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Business Segments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 segment | Mar. 31, 2014 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments | 2 us-gaap_NumberOfReportableSegments |  |
Net interest income | $ 4,196 us-gaap_InterestIncomeExpenseNet | $ 3,954 us-gaap_InterestIncomeExpenseNet |
Provision for loan losses | 100 us-gaap_ProvisionForLoanLeaseAndOtherLosses | 55 us-gaap_ProvisionForLoanLeaseAndOtherLosses | 55 us-gaap_ProvisionForLoanLeaseAndOtherLosses
Net interest income after provision for loan losses | 4,096 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 3,899 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss |
Noninterest income | 947 us-gaap_NoninterestIncome | 717 us-gaap_NoninterestIncome |
Noninterest expenses | 3,680 us-gaap_NoninterestExpense | 3,609 us-gaap_NoninterestExpense |
Income before income taxes | 1,363 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 1,007 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
Income tax expense | 436 us-gaap_IncomeTaxExpenseBenefit | 302 us-gaap_IncomeTaxExpenseBenefit |
Net Income | 927 us-gaap_NetIncomeLoss | 705 us-gaap_NetIncomeLoss |
Total assets | 488,007 us-gaap_Assets | 442,584 us-gaap_Assets | 460,865 us-gaap_Assets
Community Banking [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 4,196 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = botj_CommunityBankingMember | 3,954 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = botj_CommunityBankingMember |
Provision for loan losses | 100 us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_StatementBusinessSegmentsAxis = botj_CommunityBankingMember | 55 us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_StatementBusinessSegmentsAxis = botj_CommunityBankingMember |
Net interest income after provision for loan losses | 4,096 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss / us-gaap_StatementBusinessSegmentsAxis = botj_CommunityBankingMember | 3,899 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss / us-gaap_StatementBusinessSegmentsAxis = botj_CommunityBankingMember |
Noninterest income | 413 us-gaap_NoninterestIncome / us-gaap_StatementBusinessSegmentsAxis = botj_CommunityBankingMember | 428 us-gaap_NoninterestIncome / us-gaap_StatementBusinessSegmentsAxis = botj_CommunityBankingMember |
Noninterest expenses | 3,293 us-gaap_NoninterestExpense / us-gaap_StatementBusinessSegmentsAxis = botj_CommunityBankingMember | 3,350 us-gaap_NoninterestExpense / us-gaap_StatementBusinessSegmentsAxis = botj_CommunityBankingMember |
Income before income taxes | 1,216 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = botj_CommunityBankingMember | 977 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = botj_CommunityBankingMember |
Income tax expense | 386 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = botj_CommunityBankingMember | 292 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = botj_CommunityBankingMember |
Net Income | 830 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = botj_CommunityBankingMember | 685 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = botj_CommunityBankingMember |
Total assets | 486,184 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = botj_CommunityBankingMember | 440,610 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = botj_CommunityBankingMember |
Mortgage [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Noninterest income | 534 us-gaap_NoninterestIncome / us-gaap_StatementBusinessSegmentsAxis = botj_MortgageMember | 289 us-gaap_NoninterestIncome / us-gaap_StatementBusinessSegmentsAxis = botj_MortgageMember |
Noninterest expenses | 387 us-gaap_NoninterestExpense / us-gaap_StatementBusinessSegmentsAxis = botj_MortgageMember | 259 us-gaap_NoninterestExpense / us-gaap_StatementBusinessSegmentsAxis = botj_MortgageMember |
Income before income taxes | 147 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = botj_MortgageMember | 30 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = botj_MortgageMember |
Income tax expense | 50 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = botj_MortgageMember | 10 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = botj_MortgageMember |
Net Income | 97 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = botj_MortgageMember | 20 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = botj_MortgageMember |
Total assets | $ 1,823 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = botj_MortgageMember | $ 1,974 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = botj_MortgageMember |

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