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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total securities available for sale	$ 571,247	$ 541,297
Gross Unrealized Gains	6,382	20,664
Gross Unrealized Losses	(25,252)	(2,087)
Fair Value	552,377	559,874
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	46,291	48,390
Gross Unrealized Gains	23	30
Gross Unrealized Losses	(2,662)	(530)
Fair Value	43,652	47,890
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total securities available for sale	311,494	281,247
Gross Unrealized Gains	5,736	17,696
Gross Unrealized Losses	(11,246)	(107)
Fair Value	305,984	298,836
Mortgage-backed Securities in Government Sponsored Entities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total securities available for sale	213,462	211,660
Gross Unrealized Gains	623	2,938
Gross Unrealized Losses	(11,344)	(1,450)
Fair Value	$ 202,741	$ 213,148

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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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