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Capital Requirements - Summary of Capital Amounts and Ratios (Details) - The Fauquier Bank [Member]
$ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Total Capital (to Risk-Weighted Assets) [Abstract]    
Actual amount $ 79,784 $ 74,090
Actual ratio 13.9 13.5
Minimum capital requirement amount $ 46,024 $ 43,776
Minimum capital requirement ratio 8.0 8.0
Well capitalized under prompt corrective action provisions amount $ 57,530 $ 54,720
Well capitalized under prompt corrective action provisions ratio 10.0 10.0
Common Equity Tier One Capital [Abstract]    
Actual amount $ 72,914 $ 68,863
Actual ratio 12.7 12.6
Minimum capital requirement amount $ 25,889 $ 24,624
Minimum capital requirement ratio 4.50% 4.50%
Well capitalized under prompt corrective action provisions amount $ 37,395 $ 35,568
Well capitalized under prompt corrective action provisions ratio 6.50% 6.50%
Tier One Risk Based Capital [Abstract]    
Actual amount $ 72,914 $ 68,863
Actual ratio 12.7 12.6
Minimum capital requirement amount $ 34,518 $ 32,832
Minimum capital requirement ratio 6.0 6.0
Well capitalized under prompt corrective action provisions amount $ 46,024 $ 43,776
Well capitalized under prompt corrective action provisions ratio 8.0 8.0
Tier One Leverage Capital [Abstract]    
Actual amount $ 72,914 $ 68,863
Actual ratio 8.5 9.4
Minimum capital requirement amount $ 34,163 $ 29,298
Minimum capital requirement ratio 4.0 4.0
Well capitalized under prompt corrective action provisions amount $ 42,704 $ 36,622
Well capitalized under prompt corrective action provisions ratio 5.0 5.0