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Investments (Investment Gains and Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,391,580 | $ 1,389,038
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 13,034 | 8,682
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 131,117 | 158,739
Fixed maturity securities, available-for-sale | 1,273,497 | 1,238,981
US Treasury Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 5,950 | 5,983
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 165 | 127
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 29 | 48
Fixed maturity securities, available-for-sale | 6,086 | 6,062
US Government Agencies Debt Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,380 | 3,404
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 287 | 250
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 1
Fixed maturity securities, available-for-sale | 3,667 | 3,653
US States and Political Subdivisions Debt Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 299,622 | 314,203
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2,531 | 2,160
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 23,940 | 29,132
Fixed maturity securities, available-for-sale | 278,213 | 287,231
Corporate Debt Securities Financial Sector Member [Domain] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 276,156 | 266,485
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4,152 | 2,066
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 24,177 | 31,255
Fixed maturity securities, available-for-sale | 256,131 | 237,296
Corporate Debt Security Consumer Sector |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 253,133 | 250,672
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2,358 | 2,145
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 32,726 | 37,094
Fixed maturity securities, available-for-sale | 222,765 | 215,723
Corporate Debt Security Utilities Sector |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 127,449 | 123,625
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,032 | 615
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 17,247 | 20,253
Fixed maturity securities, available-for-sale | 111,234 | 103,987
Corporate Debt Security Energy Sector |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 83,130 | 73,808
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 452 | 64
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 6,535 | 8,049
Fixed maturity securities, available-for-sale | 77,047 | 65,823
Corporate Debt Security Communications Sector |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 71,071 | 74,029
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 293 | 309
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 7,500 | 8,892
Fixed maturity securities, available-for-sale | 63,864 | 65,446
Corporate Debt Security All Other Sector |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 111,435 | 111,124
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 823 | 647
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 10,675 | 12,439
Fixed maturity securities, available-for-sale | 101,583 | 99,332
Commercial Mortgage Backed Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 268 | 171
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 2 | 0
Fixed maturity securities, available-for-sale | 267 | 171
Residential Mortgage Backed Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 106,816 | 107,174
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 14 | 9
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 7,633 | 10,060
Fixed maturity securities, available-for-sale | 99,197 | 97,123
Asset-backed Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 53,170 | 58,360
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 926 | 290
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 653 | 1,516
Fixed maturity securities, available-for-sale | $ 53,443 | $ 57,134

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