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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

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