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v3.21.1

Concentration Of Credit Risk (Narrative) (Details) | Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($)
--- | --- | ---
Accounts secured by FDIC | 1 |
FDIC coverage amount | $ | $ 250,000 |
Uninsured cash balances | $ | $ 5,544,000 | $ 6,300,000
Community Bankers Bank [Member] |  |
Accounts secured by FDIC | 1 |
Suntrust Bank [Member] |  |
Accounts secured by FDIC | 1 |
Zions Bank [Member] |  |
Accounts secured by FDIC | 1 |

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- Definition Accounts Secured By The Federal Deposit Insurance Corporation + References No definition available. + Details
Name: | botj_AccountsSecuredByFederalDepositInsuranceCorporation
Namespace Prefix: | botj_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
Name: | us-gaap_CashFDICInsuredAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
Name: | us-gaap_CashUninsuredAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentAxis=botj_CommunityBankersBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=botj_SuntrustBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=botj_ZionsBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |