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Schedule of Amortized Cost and Estimated Fair Value of Company's Fixed Maturities Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | $ 1,341,934 | $ 1,394,639
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 3,989 | 2,205
Fixed maturities, Gross Unrealized losses | (9,579) | (14,936)
Fixed maturities, Estimated Fair Value | 1,336,344 | 1,381,908
U.S. Treasuries |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 572,608 | 875,273
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 38 | 757
Fixed maturities, Gross Unrealized losses | (265) | (784)
Fixed maturities, Estimated Fair Value | 572,381 | 875,246
Obligations of States and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 15,923 | 17,125
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 0 | 0
Fixed maturities, Gross Unrealized losses | (489) | (790)
Fixed maturities, Estimated Fair Value | 15,434 | 16,335
Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 216,275 | 61,905
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 1,216 | 299
Fixed maturities, Gross Unrealized losses | (2,500) | (3,284)
Fixed maturities, Estimated Fair Value | 214,991 | 58,920
Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 158,153 | 137,445
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 1,141 | 864
Fixed maturities, Gross Unrealized losses | (2,166) | (2,882)
Fixed maturities, Estimated Fair Value | 157,128 | 135,427
Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 66,382 | 68,041
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 395 | 15
Fixed maturities, Gross Unrealized losses | (1,573) | (2,488)
Fixed maturities, Estimated Fair Value | 65,204 | 65,568
Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 223,657 | 158,798
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 898 | 189
Fixed maturities, Gross Unrealized losses | (1,547) | (2,891)
Fixed maturities, Estimated Fair Value | 223,008 | 156,096
Foreign Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 88,936 | 76,052
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 301 | 81
Fixed maturities, Gross Unrealized losses | (1,039) | (1,817)
Fixed maturities, Estimated Fair Value | $ 88,198 | $ 74,316

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