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Loans, Allowance For Loan Losses and OREO (Loans On Non-Accrual Status) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivables on Non-Accrual Status | $ 2,102 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus | $ 3,506 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivables on Non-Accrual Status | 679 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialLoanMember | 1,965 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialLoanMember
Commercial Mortgages-Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivables on Non-Accrual Status |  | 212 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = botj_CommercialMortgagesOwnerOccupiedMember
Commercial Mortgages-Non-Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivables on Non-Accrual Status | 137 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = botj_CommercialMortgagesNonOwnerOccupiedMember | 70 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = botj_CommercialMortgagesNonOwnerOccupiedMember
Commercial Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivables on Non-Accrual Status | 460 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember | 460 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Consumer Unsecured [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivables on Non-Accrual Status |  |
Consumer Secured [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivables on Non-Accrual Status | 19 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = botj_ConsumerSecuredMember | 20 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = botj_ConsumerSecuredMember
Residential Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivables on Non-Accrual Status | 718 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember | 689 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember
Residential Consumer Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivables on Non-Accrual Status | $ 89 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = botj_ResidentialConsumerConstructionMember | $ 90 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = botj_ResidentialConsumerConstructionMember

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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5111-111524 + Details
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