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Securities - Summary of Amortized Cost and Estimated Fair Values of Debt Securities Available for Sale (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 773,574	$ 464,298
Gross Unrealized Gains	1,499	840
Gross Unrealized Losses	(4,369)	(3,139)
Estimated Fair Value	770,704	461,999
U.S. Treasuries [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	699,882	314,905
Gross Unrealized Gains	1,108
Gross Unrealized Losses	(3,524)	(2,103)
Estimated Fair Value	697,466	312,802
U.S. Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	30,079	89,098
Gross Unrealized Gains		82
Gross Unrealized Losses	(160)	(329)
Estimated Fair Value	29,919	88,851
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	16,367	18,358
Gross Unrealized Gains	114	204
Gross Unrealized Losses	(573)	(586)
Estimated Fair Value	15,908	17,976
States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	27,246	41,937
Gross Unrealized Gains	277	554
Gross Unrealized Losses	(112)	(121)
Estimated Fair Value	$ 27,411	$ 42,370

X

- Definition

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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Amount of 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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