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Investments - Gross Unrealized Gains and Losses and Amortized Cost and Fair Value of Investments Classified as Held-to-Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule Of Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost, Totals | $ 491,927 | $ 549,426
Held-to-Maturity, Allowance for Credit Losses | (239) | (195)
Held-to-Maturity, Carrying Amount | 491,688 | 549,231
Held-to-Maturity, Gross Unrecognized Gains | 983 | 27,032
Held-to-Maturity, Gross Unrecognized Losses | (24,527) | (413)
Securities held-to-maturity-fixed maturity, Fair Value | 468,144 | 575,850
States and Political Subdivisions [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost, Totals | 415,136 | 471,688
Held-to-Maturity, Allowance for Credit Losses | (40) | (48)
Held-to-Maturity, Carrying Amount | 415,096 | 471,640
Held-to-Maturity, Gross Unrecognized Gains | 922 | 25,175
Held-to-Maturity, Gross Unrecognized Losses | (20,074) | (263)
Securities held-to-maturity-fixed maturity, Fair Value | 395,944 | 496,552
Corporate Bonds [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost, Totals | 59,903 | 56,756
Held-to-Maturity, Allowance for Credit Losses | (196) | (143)
Held-to-Maturity, Carrying Amount | 59,707 | 56,613
Held-to-Maturity, Gross Unrecognized Gains | 1 | 1,344
Held-to-Maturity, Gross Unrecognized Losses | (3,857) | (114)
Securities held-to-maturity-fixed maturity, Fair Value | 55,851 | 57,843
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost, Totals | 3,696 | 4,623
Held-to-Maturity, Carrying Amount | 3,696 | 4,623
Held-to-Maturity, Gross Unrecognized Gains | 33 | 377
Held-to-Maturity, Gross Unrecognized Losses | (153) |
Securities held-to-maturity-fixed maturity, Fair Value | 3,576 | 5,000
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 | 13,123 | 16,251
Held-to-Maturity, Carrying Amount | 13,123 | 16,251
Held-to-Maturity, Gross Unrecognized Gains | 25 | 132
Held-to-Maturity, Gross Unrecognized Losses | (442) | (36)
Securities held-to-maturity-fixed maturity, Fair Value | 12,706 | 16,347
Asset-Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost, Totals | 69 | 108
Held-to-Maturity, Allowance for Credit Losses | (3) | (4)
Held-to-Maturity, Carrying Amount | 66 | 104
Held-to-Maturity, Gross Unrecognized Gains | 2 | 4
Held-to-Maturity, Gross Unrecognized Losses | (1) |
Securities held-to-maturity-fixed maturity, Fair Value | $ 67 | $ 108

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aaa) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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