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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 425,578	$ 300,602
Gross Unrealized Gains	4,546	7,350
Gross Unrealized Losses	(3,407)	(140)
Fair Value	426,717	307,812
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	74,347
Gross Unrealized Gains	29
Gross Unrealized Losses	(572)
Fair Value	73,804
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	163,771	122,514
Gross Unrealized Gains	1,123	1,857
Gross Unrealized Losses	(1,698)	(130)
Fair Value	163,196	124,241
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	124,658	110,828
Gross Unrealized Gains	1,348	2,228
Gross Unrealized Losses	(907)
Fair Value	125,099	113,056
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	62,802	67,260
Gross Unrealized Gains	2,046	3,265
Gross Unrealized Losses	(230)	(10)
Fair Value	$ 64,618	$ 70,515

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- 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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