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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 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity, Amortized Cost, Totals | $ 541,573 |  | $ 549,426
Held-to-Maturity, Allowance for Credit Losses | (276) | $ (290) | (195)
Held-to-Maturity, Carrying Amount | 541,297 |  | 549,231
Held-to-Maturity, Gross Unrecognized Gains | 2,374 |  | 27,032
Held-to-Maturity, Gross Unrecognized Losses | (18,034) |  | (413)
Held-to-Maturity, Fair Value | 525,637 |  | 575,850
States and Political Subdivisions [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity, Amortized Cost, Totals | 453,781 |  | 471,688
Held-to-Maturity, Allowance for Credit Losses | (44) | (45) | (48)
Held-to-Maturity, Carrying Amount | 453,737 |  | 471,640
Held-to-Maturity, Gross Unrecognized Gains | 2,160 |  | 25,175
Held-to-Maturity, Gross Unrecognized Losses | (14,707) |  | (263)
Held-to-Maturity, Fair Value | 441,190 |  | 496,552
Corporate Bonds [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity, Amortized Cost, Totals | 66,419 |  | 56,756
Held-to-Maturity, Allowance for Credit Losses | (228) | (241) | (143)
Held-to-Maturity, Carrying Amount | 66,191 |  | 56,613
Held-to-Maturity, Gross Unrecognized Gains | 37 |  | 1,344
Held-to-Maturity, Gross Unrecognized Losses | (3,073) |  | (114)
Held-to-Maturity, Fair Value | 63,155 |  | 57,843
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity, Amortized Cost, Totals | 4,102 |  | 4,623
Held-to-Maturity, Carrying Amount | 4,102 |  | 4,623
Held-to-Maturity, Gross Unrecognized Gains | 106 |  | 377
Held-to-Maturity, Gross Unrecognized Losses | (57) |  |
Held-to-Maturity, Fair Value | 4,151 |  | 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 | 17,182 |  | 16,251
Held-to-Maturity, Carrying Amount | 17,182 |  | 16,251
Held-to-Maturity, Gross Unrecognized Gains | 67 |  | 132
Held-to-Maturity, Gross Unrecognized Losses | (196) |  | (36)
Held-to-Maturity, Fair Value | 17,053 |  | 16,347
Asset-Backed Securities [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity, Amortized Cost, Totals | 89 |  | 108
Held-to-Maturity, Allowance for Credit Losses | (4) | $ (4) | (4)
Held-to-Maturity, Carrying Amount | 85 |  | 104
Held-to-Maturity, Gross Unrecognized Gains | 4 |  | 4
Held-to-Maturity, Gross Unrecognized Losses | (1) |  |
Held-to-Maturity, Fair Value | $ 88 |  | $ 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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