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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 433,962	$ 300,602
Gross Unrealized Gains	3,032	7,350
Gross Unrealized Losses	(7,063)	(140)
Fair Value	429,931	307,812
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	90,775
Gross Unrealized Losses	(1,598)
Fair Value	89,177
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	159,673	122,514
Gross Unrealized Gains	695	1,857
Gross Unrealized Losses	(3,482)	(130)
Fair Value	156,886	124,241
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	118,550	110,828
Gross Unrealized Gains	839	2,228
Gross Unrealized Losses	(1,462)
Fair Value	117,927	113,056
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	64,964	67,260
Gross Unrealized Gains	1,498	3,265
Gross Unrealized Losses	(521)	(10)
Fair Value	$ 65,941	$ 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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