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Securities - Summary of Amortized Cost and Estimated Fair Values of Debt Securities Available for Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 592,008	$ 485,082
Gross Unrealized Gains	13,657	5,407
Gross Unrealized Losses	(689)	(766)
Estimated Fair Value	604,976	489,723
U.S. Treasuries [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	500,161	409,488
Gross Unrealized Gains	12,700	4,974
Gross Unrealized Losses		(13)
Estimated Fair Value	512,861	414,449
U.S. Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,242	23,039
Gross Unrealized Gains	5	23
Gross Unrealized Losses	(66)	(38)
Estimated Fair Value	21,181	23,024
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	16,127	16,941
Gross Unrealized Gains	455	128
Gross Unrealized Losses		(64)
Estimated Fair Value	16,582	17,005
States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	41,150	22,294
Gross Unrealized Gains	497	282
Gross Unrealized Losses	(9)	(45)
Estimated Fair Value	41,638	22,531
Asset backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,328	13,320
Gross Unrealized Losses	(614)	(606)
Estimated Fair Value	$ 12,714	$ 12,714

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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