Investment Securities - Amortized Cost and Fair Values of Investment Securities Available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Amortized cost and fair values of investment securities available-for-sale
Amortized Cost	$ 427,128	$ 421,272
Unrealized Gain	2,485	4,833
Unrealized Loss	(49,799)	(4,639)
Investment securities available-for-sale	379,814	421,466
Total debt securities
Amortized cost and fair values of investment securities available-for-sale
Amortized Cost	426,304	420,394
Unrealized Gain	2,485	4,833
Unrealized Loss	(49,799)	(4,639)
Investment securities available-for-sale	378,990	420,588
United States government agency securities
Amortized cost and fair values of investment securities available-for-sale
Amortized Cost	51,436	41,105
Unrealized Gain	15	228
Unrealized Loss	(6,637)	(896)
Investment securities available-for-sale	44,814	40,437
United States sponsored mortgage-backed securities
Amortized cost and fair values of investment securities available-for-sale
Amortized Cost	68,267	77,519
Unrealized Gain	0	222
Unrealized Loss	(11,696)	(1,633)
Investment securities available-for-sale	56,571	76,108
United States treasury securities
Amortized cost and fair values of investment securities available-for-sale
Amortized Cost	130,689	112,133
Unrealized Gain	48	0
Unrealized Loss	(9,828)	(1,744)
Investment securities available-for-sale	120,909	110,389
Municipal securities
Amortized cost and fair values of investment securities available-for-sale
Amortized Cost	157,842	171,044
Unrealized Gain	2,412	4,334
Unrealized Loss	(21,618)	(366)
Investment securities available-for-sale	138,636	175,012
Corporate debt securities
Amortized cost and fair values of investment securities available-for-sale
Amortized Cost	10,570	11,093
Unrealized Gain	10	49
Unrealized Loss	(20)	0
Investment securities available-for-sale	10,560	11,142
Other debt securities
Amortized cost and fair values of investment securities available-for-sale
Amortized Cost	7,500	7,500
Unrealized Gain	0	0
Unrealized Loss	0	0
Investment securities available-for-sale	7,500	7,500
Other securities
Amortized cost and fair values of investment securities available-for-sale
Amortized Cost	824	878
Unrealized Gain	0	0
Unrealized Loss	0	0
Investment securities available-for-sale	$ 824	$ 878

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

+ Details

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

- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

+ Details

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

- Definition

Amortized cost of 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 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

+ Details

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

- Definition

Amount excluding accrued interest, of 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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_OtherDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=mvbf_OtherSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: