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Fair Value Measurements (Information Regarding Quantitative Inputs Used To Value Assets Classified As Level 3) (Details) (Significant Unobservable Inputs (Level 3) [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value	3,128us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = botj_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Impaired Loans [Member] | Maximum [Member] | Discounted Appraised Value [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Selling cost	10.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = botj_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = botj_DiscountedAppraisedValueMember
Discount for lack of marketability and age of appraisal	25.00%us-gaap_FairValueInputsDiscountForLackOfMarketability / us-gaap_FairValueByAssetClassAxis = botj_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = botj_DiscountedAppraisedValueMember
Impaired Loans [Member] | Minimum [Member] | Discounted Appraised Value [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Selling cost	5.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = botj_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = botj_DiscountedAppraisedValueMember
Discount for lack of marketability and age of appraisal	0.00%us-gaap_FairValueInputsDiscountForLackOfMarketability / us-gaap_FairValueByAssetClassAxis = botj_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = botj_DiscountedAppraisedValueMember
Impaired Loans [Member] | Weighted Average [Member] | Discounted Appraised Value [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Selling cost	6.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = botj_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = botj_DiscountedAppraisedValueMember
Discount for lack of marketability and age of appraisal	15.00%us-gaap_FairValueInputsDiscountForLackOfMarketability / us-gaap_FairValueByAssetClassAxis = botj_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = botj_DiscountedAppraisedValueMember
OREO [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value	2,081us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = botj_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
OREO [Member] | Maximum [Member] | Discounted Appraised Value [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Selling cost	10.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = botj_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = botj_DiscountedAppraisedValueMember
Discount for lack of marketability and age of appraisal	25.00%us-gaap_FairValueInputsDiscountForLackOfMarketability / us-gaap_FairValueByAssetClassAxis = botj_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = botj_DiscountedAppraisedValueMember
OREO [Member] | Minimum [Member] | Discounted Appraised Value [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Selling cost	5.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = botj_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = botj_DiscountedAppraisedValueMember
Discount for lack of marketability and age of appraisal	0.00%us-gaap_FairValueInputsDiscountForLackOfMarketability / us-gaap_FairValueByAssetClassAxis = botj_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = botj_DiscountedAppraisedValueMember
OREO [Member] | Weighted Average [Member] | Discounted Appraised Value [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Selling cost	6.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = botj_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = botj_DiscountedAppraisedValueMember
Discount for lack of marketability and age of appraisal	15.00%us-gaap_FairValueInputsDiscountForLackOfMarketability / us-gaap_FairValueByAssetClassAxis = botj_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = botj_DiscountedAppraisedValueMember

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

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Balance Type:	debit
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X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Adjustment to the discount rate used to measure fair value for lack of ability to convert business interests into cash quickly.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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X

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

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Period Type:	duration

X

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X

- Details

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