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Loans, Allowance For Loan Losses and OREO (Narrative) (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 contract | Mar. 31, 2014 contract | Dec. 31, 2014
Loans, Allowance For Loan Losses and OREO [Abstract] |  |  |
Amount of Loan Modification | $ 20,000 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 |  |
Number of loans classified as TDRs |  | 0 botj_TroubledDebtRestructuringModificationsNumberOfContracts |
Number of Contracts (That Subsequently Defaulted) | 0 botj_FinancingReceivablesDefaultsNumberOfDefaults | 0 botj_FinancingReceivablesDefaultsNumberOfDefaults |
Other real estate owned | $ 65,000 us-gaap_OtherRealEstate |  | $ 65,000 us-gaap_OtherRealEstate

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- Definition Financing receivables, defaults, number of defaults + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Troubled Debt Restructuring Modifications Number Of Contracts + References No definition available. + Details
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Namespace Prefix: | botj_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953682-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Definition Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_OtherRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant