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Concentration Of Credit Risk (Narrative) (Details)	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)
Accounts secured by FDIC	1
FDIC coverage amount | $	$ 250,000
Uninsured cash balances | $	$ 6,700,000	$ 3,100,000
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

X

- Definition

Accounts Secured By The Federal Deposit Insurance Corporation

+ References

No definition available.

+ Details

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Namespace Prefix:	botj_
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X

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

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Data Type:	xbrli:monetaryItemType
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Period Type: