Debt instrument amortization period

No definition available.

Name:	botj_DebtInstrumentAmortizationPeriod
Namespace Prefix:	botj_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of capital stock purchased

+ References

No definition available.

+ Details

Name:	botj_PercentageOfCapitalStockPurchased
Namespace Prefix:	botj_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of common stock secured by first priority lien.

+ References

No definition available.

+ Details

Name:	botj_PercentageOfCommonStockSecuredByFirstPriorityLien
Namespace Prefix:	botj_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Principal Notes Sold, Value

+ References

No definition available.

+ Details

Name:	botj_PrincipalNotesSoldValue
Namespace Prefix:	botj_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=botj_PettyjohnWoodWhiteIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=botj_NationalBankOfBlacksburgMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=botj_CapitalNotesFourPercentDueJanuaryTwentyFourTwoThousandTwentyTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=botj_CapitalNotesOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=botj_TwentyTwentyOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Capital Notes and Other Borrowings (Narrative) (Details) - USD ($)				9 Months Ended
	Jul. 01, 2022	Dec. 29, 2021	Sep. 24, 2020	Sep. 30, 2022	Dec. 31, 2026	Apr. 13, 2020
Pettyjohn, Wood & White, Inc [Member]
Debt Instrument [Line Items]
Percentage of capital stock purchased				100.00%
National Bank of Blacksburg (NBB Note) [Member]
Debt Instrument [Line Items]
Capital notes, interest rate	3.90%	4.00%		4.00%
Capital notes, maturity date	Dec. 31, 2026			Dec. 31, 2024
Proceeds from Issuance of Debt		$ 11,000,000
Debt instrument amortization period				15 years
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid		$ 9,375,000
Percentage of common stock secured by first priority lien				4.95%
National Bank of Blacksburg (NBB Note) [Member] \| Forecast [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid					$ 8,104,000
Capital Notes 4% Due 1/24/2022 [Member]
Debt Instrument [Line Items]
Capital notes, interest rate				4.00%
Proceeds used to pay off debt			$ 5,000,000
Capital Notes 3.25% Due 09/30/2025 [Member] \| 2020 Offering [Member]
Debt Instrument [Line Items]
Capital notes, interest rate				3.25%
Capital notes, maturity date				Jun. 30, 2025
Principal notes						$ 10,050,000