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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
12 Months Ended
Dec. 31, 2014
Impaired Loans [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Assets, Fair Value 3,045us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= botj_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Impaired Loans [Member] | Maximum [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
Discount for lack of marketability and age of appraisal 45.00%us-gaap_FairValueInputsDiscountForLackOfMarketability
/ us-gaap_FairValueByAssetClassAxis
= botj_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Impaired Loans [Member] | Minimum [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
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
Impaired Loans [Member] | Weighted Average [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
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
OREO [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Assets, Fair Value 956us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= botj_OtherRealEstateOwnedMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
OREO [Member] | Maximum [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
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
OREO [Member] | Minimum [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
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
OREO [Member] | Weighted Average [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
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