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Investments (Investment Gains and Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,409,626 | $ 1,401,301
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 11,038 | 5,401
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 150,619 | 185,741
Fixed maturity securities | 1,270,045 | 1,220,961
US Treasury Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 5,704 | 5,939
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 77 | 85
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 92 | 115
Fixed maturity securities | 5,689 | 5,909
US Government Agencies Debt Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,272 | 3,152
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 93 | 152
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Fixed maturity securities | 1,365 | 3,304
US States and Political Subdivisions Debt Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 293,634 | 300,757
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,904 | 1,087
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 27,754 | 33,542
Fixed maturity securities | 267,784 | 268,302
Corporate Debt Securities Financial Sector Member [Domain] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 296,501 | 272,925
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4,126 | 1,593
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 25,975 | 33,285
Fixed maturity securities | 274,652 | 241,233
Corporate Debt Security Consumer Sector |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 247,721 | 263,242
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,132 | 899
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 38,409 | 45,955
Fixed maturity securities | 210,444 | 218,186
Corporate Debt Security Utilities Sector |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 131,878 | 126,361
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 822 | 220
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 19,377 | 22,770
Fixed maturity securities | 113,323 | 103,811
Corporate Debt Security Energy Sector |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 83,805 | 79,247
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 303 | 40
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 7,430 | 9,959
Fixed maturity securities | 76,678 | 69,328
Corporate Debt Security Communications Sector |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 63,311 | 70,896
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 296 | 111
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 7,460 | 9,910
Fixed maturity securities | 56,147 | 61,097
Corporate Debt Security All Other Sector |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 130,248 | 117,387
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,369 | 315
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 15,214 | 16,368
Fixed maturity securities | 116,403 | 101,334
Commercial Mortgage Backed Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 308 | 315
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4 | 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 2 | 5
Fixed maturity securities | 310 | 311
Residential Mortgage Backed Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 105,767 | 106,661
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 13 | 7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 8,373 | 13,026
Fixed maturity securities | 97,407 | 93,642
Asset-backed Securities [Member] |  |
Gross Unrealized Gains and Losses [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 49,477 | 54,419
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 899 | 891
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 533 | 806
Fixed maturity securities | $ 49,843 | $ 54,504

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