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Restrictions On Cash (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	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