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Investments (Investment Gains and Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,409,351 | $ 1,401,301
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 7,371 | 5,401
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 169,294 | 185,741
Fixed maturity securities | 1,247,428 | 1,220,961
US Treasury Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 5,927 | 5,939
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 98 | 85
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 87 | 115
Fixed maturity securities | 5,938 | 5,909
US Government Agencies Debt Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,145 | 3,152
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 206 | 152
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Fixed maturity securities | 3,351 | 3,304
US States and Political Subdivisions Debt Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 298,351 | 300,757
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,402 | 1,087
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 29,317 | 33,542
Fixed maturity securities | 270,436 | 268,302
Corporate Debt Securities Financial Sector Member [Domain] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 270,073 | 272,925
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2,289 | 1,593
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 30,209 | 33,285
Fixed maturity securities | 242,153 | 241,233
Corporate Debt Security Consumer Sector |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 265,695 | 263,242
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,269 | 899
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 43,081 | 45,955
Fixed maturity securities | 223,883 | 218,186
Corporate Debt Security Utilities Sector |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 127,120 | 126,361
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 359 | 220
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 21,418 | 22,770
Fixed maturity securities | 106,061 | 103,811
Corporate Debt Security Energy Sector |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 80,513 | 79,247
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 92 | 40
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 9,168 | 9,959
Fixed maturity securities | 71,437 | 69,328
Corporate Debt Security Communications Sector |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 70,722 | 70,896
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 205 | 111
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 8,830 | 9,910
Fixed maturity securities | 62,097 | 61,097
Corporate Debt Security All Other Sector |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 126,765 | 117,387
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 472 | 315
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 16,315 | 16,368
Fixed maturity securities | 110,922 | 101,334
Commercial Mortgage Backed Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 313 | 315
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2 | 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 4 | 5
Fixed maturity securities | 311 | 311
Residential Mortgage Backed Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 106,538 | 106,661
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 5 | 7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 10,137 | 13,026
Fixed maturity securities | 96,406 | 93,642
Asset-backed Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 54,189 | 54,419
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 972 | 891
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 728 | 806
Fixed maturity securities | $ 54,433 | $ 54,504

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