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Earnings Per Common Share (EPS) (Narrative) (Details) |  | 3 Months Ended
--- | --- | ---
May 18, 2021 | Jun. 30, 2021
Earnings Per Common Share (EPS) [Abstract] |  |
Percentage of Stock Divided Issued | 10.00% | 10.00%

X
- Definition The percentage of stock divided issued during the period. + References No definition available. + Details
Name: | botj_PercentageOfStockDividedIssued
Namespace Prefix: | botj_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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