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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) (Detail) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
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Schedule Of Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost, Totals | $ 483,757,000 | $ 491,927,000
Held-to-Maturity, Allowance for Credit Losses | (182,000) | (239,000)
Held-to-Maturity, Carrying Amount | 483,575,000 | 491,688,000
Held-to-Maturity, Gross Unrecognized Gains | 4,218,000 | 983,000
Held-to-Maturity, Gross Unrecognized Losses | (14,701,000) | (24,527,000)
Securities held-to-maturity-fixed maturity, Fair Value | $ 473,092,000 | $ 468,144,000
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 | $ 416,916,000 | $ 415,136,000
Held-to-Maturity, Allowance for Credit Losses | (38,000) | (40,000)
Held-to-Maturity, Carrying Amount | 416,878,000 | 415,096,000
Held-to-Maturity, Gross Unrecognized Gains | 4,166,000 | 922,000
Held-to-Maturity, Gross Unrecognized Losses | (12,074,000) | (20,074,000)
Securities held-to-maturity-fixed maturity, Fair Value | 408,970,000 | 395,944,000
Corporate Bonds [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost, Totals | 52,321,000 | 59,903,000
Held-to-Maturity, Allowance for Credit Losses | (142,000) | (196,000)
Held-to-Maturity, Carrying Amount | 52,179,000 | 59,707,000
Held-to-Maturity, Gross Unrecognized Gains |  | 1,000
Held-to-Maturity, Gross Unrecognized Losses | (2,231,000) | (3,857,000)
Securities held-to-maturity-fixed maturity, Fair Value | 49,948,000 | 55,851,000
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost, Totals | 3,297,000 | 3,696,000
Held-to-Maturity, Carrying Amount | 3,297,000 | 3,696,000
Held-to-Maturity, Gross Unrecognized Gains | 25,000 | 33,000
Held-to-Maturity, Gross Unrecognized Losses | (123,000) | (153,000)
Securities held-to-maturity-fixed maturity, Fair Value | 3,199,000 | 3,576,000
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 | 11,186,000 | 13,123,000
Held-to-Maturity, Carrying Amount | 11,186,000 | 13,123,000
Held-to-Maturity, Gross Unrecognized Gains | 26,000 | 25,000
Held-to-Maturity, Gross Unrecognized Losses | (273,000) | (442)
Securities held-to-maturity-fixed maturity, Fair Value | 10,939,000 | 12,706,000
Asset-Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost, Totals | 37,000 | 69,000
Held-to-Maturity, Allowance for Credit Losses | (2,000) | (3,000)
Held-to-Maturity, Carrying Amount | 35,000 | 66,000
Held-to-Maturity, Gross Unrecognized Gains | 1,000 | 2,000
Held-to-Maturity, Gross Unrecognized Losses |  | (1,000)
Securities held-to-maturity-fixed maturity, Fair Value | $ 36,000 | $ 67,000

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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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- Definition Amount excluding accrued interest, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity), classified as current. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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