Debt Conversion, Converted Instrument, Interest Expense Savings

No definition available.

Name:	mvbf_DebtConversionConvertedInstrumentInterestExpenseSavings
Namespace Prefix:	mvbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument after the fifth anniversary of the issuance.

+ References

No definition available.

+ Details

Name:	mvbf_DebtInstrumentBasisSpreadOnVariableRateAfterFifthAnniversary
Namespace Prefix:	mvbf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The period of notice that the issuer must provide the holders of its intent to prepay.

+ References

No definition available.

+ Details

Name:	mvbf_DebtInstrumentConvertibleNoticePeriodOfIntentToPrepay
Namespace Prefix:	mvbf_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold period of specified consecutive trading days after the first, second, third, fourth, or fifth anniversaries of the issuance of the debt instrument or upon a notice to prepay by the issuer within which the debt instrument may be convertible into common stock at the election of the holder.

+ References

No definition available.

+ Details

Name:	mvbf_DebtInstrumentConvertibleThresholdConsecutiveTradingDaysAfterFirstSecondThirdFourthAndFifthAnniversariesOfIssuanceOrPrepaymentNotice
Namespace Prefix:	mvbf_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of each increment of debt instrument issued.

+ References

No definition available.

+ Details

Name:	mvbf_DebtInstrumentFaceAmountOfIncrementalIssue
Namespace Prefix:	mvbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of investment of debtholder.

+ References

No definition available.

+ Details

Name:	mvbf_DebtInstrumentInvestmentAmountOfHolder
Namespace Prefix:	mvbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The maximum contractual rate for funds borrowed under the debt agreement after the fifth anniversary of issuance.

+ References

No definition available.

+ Details

Name:	mvbf_DebtInstrumentMaximumInterestRateStatedPercentageAfterFifthAnniversary
Namespace Prefix:	mvbf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The minimum investment in the debt instrument required by investors under terms of the offering.

+ References

No definition available.

+ Details

Name:	mvbf_DebtInstrumentMinimumInvestmentRequired
Namespace Prefix:	mvbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The minimum ownership of common stock as a percentage of debt instrument principal acquired.

+ References

No definition available.

+ Details

Name:	mvbf_DebtInstrumentMinimumOwnershipOfCommonStockAsPercentageOfPrincipalAcquired
Namespace Prefix:	mvbf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The period from issuance at which the issuer of the debt instrument may make prepayments on the unpaid principal and interest amounts.

+ References

No definition available.

+ Details

Name:	mvbf_DebtInstrumentPeriodFromIssuanceThatIssuerMayPrepayDebt
Namespace Prefix:	mvbf_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The period from the date of issuance at which the debt instrument may be redeemed.

+ References

No definition available.

+ Details

Name:	mvbf_DebtInstrumentRedemptionPeriodFromIssuance
Namespace Prefix:	mvbf_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The threshold amount of new senior debt issuances at which the issuer must obtain the consent of the holder.

+ References

No definition available.

+ Details

Name:	mvbf_DebtInstrumentThresholdAmountOfNewSeniorDebtIssuanceThatIssuerMustObtainHolderConsent
Namespace Prefix:	mvbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

For the form of subordinated debt having, average borrowings during the period.

+ References

No definition available.

+ Details

Name:	mvbf_SubordinatedDebtAverageOutstandingAmount
Namespace Prefix:	mvbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

For the form of subordinated debt , maximum month-end borrowings during the period.

+ References

No definition available.

+ Details

Name:	mvbf_SubordinatedDebtMaximumMonthendOutstandingAmount
Namespace Prefix:	mvbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

+ Details

Name:	us-gaap_DebtConversionConvertedInstrumentAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

+ Details

Name:	us-gaap_DebtConversionConvertedInstrumentSharesIssued1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870

+ Details

Name:	us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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

- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

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 http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

+ Details

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

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Interest expense incurred during the reporting period on subordinated notes and debentures. Includes amortization of expenses incurred in the issuance of subordinated notes and debentures.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.8)
-URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260

+ Details

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

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

+ References

Reference 1: 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(19))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: 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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- References

No definition available.

+ Details

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

- Details

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

- Details

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

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mvbf_ConvertibleSubordinatedPromissoryNotesDue2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mvbf_DebtholderInvestmentAxis=mvbf_DebtholderInvestmentsLessThanThreeMillionDollarsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mvbf_DebtholderInvestmentAxis=mvbf_DebtholderInvestmentsOfThreeMillionDollarsOrGreaterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mvbf_DebtholderInvestmentAxis=mvbf_DebtholderInvestmentsOfTenMillionDollarsOrGreaterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

BORROWED FUNDS - Subordinated Debt (Details) - USD ($) $ / shares in Units, shares in Millions		12 Months Ended
	Jun. 30, 2014	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2007
Subordinated Debt
Balance at end of year		$ 17,524,000	$ 33,524,000
Interest expense on borrowed funds		1,756,000	2,242,000	$ 2,226,000
Subordinated Debt
Subordinated Debt
Balance at end of year		17,524,000	33,524,000	33,524,000
Average balance during the year		25,774,000	33,524,000	33,524,000
Maximum month-end balance		$ 33,524,000	$ 33,524,000	$ 33,524,000
Weighted-average rate during the year		6.81%	6.69%	6.64%
Weighted-average rate at December 31		6.57%	6.70%	6.63%
Interest expense on borrowed funds		$ 1,800,000	$ 2,200,000	$ 2,200,000
Subordinated debt converted, amount		$ 16,000,000
Subordinated debt converted into common stock (in shares)		1
Annual interest expense savings		$ 1,100,000
Subordinated Debentures \| Subordinated Debt
Subordinated Debt
Face amount of debt issued					$ 4,000,000
Subordinated Debentures \| LIBOR \| Subordinated Debt
Subordinated Debt
Variable rate basis spread		1.62%
Convertible Subordinated Promissory Notes Due 2024 \| Subordinated Debt
Subordinated Debt
Face amount of debt issued	$ 29,400,000
Debt instrument, investment amount of holder	100,000
Debt instrument, minimum ownership of common stock as percentage of principal acquired	$ 1,000,000
Term of debt instrument	10 years
Debt instrument, maximum interest rate after fifth anniversary		9.00%
Debt instrument, minimum period from issuance that principal may be prepaid		5 years
Debt instrument, threshold consecutive trading days for conversion after first, second, third, fourth, and fifth anniversaries of the issuance		30 days
Debt instrument, conversion price (in dollars per share)		$ 16
Debt instrument, notice period of intent to prepay		20 days
Debt instrument, issuance threshold amount requiring consent of holders		$ 15,000,000
Debt instrument, redemption price percentage		100.00%
Debt instrument, required period before redemption		5 years
Convertible Subordinated Promissory Notes Due 2024 \| Subordinated Debt \| Debtholder Investments Less Than Three Million Dollars
Subordinated Debt
Debt instrument, investment amount of holder		$ 3,000,000
Debt instrument, minimum ownership of common stock as percentage of principal acquired		30.00%
Interest rate on debt security		7.00%
Convertible Subordinated Promissory Notes Due 2024 \| Subordinated Debt \| Debtholder Investments Of Three Million Dollars Or Greater
Subordinated Debt
Debt instrument, investment amount of holder		$ 3,000,000
Debt instrument, minimum ownership of common stock as percentage of principal acquired		30.00%
Interest rate on debt security		7.50%
Convertible Subordinated Promissory Notes Due 2024 \| Subordinated Debt \| Debtholder Investments Of Ten Million Dollars Or Greater
Subordinated Debt
Debt instrument, investment amount of holder		$ 10,000,000
Interest rate on debt security		7.00%
Convertible Subordinated Promissory Notes Due 2024 \| LIBOR \| Subordinated Debt
Subordinated Debt
Debt instrument, basis spread on variable rate after fifth anniversary		5.00%