Loans and Allowance for Credit Losses - Allowance (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Changes in the allowance for loan losses
Beginning balance	$ 23,837	$ 17,603
Provision (release of allowance) for credit losses	4,455	1,330
Initial allowance on loans purchased with credit deterioration	1,217
Charge-offs	(4,847)	(1,124)
Recoveries	3,169	385
Ending balance	35,513	18,194
Individually evaluated for impairment		637
Collectively evaluated for impairment		17,557
Purchased credit impaired loans
Changes in the allowance for loan losses
Beginning balance		663
Provision (release of allowance) for credit losses		(50)
Recoveries		1
Ending balance		614
Collectively evaluated for impairment		614
Cumulative Effect, Period of Adoption, Adjustment
Changes in the allowance for loan losses
Beginning balance	7,682
Unfunded Commitments
Changes in the allowance for loan losses
Provision (release of allowance) for credit losses	100
Total commercial
Changes in the allowance for loan losses
Beginning balance	15,539	14,100
Provision (release of allowance) for credit losses	1,282	(938)
Initial allowance on loans purchased with credit deterioration	710
Charge-offs	(141)	0
Recoveries	29	8
Ending balance	14,735	13,170
Individually evaluated for impairment		442
Collectively evaluated for impairment		12,728
Total commercial \| Purchased credit impaired loans
Changes in the allowance for loan losses
Beginning balance		0
Provision (release of allowance) for credit losses		164
Recoveries		1
Ending balance		165
Collectively evaluated for impairment		165
Total commercial \| Cumulative Effect, Period of Adoption, Adjustment
Changes in the allowance for loan losses
Beginning balance	(2,684)
Total commercial \| Business
Changes in the allowance for loan losses
Beginning balance	8,771	8,027
Provision (release of allowance) for credit losses	681	(1,159)
Initial allowance on loans purchased with credit deterioration	710
Charge-offs	(141)	0
Recoveries	23	1
Ending balance	9,918	6,869
Individually evaluated for impairment		218
Collectively evaluated for impairment		6,651
Total commercial \| Business \| Purchased credit impaired loans
Changes in the allowance for loan losses
Beginning balance		0
Provision (release of allowance) for credit losses		111
Recoveries		1
Ending balance		112
Collectively evaluated for impairment		112
Total commercial \| Business \| Cumulative Effect, Period of Adoption, Adjustment
Changes in the allowance for loan losses
Beginning balance	(126)
Total commercial \| Real estate
Changes in the allowance for loan losses
Beginning balance	5,704	5,091
Provision (release of allowance) for credit losses	313	468
Initial allowance on loans purchased with credit deterioration	0
Charge-offs	0	0
Recoveries	6	7
Ending balance	3,177	5,566
Individually evaluated for impairment		224
Collectively evaluated for impairment		5,342
Total commercial \| Real estate \| Purchased credit impaired loans
Changes in the allowance for loan losses
Beginning balance		0
Provision (release of allowance) for credit losses		53
Recoveries		0
Ending balance		53
Collectively evaluated for impairment		53
Total commercial \| Real estate \| Cumulative Effect, Period of Adoption, Adjustment
Changes in the allowance for loan losses
Beginning balance	(2,846)
Total commercial \| Acquisition, development and construction
Changes in the allowance for loan losses
Beginning balance	1,064	982
Provision (release of allowance) for credit losses	288	(247)
Initial allowance on loans purchased with credit deterioration	0
Charge-offs	0	0
Recoveries	0	0
Ending balance	1,640	735
Individually evaluated for impairment		0
Collectively evaluated for impairment		735
Total commercial \| Acquisition, development and construction \| Cumulative Effect, Period of Adoption, Adjustment
Changes in the allowance for loan losses
Beginning balance	288
Residential real estate
Changes in the allowance for loan losses
Beginning balance	2,880	948
Provision (release of allowance) for credit losses	364	179
Initial allowance on loans purchased with credit deterioration	507
Charge-offs	(22)	0
Recoveries	0	0
Ending balance	7,618	1,127
Individually evaluated for impairment		84
Collectively evaluated for impairment		1,043
Residential real estate \| Purchased credit impaired loans
Changes in the allowance for loan losses
Beginning balance		544
Provision (release of allowance) for credit losses		(221)
Recoveries		0
Ending balance		323
Collectively evaluated for impairment		323
Residential real estate \| Cumulative Effect, Period of Adoption, Adjustment
Changes in the allowance for loan losses
Beginning balance	3,889
Home Equity
Changes in the allowance for loan losses
Beginning balance	131	128
Provision (release of allowance) for credit losses	(8)	1
Initial allowance on loans purchased with credit deterioration	0
Charge-offs	0	0
Recoveries	1	2
Ending balance	119	131
Individually evaluated for impairment		0
Collectively evaluated for impairment		131
Home Equity \| Cumulative Effect, Period of Adoption, Adjustment
Changes in the allowance for loan losses
Beginning balance	(5)
Consumer
Changes in the allowance for loan losses
Beginning balance	5,287	2,427
Provision (release of allowance) for credit losses	2,817	2,088
Initial allowance on loans purchased with credit deterioration	0
Charge-offs	(4,684)	(1,124)
Recoveries	3,139	375
Ending balance	13,041	3,766
Individually evaluated for impairment		111
Collectively evaluated for impairment		3,655
Consumer \| Purchased credit impaired loans
Changes in the allowance for loan losses
Beginning balance		119
Provision (release of allowance) for credit losses		7
Recoveries		0
Ending balance		126
Collectively evaluated for impairment		$ 126
Consumer \| Cumulative Effect, Period of Adoption, Adjustment
Changes in the allowance for loan losses
Beginning balance	$ 6,482

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

+ Details

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

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

+ Details

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

- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

- Definition

Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from purchase of loan. Excludes financing receivable purchased with credit deterioration, loan acquired through business combination or acquisition, and net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

+ Details

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

- Definition

Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

+ References

+ Details

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

- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

+ Details

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

- Definition

Amount of credit loss expense (reversal of expense) for financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(11))
-URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

+ Details

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

- Details

Name:	us-gaap_CreditLossStatusAxis=us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CumulativeEffectPeriodOfAdoptionAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_UnfundedLoanCommitmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mvbf_CommercialAcquisitionAndDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=mvbf_HomeEquityPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: