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Restrictions On Cash (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Restrictions On Cash [Abstract] |  |
Daily average cash reserve | $ 6,733 | $ 5,562

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- Definition Daily Average Cash Reserve Requirements + References No definition available. + Details
Name: | botj_DailyAverageCashReserveRequirements
Namespace Prefix: | botj_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CashAndCashEquivalentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration