities, available-for-sale | 63,114 | 64,670
Corporate Debt Security All Other Sector |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 184,859 | 184,022
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 236 | 683
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 34,041 | 29,048
Fixed maturity securities, available-for-sale | 151,054 | 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 | 108,976 | 110,582
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3 | 9
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 16,460 | 10,765
Fixed maturity securities, available-for-sale | 92,519 | 99,826
Asset-backed Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 56,702 | 45,991
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 417 | 18
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 2,506 | 2,767
Fixed maturity securities, available-for-sale | $ 54,613 | 43,242
Foreign Government, Non-US [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 100
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 0
Fixed maturity securities, available-for-sale |  | $ 101

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