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Investments - Gross Unrecognized Gains and Losses and Cost or Amortized Cost, Allowance for Credit Losses, Carrying Amount and Fair Value of Investments Classified as Held-to-Maturity (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule Of Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost, Totals | $ 399,341 | $ 413,177
Held-to-Maturity, Allowance for Credit Losses | (100) | (116)
Held-to-maturity, Carrying Amount, Totals | 399,241 | 413,061
Held-to-Maturity, Gross Unrecognized Gains | 1,289 | 1,838
Held-to-Maturity, Gross Unrecognized Losses | (14,549) | (15,178)
Securities held-to-maturity-fixed maturity, Fair Value | $ 385,981 | $ 399,721
Investment, Type [Extensible Enumeration] | U.S. Agency-Based Mortgage-Backed Securities [Member] | U.S. Agency-Based Mortgage-Backed Securities [Member]
States and Political Subdivisions [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost, Totals | $ 360,026 | $ 368,056
Held-to-Maturity, Allowance for Credit Losses | (29) | (30)
Held-to-maturity, Carrying Amount, Totals | 359,997 | 368,026
Held-to-Maturity, Gross Unrecognized Gains | 1,250 | 1,810
Held-to-Maturity, Gross Unrecognized Losses | (13,333) | (13,568)
Securities held-to-maturity-fixed maturity, Fair Value | 347,914 | 356,268
Corporate Bonds [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost, Totals | 28,110 | 33,849
Held-to-Maturity, Allowance for Credit Losses | (71) | (86)
Held-to-maturity, Carrying Amount, Totals | 28,039 | 33,763
Held-to-Maturity, Gross Unrecognized Gains | 10 | 6
Held-to-Maturity, Gross Unrecognized Losses | (888) | (1,099)
Securities held-to-maturity-fixed maturity, Fair Value | 27,161 | 32,670
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost, Totals | 2,696 | 2,781
Held-to-maturity, Carrying Amount, Totals | 2,696 | 2,781
Held-to-Maturity, Gross Unrecognized Gains | 19 | 11
Held-to-Maturity, Gross Unrecognized Losses | (120) | (149)
Securities held-to-maturity-fixed maturity, Fair Value | 2,595 | 2,643
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost, Totals | 8,500 | 8,478
Held-to-maturity, Carrying Amount, Totals | 8,500 | 8,478
Held-to-Maturity, Gross Unrecognized Gains | 10 | 11
Held-to-Maturity, Gross Unrecognized Losses | (208) | (362)
Securities held-to-maturity-fixed maturity, Fair Value | 8,302 | 8,127
Asset-Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost, Totals | 9 | 13
Held-to-maturity, Carrying Amount, Totals | 9 | 13
Securities held-to-maturity-fixed maturity, Fair Value | $ 9 | $ 13

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- Definition Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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