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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
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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