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Securities - Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) $ in Thousands | Mar. 31, 2022 USD ($) Investments | Dec. 31, 2021 USD ($) Investments
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Debt Securities, Available-for-sale [Abstract] |  |
Number of investments | Investments | 123 | 21
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 1,069,359 | $ 304,779
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 40,013 | 1,791
Available-for-sale Securities, 12 Months or Longer, Fair Value | 4,876 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 121 |
Available-for-sale Securities, Fair Value, Total | 1,074,235 | 304,779
Available-for-sale Securities, Unrealized Losses, Total | $ 40,134 | $ 1,791
U.S. Treasuries [Member] |  |
Debt Securities, Available-for-sale [Abstract] |  |
Number of investments | Investments | 50 | 10
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 1,030,589 | $ 298,080
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 38,875 | 1,766
Available-for-sale Securities, 12 Months or Longer, Fair Value | 4,876 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 121 |
Available-for-sale Securities, Fair Value, Total | 1,035,465 | 298,080
Available-for-sale Securities, Unrealized Losses, Total | $ 38,996 | $ 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 | $ 403 | $ 376
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 2 | 2
Available-for-sale Securities, Fair Value, Total | 403 | 376
Available-for-sale Securities, Unrealized Losses, Total | $ 2 | $ 2
Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Abstract] |  |
Number of investments | Investments | 63 | 7
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 20,084 | $ 2,824
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 798 | 14
Available-for-sale Securities, Fair Value, Total | 20,084 | 2,824
Available-for-sale Securities, Unrealized Losses, Total | $ 798 | $ 14
States and Political Subdivisions [Member] |  |
Debt Securities, Available-for-sale [Abstract] |  |
Number of investments | Investments | 6 | 2
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 2,177 | $ 505
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 85 | 3
Available-for-sale Securities, Fair Value, Total | 2,177 | 505
Available-for-sale Securities, Unrealized Losses, Total | $ 85 | $ 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 | $ 13,280 |
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 79 |
Available-for-sale Securities, Fair Value, Total | 13,280 |
Available-for-sale Securities, Unrealized Losses, Total | $ 79 |
Other Securities [Member] |  |
Debt Securities, Available-for-sale [Abstract] |  |
Number of investments | Investments | 1 | 1
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 2,826 | $ 2,994
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 174 | 6
Available-for-sale Securities, Fair Value, Total | 2,826 | 2,994
Available-for-sale Securities, Unrealized Losses, Total | $ 174 | $ 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 http://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 http://asc.fasb.org/extlink&oid=123581744&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 http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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