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Securities - Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 38,416 | $ 299,737
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 138 | 100
Available-for-sale Securities, 12 Months or Longer, Fair Value | 35,402 | 313,645
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 628 | 4,269
Available-for-sale Securities, Fair Value, Total | 73,818 | 613,382
Available-for-sale Securities, Unrealized Losses, Total | 766 | 4,369
Held for Investment |  |
Held-to-maturity Securities, Less than 12 Months, Fair Value | 1,016 |
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses | 5 |
Held-to-maturity Securities, 12 Months or Longer, Fair Value | 3 | 4
Held-to-maturity Securities, Fair Value, Total | 1,019 | 4
Held-to-maturity Securities, Unrealized Losses, Total | 5 |
U.S. Treasuries [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 8,999 | 296,438
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 10 | 90
Available-for-sale Securities, 12 Months or Longer, Fair Value | 19,988 | 261,639
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 3 | 3,434
Available-for-sale Securities, Fair Value, Total | 28,987 | 558,077
Available-for-sale Securities, Unrealized Losses, Total | 13 | 3,524
U.S. Federal Agencies [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 10,362 | 1,705
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 19 | 7
Available-for-sale Securities, 12 Months or Longer, Fair Value | 2,700 | 27,035
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 19 | 154
Available-for-sale Securities, Fair Value, Total | 13,062 | 28,740
Available-for-sale Securities, Unrealized Losses, Total | 38 | 161
Mortgage Backed Securities [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 15,165 | 1
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 64 |
Available-for-sale Securities, 12 Months or Longer, Fair Value |  | 1
Available-for-sale Securities, Fair Value, Total | 15,165 | 2
Available-for-sale Securities, Unrealized Losses, Total | 64 |
Held for Investment |  |
Held-to-maturity Securities, 12 Months or Longer, Fair Value | 3 | 4
Held-to-maturity Securities, Fair Value, Total | 3 | 4
States and Political Subdivisions [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 3,890 | 1,593
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 45 | 3
Available-for-sale Securities, 12 Months or Longer, Fair Value |  | 11,527
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses |  | 109
Available-for-sale Securities, Fair Value, Total | 3,890 | 13,120
Available-for-sale Securities, Unrealized Losses, Total | 45 | 112
Held for Investment |  |
Held-to-maturity Securities, Less than 12 Months, Fair Value | 1,016 |
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses | 5 |
Held-to-maturity Securities, Fair Value, Total | 1,016 |
Held-to-maturity Securities, Unrealized Losses, Total | 5 |
Asset backed Securities [Member] |  |
Available for Sale |  |
Available-for-sale Securities, 12 Months or Longer, Fair Value | 12,714 | 13,443
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 606 | 572
Available-for-sale Securities, Fair Value, Total | 12,714 | 13,443
Available-for-sale Securities, Unrealized Losses, Total | $ 606 | $ 572

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