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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total securities available for sale	$ 683,374	$ 541,297
Gross Unrealized Gains	202	20,664
Gross Unrealized Losses	(81,530)	(2,087)
Fair Value	602,046	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	66,199	48,390
Gross Unrealized Gains	22	30
Gross Unrealized Losses	(5,677)	(530)
Fair Value	60,544	47,890
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total securities available for sale	344,225	281,247
Gross Unrealized Gains	163	17,696
Gross Unrealized Losses	(46,581)	(107)
Fair Value	297,807	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	272,950	211,660
Gross Unrealized Gains	17	2,938
Gross Unrealized Losses	(29,272)	(1,450)
Fair Value	$ 243,695	$ 213,148

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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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