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Securities - Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 299,737 | $ 308,102
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 100 | 1,775
Available-for-sale Securities, 12 Months or Longer, Fair Value | 313,645 | 103,780
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 4,269 | 1,364
Available-for-sale Securities, Fair Value, Total | 613,382 | 411,882
Available-for-sale Securities, Unrealized Losses, Total | 4,369 | 3,139
Held for Investment |  |
Held-to-maturity Securities, Less than 12 Months, Fair Value |  | 65
Held-to-maturity Securities, 12 Months or Longer, Fair Value | 4 | 485
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses |  | 2
Held-to-maturity Securities, Fair Value, Total | 4 | 550
Held-to-maturity Securities, Unrealized Losses, Total |  | 2
U.S. Treasuries [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 296,438 | 283,302
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 90 | 1,653
Available-for-sale Securities, 12 Months or Longer, Fair Value | 261,639 | 29,500
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 3,434 | 450
Available-for-sale Securities, Fair Value, Total | 558,077 | 312,802
Available-for-sale Securities, Unrealized Losses, Total | 3,524 | 2,103
U.S. Federal Agencies [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 1,705 | 3,499
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 7 | 8
Available-for-sale Securities, 12 Months or Longer, Fair Value | 27,035 | 59,220
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 153 | 321
Available-for-sale Securities, Fair Value, Total | 28,740 | 62,719
Available-for-sale Securities, Unrealized Losses, Total | 160 | 329
Mortgage Backed Securities [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 1 | 1
Available-for-sale Securities, 12 Months or Longer, Fair Value | 13,444 | 14,475
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 573 | 586
Available-for-sale Securities, Fair Value, Total | 13,445 | 14,476
Available-for-sale Securities, Unrealized Losses, Total | 573 | 586
Held for Investment |  |
Held-to-maturity Securities, 12 Months or Longer, Fair Value | 4 | 7
Held-to-maturity Securities, Fair Value, Total | 4 | 7
States and Political Subdivisions [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 1,593 | 21,300
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 3 | 114
Available-for-sale Securities, 12 Months or Longer, Fair Value | 11,527 | 585
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 109 | 7
Available-for-sale Securities, Fair Value, Total | 13,120 | 21,885
Available-for-sale Securities, Unrealized Losses, Total | $ 112 | 121
Held for Investment |  |
Held-to-maturity Securities, Less than 12 Months, Fair Value |  | 65
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
Held-to-maturity Securities, Unrealized Losses, Total |  | $ 2

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