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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total securities available for sale	$ 434,524	$ 336,316
Gross Unrealized Gains	23,792	27,183
Gross Unrealized Losses	(512)	(35)
Fair Value	457,804	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	56,359	21,479
Gross Unrealized Gains	195	220
Gross Unrealized Losses	(151)	(6)
Fair Value	56,403	21,693
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total securities available for sale	218,812	208,013
Gross Unrealized Gains	19,222	21,000
Gross Unrealized Losses	(65)	(1)
Fair Value	237,969	229,012
Mortgage-backed Securities in Government Sponsored Entities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total securities available for sale	159,353	106,824
Gross Unrealized Gains	4,375	5,963
Gross Unrealized Losses	(296)	(28)
Fair Value	$ 163,432	$ 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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