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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, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule Of Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost, Totals | $ 480,362 | $ 491,927
Held-to-Maturity, Allowance for Credit Losses | (220) | (239)
Held-to-Maturity, Carrying Amount | 480,142 | 491,688
Held-to-Maturity, Gross Unrecognized Gains | 2,022 | 983
Held-to-Maturity, Gross Unrecognized Losses | (18,350) | (24,527)
Held To Maturity Securities Fair Value | 463,814 | 468,144
States and Political Subdivisions [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost, Totals | 412,038 | 415,136
Held-to-Maturity, Allowance for Credit Losses | (40) | (40)
Held-to-Maturity, Carrying Amount | 411,998 | 415,096
Held-to-Maturity, Gross Unrecognized Gains | 1,965 | 922
Held-to-Maturity, Gross Unrecognized Losses | (14,777) | (20,074)
Held To Maturity Securities Fair Value | 399,186 | 395,944
Corporate Bonds [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost, Totals | 53,528 | 59,903
Held-to-Maturity, Allowance for Credit Losses | (178) | (196)
Held-to-Maturity, Carrying Amount | 53,350 | 59,707
Held-to-Maturity, Gross Unrecognized Gains | 2 | 1
Held-to-Maturity, Gross Unrecognized Losses | (3,170) | (3,857)
Held To Maturity Securities Fair Value | 50,182 | 55,851
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost, Totals | 3,606 | 3,696
Held-to-Maturity, Carrying Amount | 3,606 | 3,696
Held-to-Maturity, Gross Unrecognized Gains | 30 | 33
Held-to-Maturity, Gross Unrecognized Losses | (126) | (153)
Held To Maturity Securities Fair Value | 3,510 | 3,576
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 | 11,125 | 13,123
Held-to-Maturity, Carrying Amount | 11,125 | 13,123
Held-to-Maturity, Gross Unrecognized Gains | 25 | 25
Held-to-Maturity, Gross Unrecognized Losses | (276) | (442)
Held To Maturity Securities Fair Value | 10,874 | 12,706
Asset-Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost, Totals | 65 | 69
Held-to-Maturity, Allowance for Credit Losses | (2) | (3)
Held-to-Maturity, Carrying Amount | 63 | 66
Held-to-Maturity, Gross Unrecognized Gains |  | 2
Held-to-Maturity, Gross Unrecognized Losses | (1) | (1)
Held To Maturity Securities Fair Value | $ 62 | $ 67

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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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