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Securities - Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) $ in Thousands | Mar. 31, 2023 USD ($) Investments | Dec. 31, 2022 USD ($) Investments
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Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 179 | 179
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 508,311 | $ 818,115
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 10,072 | 29,153
Available-for-sale Securities, 12 Months or Longer, Fair Value | 989,448 | 698,341
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 66,028 | 64,771
Available-for-sale Securities, Fair Value, Total | 1,497,759 | 1,516,456
Available-for-sale Securities, Unrealized Losses, Total | $ 76,100 | $ 93,924
U.S. Treasuries [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 71 | 74
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 501,386 | $ 787,925
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 9,684 | 27,078
Available-for-sale Securities, 12 Months or Longer, Fair Value | 958,843 | 689,939
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 63,308 | 63,621
Available-for-sale Securities, Fair Value, Total | 1,460,229 | 1,477,864
Available-for-sale Securities, Unrealized Losses, Total | $ 72,992 | $ 90,699
U.S. Federal Agencies [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 1 | 1
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 344 |
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 1 |
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 | 344 | 349
Available-for-sale Securities, Unrealized Losses, Total | $ 1 | $ 1
Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 95 | 92
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 302 | $ 10,001
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 3 | 1,239
Available-for-sale Securities, 12 Months or Longer, Fair Value | 14,364 | 5,055
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 1,770 | 645
Available-for-sale Securities, Fair Value, Total | 14,666 | 15,056
Available-for-sale Securities, Unrealized Losses, Total | $ 1,773 | $ 1,884
States and Political Subdivisions [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 8 | 8
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 1,486 | $ 2,308
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 14 | 184
Available-for-sale Securities, 12 Months or Longer, Fair Value | 1,311 | 464
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 100 | 37
Available-for-sale Securities, Fair Value, Total | 2,797 | 2,772
Available-for-sale Securities, Unrealized Losses, Total | $ 114 | $ 221
Asset backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 1 | 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, 12 Months or Longer, Fair Value | $ 12,363 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 417 |
Available-for-sale Securities, Fair Value, Total | 12,363 | 13,010
Available-for-sale Securities, Unrealized Losses, Total | $ 417 | $ 361
Other Securities [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 3 | 3
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 4,793 | $ 4,871
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 370 | 291
Available-for-sale Securities, 12 Months or Longer, Fair Value | 2,567 | 2,534
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 433 | 467
Available-for-sale Securities, Fair Value, Total | 7,360 | 7,405
Available-for-sale Securities, Unrealized Losses, Total | $ 803 | $ 758

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