Fair Value Measurements - Quantitative Information About Level III Significant Unobservable Inputs (Details) $ in Thousands	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Non-recurring \| Other debt securities \| Level III
Quantitative Information about Level III Fair Value Measurements
Assets, fair value	$ 7,500	$ 7,500
Non-recurring \| Equity securities \| Level III
Quantitative Information about Level III Fair Value Measurements
Assets, fair value	33,986	32,155
Non-recurring \| Impaired loans
Quantitative Information about Level III Fair Value Measurements
Assets, fair value	22,045	21,980
Non-recurring \| Impaired loans \| Level III
Quantitative Information about Level III Fair Value Measurements
Assets, fair value	22,045	21,980
Non-recurring \| Other real estate owned
Quantitative Information about Level III Fair Value Measurements
Assets, fair value	1,334	2,330
Non-recurring \| Other real estate owned \| Level III
Quantitative Information about Level III Fair Value Measurements
Assets, fair value	1,334	2,330
Recurring \| Municipal Securities \| Level III
Quantitative Information about Level III Fair Value Measurements
Assets, fair value	$ 37,035	$ 41,763
Appraisal adjustments \| Non-recurring \| Impaired loans \| Appraisal of collateral \| Level III \| Minimum
Quantitative Information about Level III Fair Value Measurements
Impaired loans	0	0.10
Appraisal adjustments \| Non-recurring \| Impaired loans \| Appraisal of collateral \| Level III \| Maximum
Quantitative Information about Level III Fair Value Measurements
Impaired loans	0.20	0.20
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	0.10
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	0.20	0.20
Appraisal adjustments \| Recurring \| Municipal Securities \| Appraisal of bond \| Level III \| Minimum
Quantitative Information about Level III Fair Value Measurements
Municipal securities	0.05	0.01
Appraisal adjustments \| Recurring \| Municipal Securities \| Appraisal of bond \| Level III \| Maximum
Quantitative Information about Level III Fair Value Measurements
Municipal securities	0.15	0.20
Liquidation expense \| Non-recurring \| Impaired loans \| Appraisal of collateral \| Level III \| Minimum
Quantitative Information about Level III Fair Value Measurements
Impaired loans	0.06	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
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	0.06	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
Cost minus impairment \| Non-recurring \| Other debt securities \| Net asset value \| Level III
Quantitative Information about Level III Fair Value Measurements
Securities	0	0
Cost minus impairment \| Non-recurring \| Equity securities \| Net asset value \| Level III
Quantitative Information about Level III Fair Value Measurements
Securities		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 https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
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 https://asc.fasb.org/extlink&oid=126976982&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 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