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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total securities available for sale	$ 582,156	$ 541,297
Gross Unrealized Gains	1,491	20,664
Gross Unrealized Losses	(52,830)	(2,087)
Fair Value	530,817	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	46,142	48,390
Gross Unrealized Gains	24	30
Gross Unrealized Losses	(3,842)	(530)
Fair Value	42,324	47,890
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total securities available for sale	327,023	281,247
Gross Unrealized Gains	1,348	17,696
Gross Unrealized Losses	(27,672)	(107)
Fair Value	300,699	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	208,991	211,660
Gross Unrealized Gains	119	2,938
Gross Unrealized Losses	(21,316)	(1,450)
Fair Value	$ 187,794	$ 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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