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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total securities available for sale	$ 345,836	$ 342,192
Gross Unrealized Gains	20,169	16,476
Gross Unrealized Losses	(119)	(169)
Fair Value	365,886	358,499
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	19,184	19,401
Gross Unrealized Gains	428	204
Gross Unrealized Losses	(1)	(4)
Fair Value	19,611	19,601
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total securities available for sale	198,309	193,646
Gross Unrealized Gains	13,923	12,409
Gross Unrealized Losses	(83)	(21)
Fair Value	212,149	206,034
Mortgage-backed Securities in Government Sponsored Entities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Total securities available for sale	128,343	129,145
Gross Unrealized Gains	5,818	3,863
Gross Unrealized Losses	(35)	(144)
Fair Value	$ 134,126	$ 132,864

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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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