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Other Real Estate Owned (Schedule Of OREO Expenses) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Other Real Estate Owned [Abstract] |  |
(Gain) loss on sales | $ 1 | $ (1)
Write-downs | 60 | 45
Expenses | 27 | 24
Total | $ 88 | $ 68

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- Definition Other Expenses For Other Real Estate Owned + References No definition available. + Details
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Namespace Prefix: | botj_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Writedown On Other Real Estate Owned + References No definition available. + Details
Name: | botj_WritedownOnOtherRealEstateOwned
Namespace Prefix: | botj_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of expense recognized during the period for the foreclosure on real estate assets. + References No definition available. + Details
Name: | us-gaap_ForeclosedRealEstateExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_GainsLossesOnSalesOfOtherRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration