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INVESTMENTS - Fair Value of Investments (Details) - USD ($) | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Fixed Maturity, Available-for-sale |  |
Amortized Cost | $ 2,239,173,000 | $ 1,961,531,000
Gross Unrealized Gain | 23,900,000 | 3,640,000
Gross Unrealized Loss | 57,723,000 | 96,840,000
Allowance for Credit Losses | 0 | 0
Fair Value | 2,205,350,000 | 1,868,331,000
US Treasury and government agencies |  |
Fixed Maturity, Available-for-sale |  |
Amortized Cost | 109,358,000 | 126,402,000
Gross Unrealized Gain | 482,000 | 153,000
Gross Unrealized Loss | 5,736,000 | 9,255,000
Allowance for Credit Losses | 0 | 0
Fair Value | 104,104,000 | 117,301,000
States, municipalities and political subdivisions |  |
Fixed Maturity, Available-for-sale |  |
Amortized Cost | 261,711,000 | 252,936,000
Gross Unrealized Gain | 1,598,000 | 52,000
Gross Unrealized Loss | 1,575,000 | 5,084,000
Allowance for Credit Losses | 0 | 0
Fair Value | 261,734,000 | 247,904,000
Corporate |  |
Fixed Maturity, Available-for-sale |  |
Amortized Cost | 797,892,000 | 728,662,000
Gross Unrealized Gain | 9,186,000 | 1,354,000
Gross Unrealized Loss | 23,924,000 | 40,633,000
Allowance for Credit Losses | 0 | 0
Fair Value | 783,154,000 | 689,382,000
Residential mortgage-backed |  |
Fixed Maturity, Available-for-sale |  |
Amortized Cost | 732,452,000 | 623,431,000
Gross Unrealized Gain | 8,991,000 | 864,000
Gross Unrealized Loss | 25,846,000 | 40,884,000
Allowance for Credit Losses | 0 | 0
Fair Value | 715,597,000 | 583,411,000
Commercial mortgage-backed |  |
Fixed Maturity, Available-for-sale |  |
Amortized Cost | 143,009,000 | 102,975,000
Gross Unrealized Gain | 2,405,000 | 624,000
Gross Unrealized Loss | 7,000 | 44,000
Allowance for Credit Losses | 0 | 0
Fair Value | 145,407,000 | 103,554,000
Other asset-backed |  |
Fixed Maturity, Available-for-sale |  |
Amortized Cost | 194,751,000 | 127,125,000
Gross Unrealized Gain | 1,238,000 | 593,000
Gross Unrealized Loss | 635,000 | 940,000
Allowance for Credit Losses | 0 | 0
Fair Value | $ 195,354,000 | $ 126,779,000

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