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Organization (Details)	12 Months Ended
	Dec. 31, 2017 item
Number of wholly-owned non-operating subsidiaries	1
Number of bank locations	5
Lynchburg Virginia [Member]
Limited service bank branch	1
Forest Virginia [Member]
Number of bank locations	1
Madison Heights [Member]
Number of bank locations	1
Amherst Virginia [Member]
Number of bank locations	1
Bedford Virginia [Member]
Number of bank locations	1
Altavista Virginia [Member]
Number of bank locations	1
Appomattox Virginia [Member]
Number of bank locations	1
Charlottesville Virginia [Member]
Number of bank locations	1
Limited service bank branch	2

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Limited Service Bank Banches

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Number Of Wholly-Owned Non-Operating Subsidiaries

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