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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total securities available for sale	$ 541,297	$ 336,316
Gross Unrealized Gains	20,664	27,183
Gross Unrealized Losses	(2,087)	(35)
Fair Value	559,874	363,464
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total securities available for sale	48,390	21,479
Gross Unrealized Gains	30	220
Gross Unrealized Losses	(530)	(6)
Fair Value	47,890	21,693
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total securities available for sale	281,247	208,013
Gross Unrealized Gains	17,696	21,000
Gross Unrealized Losses	(107)	(1)
Fair Value	298,836	229,012
Mortgage-back Securities in Government Sponsored Entities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total securities available for sale	211,660	106,824
Gross Unrealized Gains	2,938	5,963
Gross Unrealized Losses	(1,450)	(28)
Fair Value	$ 213,148	$ 112,759

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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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