FAIR VALUE MEASUREMENTS - Quantitative Information About Level III Significant Unobservable Inputs (Details) $ in Thousands	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Non-recurring \| Other debt securities \| Level III
Quantitative Information about Level III Fair Value Measurements
Fair Value	$ 7,500
Non-recurring \| Equity Securities \| Level III
Quantitative Information about Level III Fair Value Measurements
Fair Value		$ 18,514
Non-recurring \| Impaired loans
Quantitative Information about Level III Fair Value Measurements
Fair Value	14,098	8,909
Non-recurring \| Impaired loans \| Level III
Quantitative Information about Level III Fair Value Measurements
Fair Value	14,098	8,909
Non-recurring \| Other real estate owned
Quantitative Information about Level III Fair Value Measurements
Fair Value	5,730	1,397
Non-recurring \| Other real estate owned \| Level III
Quantitative Information about Level III Fair Value Measurements
Fair Value	5,730	1,397
Recurring \| Equity Securities \| Level III
Quantitative Information about Level III Fair Value Measurements
Fair Value	27,113
Recurring \| Municipal Securities \| Level III
Quantitative Information about Level III Fair Value Measurements
Fair Value	$ 43,679	37,259
Recurring \| Interest rate lock commitment \| Level III
Quantitative Information about Level III Fair Value Measurements
Fair Value		$ 1,660
Appraisal adjustments \| Non-recurring \| Impaired loans \| Appraisal of collateral \| Level III \| Minimum
Quantitative Information about Level III Fair Value Measurements
Impaired loans	0.20	0.20
Appraisal adjustments \| Non-recurring \| Impaired loans \| Appraisal of collateral \| Level III \| Maximum
Quantitative Information about Level III Fair Value Measurements
Impaired loans	0.62	0.62
Appraisal adjustments \| Non-recurring \| Other real estate owned \| Appraisal of collateral \| Level III \| Minimum
Quantitative Information about Level III Fair Value Measurements
Other real estate owned	0.20	0.20
Appraisal adjustments \| Non-recurring \| Other real estate owned \| Appraisal of collateral \| Level III \| Maximum
Quantitative Information about Level III Fair Value Measurements
Other real estate owned	0.30	0.30
Appraisal adjustments \| Recurring \| Municipal Securities \| Appraisal of bond \| Level III \| Minimum
Quantitative Information about Level III Fair Value Measurements
Municipal securities	0.05	0.05
Appraisal adjustments \| Recurring \| Municipal Securities \| Appraisal of bond \| Level III \| Maximum
Quantitative Information about Level III Fair Value Measurements
Municipal securities	0.15	0.15
Liquidation expense \| Non-recurring \| Impaired loans \| Appraisal of collateral \| Level III \| Minimum
Quantitative Information about Level III Fair Value Measurements
Impaired loans	0.05	0.05
Liquidation expense \| Non-recurring \| Impaired loans \| Appraisal of collateral \| Level III \| Maximum
Quantitative Information about Level III Fair Value Measurements
Impaired loans	0.10	0.10
Liquidation expense \| Non-recurring \| Other real estate owned \| Appraisal of collateral \| Level III \| Minimum
Quantitative Information about Level III Fair Value Measurements
Other real estate owned	0.05	0.05
Liquidation expense \| Non-recurring \| Other real estate owned \| Appraisal of collateral \| Level III \| Maximum
Quantitative Information about Level III Fair Value Measurements
Other real estate owned	0.10	0.10
Pull through rates \| Recurring \| Interest rate lock commitment \| Pricing model \| Level III \| Minimum
Quantitative Information about Level III Fair Value Measurements
Derivative asset measurement input		0.77
Pull through rates \| Recurring \| Interest rate lock commitment \| Pricing model \| Level III \| Maximum
Quantitative Information about Level III Fair Value Measurements
Derivative asset measurement input		0.82
Cost minus impairment \| Non-recurring \| Other debt securities \| Net asset value \| Level III
Quantitative Information about Level III Fair Value Measurements
Securities	0
Cost minus impairment \| Non-recurring \| Equity Securities \| Net asset value \| Level III
Quantitative Information about Level III Fair Value Measurements
Securities	0	0

Impaired Loans, Measurement Input

No definition available.

Name:	mvbf_ImpairedLoansMeasurementInput
Namespace Prefix:	mvbf_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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

- Definition

Value of input used to measure investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Value of input used to measure derivative asset.

+ References

+ Details

Name:	us-gaap_DerivativeAssetMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Value of input used to measure investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

+ Details

Name:	us-gaap_EquitySecuritiesFvNiMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Value of input used to measure real estate owned by financial institution by financial institution which is not directly related to its business.

+ References

+ Details

Name:	us-gaap_OtherRealEstateOwnedMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant