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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
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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