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Securities - Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) $ in Thousands | Sep. 30, 2022 USD ($) Investments | Dec. 31, 2021 USD ($) Investments
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Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 183 | 21
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 1,476,418 | $ 304,779
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 106,132 | 1,791
Available-for-sale Securities, 12 Months or Longer, Fair Value | 21,044 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 1,813 |
Available-for-sale Securities, Fair Value, Total | 1,497,462 | 304,779
Available-for-sale Securities, Unrealized Losses, Total | $ 107,945 | $ 1,791
U.S. Treasuries [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 73 | 10
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 1,440,283 | $ 298,080
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 102,906 | 1,766
Available-for-sale Securities, 12 Months or Longer, Fair Value | 18,807 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 1,524 |
Available-for-sale Securities, Fair Value, Total | 1,459,090 | 298,080
Available-for-sale Securities, Unrealized Losses, Total | $ 104,430 | $ 1,766
U.S. Federal Agencies [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 2 | 1
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 515 | $ 376
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 5 | 2
Available-for-sale Securities, Fair Value, Total | 515 | 376
Available-for-sale Securities, Unrealized Losses, Total | $ 5 | $ 2
Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 98 | 7
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 13,199 | $ 2,824
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 1,976 | 14
Available-for-sale Securities, 12 Months or Longer, Fair Value | 2,042 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 283 |
Available-for-sale Securities, Fair Value, Total | 15,241 | 2,824
Available-for-sale Securities, Unrealized Losses, Total | $ 2,259 | $ 14
States and Political Subdivisions [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 7 | 2
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 2,049 | $ 505
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 250 | 3
Available-for-sale Securities, 12 Months or Longer, Fair Value | 195 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 6 |
Available-for-sale Securities, Fair Value, Total | 2,244 | 505
Available-for-sale Securities, Unrealized Losses, Total | $ 256 | $ 3
Asset backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 1 |
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 12,968 |
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 399 |
Available-for-sale Securities, Fair Value, Total | 12,968 |
Available-for-sale Securities, Unrealized Losses, Total | $ 399 |
Other Securities [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 2 | 1
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 7,404 | $ 2,994
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 596 | 6
Available-for-sale Securities, Fair Value, Total | 7,404 | 2,994
Available-for-sale Securities, Unrealized Losses, Total | $ 596 | $ 6

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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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