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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, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 553,662	$ 542,289
Gross Unrealized Gains	7,832	10,626
Gross Unrealized Losses	(711)	(683)
Estimated Fair Value	560,783	552,232
U.S. Treasuries [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	465,762	465,416
Gross Unrealized Gains	6,680	9,820
Gross Unrealized Losses	(600)
Estimated Fair Value	471,842	475,236
U.S. Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	25,273	19,697
Gross Unrealized Gains	324	1
Gross Unrealized Losses	(2)	(60)
Estimated Fair Value	25,595	19,638
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	38,407	15,268
Gross Unrealized Gains	471	428
Gross Unrealized Losses	(109)
Estimated Fair Value	38,769	15,696
States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,874	28,571
Gross Unrealized Gains	227	377
Estimated Fair Value	11,101	28,948
Asset backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,346	13,337
Gross Unrealized Gains	130
Gross Unrealized Losses		(623)
Estimated Fair Value	$ 13,476	$ 12,714

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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