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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, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 485,082	$ 773,574
Gross Unrealized Gains	5,407	1,499
Gross Unrealized Losses	(766)	(4,369)
Estimated Fair Value	489,723	770,704
U.S. Treasuries [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	409,488	699,882
Gross Unrealized Gains	4,974	1,108
Gross Unrealized Losses	(13)	(3,524)
Estimated Fair Value	414,449	697,466
U.S. Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	23,039	30,079
Gross Unrealized Gains	23
Gross Unrealized Losses	(38)	(161)
Estimated Fair Value	23,024	29,918
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	16,941	2,352
Gross Unrealized Gains	128	114
Gross Unrealized Losses	(64)
Estimated Fair Value	17,005	2,466
States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	22,294	27,246
Gross Unrealized Gains	282	277
Gross Unrealized Losses	(45)	(112)
Estimated Fair Value	22,531	27,411
Asset backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,320	14,015
Gross Unrealized Losses	(606)	(572)
Estimated Fair Value	$ 12,714	$ 13,443

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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