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Securities - Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) $ in Thousands | Dec. 31, 2022 USD ($) Investments | Dec. 31, 2021 USD ($) Investments
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Available for Sale |  |
Number of investments | Investments | 179 | 21
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 818,115 | $ 304,779
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 29,153 | 1,791
Available-for-sale Securities, 12 Months or Longer, Fair Value | 698,341 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 64,771 |
Available-for-sale Securities, Fair Value, Total | 1,516,456 | 304,779
Available-for-sale Securities, Unrealized Losses, Total | $ 93,924 | $ 1,791
U.S. Treasuries [Member] |  |
Available for Sale |  |
Number of investments | Investments | 74 | 10
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 787,925 | $ 298,080
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 27,078 | 1,766
Available-for-sale Securities, 12 Months or Longer, Fair Value | 689,939 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 63,621 |
Available-for-sale Securities, Fair Value, Total | 1,477,864 | 298,080
Available-for-sale Securities, Unrealized Losses, Total | $ 90,699 | $ 1,766
U.S. Federal Agencies [Member] |  |
Available for Sale |  |
Number of investments | Investments | 1 | 1
Available-for-sale Securities, Less than 12 Months, Fair Value |  | $ 376
Available-for-sale Securities, Less than 12 Months, Unrealized Losses |  | 2
Available-for-sale Securities, 12 Months or Longer, Fair Value | $ 349 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 1 |
Available-for-sale Securities, Fair Value, Total | 349 | 376
Available-for-sale Securities, Unrealized Losses, Total | $ 1 | $ 2
Mortgage Backed Securities [Member] |  |
Available for Sale |  |
Number of investments | Investments | 92 | 7
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 10,001 | $ 2,824
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 1,239 | 14
Available-for-sale Securities, 12 Months or Longer, Fair Value | 5,055 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 645 |
Available-for-sale Securities, Fair Value, Total | 15,056 | 2,824
Available-for-sale Securities, Unrealized Losses, Total | $ 1,884 | $ 14
States and Political Subdivisions [Member] |  |
Available for Sale |  |
Number of investments | Investments | 8 | 2
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 2,308 | $ 505
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 184 | 3
Available-for-sale Securities, 12 Months or Longer, Fair Value | 464 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 37 |
Available-for-sale Securities, Fair Value, Total | 2,772 | 505
Available-for-sale Securities, Unrealized Losses, Total | $ 221 | $ 3
Asset backed Securities [Member] |  |
Available for Sale |  |
Number of investments | Investments | 1 |
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 13,010 |
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 361 |
Available-for-sale Securities, Fair Value, Total | 13,010 |
Available-for-sale Securities, Unrealized Losses, Total | $ 361 |
Other Securities [Member] |  |
Available for Sale |  |
Number of investments | Investments | 3 | 1
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 4,871 | $ 2,994
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 291 | 6
Available-for-sale Securities, 12 Months or Longer, Fair Value | 2,534 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 467 |
Available-for-sale Securities, Fair Value, Total | 7,405 | 2,994
Available-for-sale Securities, Unrealized Losses, Total | $ 758 | $ 6

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