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INTANGIBLE ASSETS (Details) (USD $)
0 Months Ended
Oct. 07, 2005
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Intangible assets        
Goodwill   $ 17,779,000us-gaap_Goodwill $ 17,779,000us-gaap_Goodwill  
Service office in the Charles Town area        
Intangible assets        
Assets 1,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= mvbf_ServiceOfficeInCharlesTownAreaMember
     
Deposits 17,100,000mvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits
/ us-gaap_BusinessAcquisitionAxis
= mvbf_ServiceOfficeInCharlesTownAreaMember
     
Goodwill 897,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= mvbf_ServiceOfficeInCharlesTownAreaMember
     
Service office in the Charles Town area | Core deposit intangibles        
Intangible assets        
Amortization period 10 years      
Original amount of intangible assets 128,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= mvbf_ServiceOfficeInCharlesTownAreaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
     
Accumulated amortization   127,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_BusinessAcquisitionAxis
= mvbf_ServiceOfficeInCharlesTownAreaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
   
Amount remaining to be amortized   1,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_BusinessAcquisitionAxis
= mvbf_ServiceOfficeInCharlesTownAreaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
   
PMG        
Intangible assets        
Goodwill       $ 16,900,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= mvbf_PotomacMortgageGroupMember