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Capital Requirements - Summary of Capital Amounts and Ratios (Details) - The Fauquier Bank [Member] - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Total Capital (to Risk-Weighted Assets) [Abstract]    
Actual amount $ 69,295 $ 64,354
Actual ratio 12.80% 12.40%
Minimum capital requirement amount $ 43,134 $ 41,485
Minimum capital requirement ratio 8.00% 8.00%
Well capitalized under prompt corrective action provisions amount $ 53,918 $ 51,856
Well capitalized under prompt corrective action provisions ratio 10.00% 10.00%
Common Equity Tier One Capital [Abstract]    
Actual amount $ 64,119 $ 59,260
Actual ratio 11.90% 11.40%
Minimum capital requirement amount $ 24,263 $ 23,335
Minimum capital requirement ratio 4.50% 4.50%
Well capitalized under prompt corrective action provisions amount $ 35,047 $ 33,707
Well capitalized under prompt corrective action provisions ratio 6.50% 6.50%
Tier One Risk Based Capital [Abstract]    
Actual amount $ 64,119 $ 59,260
Actual ratio 11.90% 11.40%
Minimum capital requirement amount $ 32,351 $ 31,114
Minimum capital requirement ratio 6.00% 6.00%
Well capitalized under prompt corrective action provisions amount $ 43,134 $ 41,485
Well capitalized under prompt corrective action provisions ratio 8.00% 8.00%
Tier One Leverage Capital [Abstract]    
Actual amount $ 64,119 $ 59,260
Actual ratio 9.40% 9.20%
Minimum capital requirement amount $ 27,317 $ 25,862
Minimum capital requirement ratio 4.00% 4.00%
Well capitalized under prompt corrective action provisions amount $ 34,147 $ 32,328
Well capitalized under prompt corrective action provisions ratio 5.00% 5.00%