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Fair Value Measurements (Impaired Loans And Other Real Estate Owned Measured At Fair Value On A Nonrecurring Basis) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Impaired loans | $ 3,128 botj_ImpairedLoansAtFairvalue | [1] | $ 3,045 botj_ImpairedLoansAtFairvalue | [1] |
Loans held for sale | 1,742 us-gaap_LoansReceivableHeldForSaleNet |  | 1,030 us-gaap_LoansReceivableHeldForSaleNet |  |
Other real estate owned | 2,081 us-gaap_RealEstateAcquiredThroughForeclosure |  | 956 us-gaap_RealEstateAcquiredThroughForeclosure |  | 1,451 us-gaap_RealEstateAcquiredThroughForeclosure
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Impaired loans |  | [1] |  | [1] |
Loans held for sale |  |  |  |  |
Other real estate owned |  |  |  |  |
Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Loans held for sale | 1,742 us-gaap_LoansReceivableHeldForSaleNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  | 1,030 us-gaap_LoansReceivableHeldForSaleNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Impaired loans | 3,128 botj_ImpairedLoansAtFairvalue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | [1] | 3,045 botj_ImpairedLoansAtFairvalue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | [1] |
Loans held for sale |  |  |  |  |
Other real estate owned | $ 2,081 us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | $ 956 us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
[1] | Includes loans charged down during the quarter to the net realizable value of the collateral.

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- Definition Impaired Loans At Fair Value + References No definition available. + Details
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- Definition Amount of loans held for sale, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 35 -Paragraph 49 -URI http://asc.fasb.org/extlink&oid=25442802&loc=d3e3084-111518 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6490209&loc=d3e48214-111002 + Details
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- Definition Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 + Details
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