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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 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity, Amortized Cost, Totals | $ 436,505 |  | $ 483,757
Held-to-Maturity, Allowance for Credit Losses | (136) | $ (149) | (182)
Held-to-Maturity, Carrying Amount | 436,369 |  | 483,575
Held-to-Maturity, Gross Unrecognized Gains | 4,266 |  | 4,218
Held-to-Maturity, Gross Unrecognized Losses | (10,282) |  | (14,701)
Securities held-to-maturity-fixed maturity, Fair Value | $ 430,353 |  | $ 473,092
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 | $ 387,702 |  | $ 416,916
Held-to-Maturity, Allowance for Credit Losses | (35) | (36) | (38)
Held-to-Maturity, Carrying Amount | 387,667 |  | 416,878
Held-to-Maturity, Gross Unrecognized Gains | 4,190 |  | 4,166
Held-to-Maturity, Gross Unrecognized Losses | (9,006) |  | (12,074)
Securities held-to-maturity-fixed maturity, Fair Value | 382,851 |  | 408,970
Corporate Bonds [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity, Amortized Cost, Totals | 37,453 |  | 52,321
Held-to-Maturity, Allowance for Credit Losses | (100) | (111) | (142)
Held-to-Maturity, Carrying Amount | 37,353 |  | 52,179
Held-to-Maturity, Gross Unrecognized Gains | 12 |  |
Held-to-Maturity, Gross Unrecognized Losses | (1,094) |  | (2,231)
Securities held-to-maturity-fixed maturity, Fair Value | 36,271 |  | 49,948
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity, Amortized Cost, Totals | 2,877 |  | 3,297
Held-to-Maturity, Carrying Amount | 2,877 |  | 3,297
Held-to-Maturity, Gross Unrecognized Gains | 33 |  | 25
Held-to-Maturity, Gross Unrecognized Losses | (81) |  | (123)
Securities held-to-maturity-fixed maturity, Fair Value | 2,829 |  | 3,199
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 | 8,456 |  | 11,186
Held-to-Maturity, Carrying Amount | 8,456 |  | 11,186
Held-to-Maturity, Gross Unrecognized Gains | 31 |  | 26
Held-to-Maturity, Gross Unrecognized Losses | (101) |  | (273)
Securities held-to-maturity-fixed maturity, Fair Value | 8,386 |  | 10,939
Asset-Backed Securities [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity, Amortized Cost, Totals | 17 |  | 37
Held-to-Maturity, Allowance for Credit Losses | (1) | $ (2) | (2)
Held-to-Maturity, Carrying Amount | 16 |  | 35
Held-to-Maturity, Gross Unrecognized Gains |  |  | 1
Held-to-Maturity, Gross Unrecognized Losses |  |  | 0
Securities held-to-maturity-fixed maturity, Fair Value | $ 16 |  | $ 36

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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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