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Schedule of Amortized Cost and Estimated Fair Value of Company's Fixed Maturities Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | $ 1,362,384 | $ 1,322,092
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 1,406 | 1,580
Fixed maturities, Gross Unrealized losses | (23,744) | (29,879)
Fixed maturities, Estimated Fair Value | 1,340,046 | 1,293,793
U.S. Treasuries |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 764,718 | 497,099
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 18 | 515
Fixed maturities, Gross Unrealized losses | (2,585) | (3,391)
Fixed maturities, Estimated Fair Value | 762,151 | 494,223
Obligations of States and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 20,449 | 27,326
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 0 | 0
Fixed maturities, Gross Unrealized losses | (1,068) | (1,176)
Fixed maturities, Estimated Fair Value | 19,381 | 26,150
Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 58,825 | 63,173
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 510 | 229
Fixed maturities, Gross Unrealized losses | (3,972) | (4,475)
Fixed maturities, Estimated Fair Value | 55,363 | 58,927
Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 178,730 | 207,375
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 638 | 668
Fixed maturities, Gross Unrealized losses | (3,750) | (5,091)
Fixed maturities, Estimated Fair Value | 175,618 | 202,952
Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 76,904 | 84,062
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 16 | 12
Fixed maturities, Gross Unrealized losses | (4,159) | (4,994)
Fixed maturities, Estimated Fair Value | 72,761 | 79,080
Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 180,833 | 298,526
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 188 | 116
Fixed maturities, Gross Unrealized losses | (5,152) | (6,929)
Fixed maturities, Estimated Fair Value | 175,869 | 291,713
Foreign Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 81,925 | 144,531
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 36 | 40
Fixed maturities, Gross Unrealized losses | (3,058) | (3,823)
Fixed maturities, Estimated Fair Value | $ 78,903 | $ 140,748

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