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Securities - Summary of Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 309,602 | $ 190,508
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 2,669 | 1,339
Available-for-sale Securities, 12 Months or Longer, Fair Value | 103,780 | 25,821
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 1,364 | 832
Available-for-sale Securities, Fair Value, Total | 413,382 | 216,329
Available-for-sale Securities, Unrealized Losses, Total | 4,033 | 2,171
Held for Investment |  |
Held-to-maturity Securities, Less than 12 Months, Fair Value | 65 | 483
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses |  | 4
Held-to-maturity Securities, 12 Months or Longer, Fair Value | 485 | 9
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses | 2 |
Held-to-maturity Securities, Fair Value, Total | 550 | 492
Held-to-maturity Securities, Unrealized Losses, Total | 2 | 4
U.S. Treasuries [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 283,302 | 103,705
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 1,653 | 920
Available-for-sale Securities, 12 Months or Longer, Fair Value | 29,500 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 450 |
Available-for-sale Securities, Fair Value, Total | 312,802 | 103,705
Available-for-sale Securities, Unrealized Losses, Total | 2,103 | 920
U.S. Federal Agencies [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 3,499 | 71,511
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 8 | 357
Available-for-sale Securities, 12 Months or Longer, Fair Value | 59,220 | 9,619
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 321 | 48
Available-for-sale Securities, Fair Value, Total | 62,719 | 81,130
Available-for-sale Securities, Unrealized Losses, Total | 329 | 405
Mortgage Backed Securities [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 1 | 3
Available-for-sale Securities, 12 Months or Longer, Fair Value | 14,475 | 14,834
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 586 | 567
Available-for-sale Securities, Fair Value, Total | 14,476 | 14,837
Available-for-sale Securities, Unrealized Losses, Total | 586 | 567
Held for Investment |  |
Held-to-maturity Securities, Less than 12 Months, Fair Value |  | 7
Held-to-maturity Securities, 12 Months or Longer, Fair Value | 7 | 9
Held-to-maturity Securities, Fair Value, Total | 7 | 16
States and Political Subdivisions [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 21,300 | 15,289
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 114 | 62
Available-for-sale Securities, 12 Months or Longer, Fair Value | 585 | 779
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 7 | 67
Available-for-sale Securities, Fair Value, Total | 21,885 | 16,068
Available-for-sale Securities, Unrealized Losses, Total | 121 | 129
Held for Investment |  |
Held-to-maturity Securities, Less than 12 Months, Fair Value | 65 | 476
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses |  | 4
Held-to-maturity Securities, 12 Months or Longer, Fair Value | 478 |
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses | 2 |
Held-to-maturity Securities, Fair Value, Total | 543 | 476
Held-to-maturity Securities, Unrealized Losses, Total | 2 | 4
Other Securities [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 1,500 |
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 894 |
Available-for-sale Securities, 12 Months or Longer, Fair Value |  | 589
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses |  | 150
Available-for-sale Securities, Fair Value, Total | 1,500 | 589
Available-for-sale Securities, Unrealized Losses, Total | $ 894 | $ 150

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