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Securities - Summary of Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	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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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

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