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Securities - Available for Sale Securities (Detail) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Total securities available for sale $ 336,316,000 $ 342,192,000
Gross Unrealized Gains 27,183,000 16,476,000
Gross Unrealized Losses (35,000) (169,000)
Fair Value 363,464,000 358,499,000
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 21,479,000 19,401,000
Gross Unrealized Gains 220,000 204,000
Gross Unrealized Losses (6,000) (4,000)
Fair Value 21,693,000 19,601,000
Obligations of States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Total securities available for sale 208,013,000 193,646,000
Gross Unrealized Gains 21,000,000 12,409,000
Gross Unrealized Losses (1,000) (21,000)
Fair Value 229,012,000 206,034,000
Mortgage-back Securities in Government Sponsored Entities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Total securities available for sale 106,824,000 129,145,000
Gross Unrealized Gains 5,963,000 3,863,000
Gross Unrealized Losses (28,000) (144,000)
Fair Value $ 112,759,000 $ 132,864,000