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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total securities available for sale	$ 681,378	$ 682,351
Gross Unrealized Gains	951	819
Gross Unrealized Losses	(65,031)	(67,768)
Fair Value	617,298	615,402
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	66,357	66,495
Gross Unrealized Gains	18	20
Gross Unrealized Losses	(5,231)	(5,486)
Fair Value	61,144	61,029
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total securities available for sale	358,564	350,104
Gross Unrealized Gains	922	784
Gross Unrealized Losses	(29,331)	(33,640)
Fair Value	330,155	317,248
Mortgage-backed Securities in Government Sponsored Entities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total securities available for sale	256,457	265,752
Gross Unrealized Gains	11	15
Gross Unrealized Losses	(30,469)	(28,642)
Fair Value	$ 225,999	$ 237,125

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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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