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Investments - Investment Securities Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Marketable Securities [Line Items] |  |
Held-to-Maturity, Gross Unrealized Losses, Total | $ 18,474 | $ 657
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 196,433 | 67,825
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 10,625 | 657
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 63,424 |
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 7,849 |
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 259,857 | 67,825
Corporate Bonds [Member] |  |
Marketable Securities [Line Items] |  |
Held-to-Maturity, Gross Unrealized Losses, Total | 6,657 | 272
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 98,590 | 36,443
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 4,549 | 272
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 30,011 |
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 2,108 |
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 128,601 | 36,443
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Marketable Securities [Line Items] |  |
Held-to-Maturity, Gross Unrealized Losses, Total | 538 | 13
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 4,732 | 1,146
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 444 | 13
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 714 |
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 94 |
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 5,446 | 1,146
States and Political Subdivisions [Member] |  |
Marketable Securities [Line Items] |  |
Held-to-Maturity, Gross Unrealized Losses, Total | 9,826 | 240
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 87,522 | 23,465
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 5,319 | 240
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 24,980 |
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 4,507 |
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 112,502 | 23,465
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Marketable Securities [Line Items] |  |
Held-to-Maturity, Gross Unrealized Losses, Total | 1,453 | 132
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 5,589 | 6,771
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 313 | 132
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 7,719 |
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 1,140 |
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | $ 13,308 | $ 6,771

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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