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Stock Offerings (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 0 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2015
Sep. 08, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Stock offering            
Number of shares issued   9,283us-gaap_PreferredStockSharesIssued       9,283us-gaap_PreferredStockSharesIssued
SBLF capital received $ 48us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock          
Preferred stock, par value (in dollars per share)   $ 1,000us-gaap_PreferredStockParOrStatedValuePerShare       $ 1,000us-gaap_PreferredStockParOrStatedValuePerShare
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        
Conversion price (in dollars per share)   $ 16mvbf_ConvertiblePreferredStockConversionPrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
       
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
       
Preferred Class A            
Stock offering            
Dividend rate (as a percent)       1.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredClassAMember
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