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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value $ 14,130,000 $ 12,600,000
12 Months or less, Unrealized Loss (34,000) (112,000)
More than 12 months, Fair Value 126,000 11,140,000
More than 12 months, Unrealized Loss (1,000) (57,000)
Total Fair Value 14,256,000 23,740,000
Total Unrealized Loss (35,000) (169,000)
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 6,501,000  
12 Months or less, Unrealized Loss (5,000)  
More than 12 months, Fair Value 126,000 3,408,000
More than 12 months, Unrealized Loss (1,000) (4,000)
Total Fair Value 6,627,000 3,408,000
Total Unrealized Loss (6,000) (4,000)
Obligations of States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 1,874,000 1,947,000
12 Months or less, Unrealized Loss (1,000) (21,000)
Total Fair Value 1,874,000 1,947,000
Total Unrealized Loss (1,000) (21,000)
Mortgage-backed Securities in Government Sponsored Entities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 5,755,000 10,653,000
12 Months or less, Unrealized Loss (28,000) (91,000)
More than 12 months, Fair Value   7,732,000
More than 12 months, Unrealized Loss   (53,000)
Total Fair Value 5,755,000 18,385,000
Total Unrealized Loss $ (28,000) $ (144,000)