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Securities - Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) $ in Thousands | Jun. 30, 2022 USD ($) Investments | Dec. 31, 2021 USD ($) Investments
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Debt Securities, Available-for-sale [Abstract] |  |
Number of investments | Investments | 140 | 21
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 1,146,136 | $ 304,779
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 61,139 | 1,791
Available-for-sale Securities, 12 Months or Longer, Fair Value | 5,705 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 211 |
Available-for-sale Securities, Fair Value, Total | 1,151,841 | 304,779
Available-for-sale Securities, Unrealized Losses, Total | $ 61,350 | $ 1,791
U.S. Treasuries [Member] |  |
Debt Securities, Available-for-sale [Abstract] |  |
Number of investments | Investments | 58 | 10
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 1,112,058 | $ 298,080
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 58,843 | 1,766
Available-for-sale Securities, 12 Months or Longer, Fair Value | 4,853 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 144 |
Available-for-sale Securities, Fair Value, Total | 1,116,911 | 298,080
Available-for-sale Securities, Unrealized Losses, Total | $ 58,987 | $ 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 | $ 363 | $ 376
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 1 | 2
Available-for-sale Securities, Fair Value, Total | 363 | 376
Available-for-sale Securities, Unrealized Losses, Total | $ 1 | $ 2
Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Abstract] |  |
Number of investments | Investments | 71 | 7
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 15,971 | $ 2,824
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 1,368 | 14
Available-for-sale Securities, 12 Months or Longer, Fair Value | 657 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 61 |
Available-for-sale Securities, Fair Value, Total | 16,628 | 2,824
Available-for-sale Securities, Unrealized Losses, Total | $ 1,429 | $ 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 | $ 2,135 | $ 505
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 173 | 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 | 2,330 | 505
Available-for-sale Securities, Unrealized Losses, Total | $ 179 | $ 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 | $ 12,877 |
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 486 |
Available-for-sale Securities, Fair Value, Total | 12,877 |
Available-for-sale Securities, Unrealized Losses, Total | $ 486 |
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 | $ 2,732 | $ 2,994
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 268 | 6
Available-for-sale Securities, Fair Value, Total | 2,732 | 2,994
Available-for-sale Securities, Unrealized Losses, Total | $ 268 | $ 6

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