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STOCK OFFERING (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2014
Mar. 31, 2013
Sep. 30, 2013
Sep. 08, 2011
Stock offering            
Number of shares issued 9,283us-gaap_PreferredStockSharesIssued 8,500us-gaap_PreferredStockSharesIssued        
Stock offering in process $ 5,588us-gaap_StockIssuedDuringPeriodValueNewIssues $ 23,109us-gaap_StockIssuedDuringPeriodValueNewIssues        
SBLF capital received 7,834us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock          
Preferred stock, par value (in dollars per share) $ 1,000us-gaap_PreferredStockParOrStatedValuePerShare $ 1,000us-gaap_PreferredStockParOrStatedValuePerShare        
Proceeds from issuance of shares under dividend reinvestment plan 180us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan 913us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan        
Series B Preferred Stock            
Stock offering            
Number of shares issued     400us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
     
Dividend rate (as a percent)     6.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
     
Period from first, second, third, fourth, and fifth anniversary of original issue date that stock may be convertible     30 days      
Series C Preferred Stock            
Stock offering            
Number of shares issued     383us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
     
Dividend rate (as a percent)     6.50%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
     
Period from first, second, third, fourth, and fifth anniversary of original issue date that stock may be convertible     30 days      
Conversion price (in dollars per share)     16mvbf_ConvertiblePreferredStockConversionPrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
     
Common Class A            
Stock offering            
Stock offering (in shares)   610,194us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
  2,265,054us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
361,865us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Stock offering in process   9,800us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
  27,100us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
5,800us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Preferred Class A            
Stock offering            
Dividend rate (as a percent) 1.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember
         
Stock offering (in shares)           8,500us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember
SBLF capital received           8,500us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember
Preferred stock, par value (in dollars per share)           $ 1,000us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember
Preferred Class A | Through 8 March 2016            
Stock offering            
Dividend rate (as a percent) 1.00%us-gaap_PreferredStockDividendRatePercentage
/ mvbf_DividendUtilizationPeriodAxis
= mvbf_Through8March2016Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember
         
Preferred Class A | After 8 March 2016            
Stock offering            
Dividend rate (as a percent) 9.00%us-gaap_PreferredStockDividendRatePercentage
/ mvbf_DividendUtilizationPeriodAxis
= mvbf_After8March2016Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember
         
Parent Company            
Stock offering            
SBLF capital received $ 7,834us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember