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FAIR VALUE MEASUREMENTS - Quantitative Information (Details) (Non-recurring, Level III, USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Impaired loans | Appraisal of collateral
    
Quantitative information about assets measured at fair value on a non-recurring basis    
Fair Value 14,091us-gaap_AssetsFairValueDisclosure
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Impaired loans | Appraisal of collateral | Minimum
    
Fair Value Inputs [Abstract]    
Liquidation expenses (as a percent) 5.00%mvbf_FairValueInputsLiquidationExpensesAsPercentOfAppraisal
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Appraisal adjustments (as a percent) 20.00%mvbf_FairValueInputsAppraisalAdjustmentAsPercentOfAppraisal
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Impaired loans | Appraisal of collateral | Maximum
    
Fair Value Inputs [Abstract]    
Liquidation expenses (as a percent) 10.00%mvbf_FairValueInputsLiquidationExpensesAsPercentOfAppraisal
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Appraisal adjustments (as a percent) 30.00%mvbf_FairValueInputsAppraisalAdjustmentAsPercentOfAppraisal
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Other real estate owned | Appraisal of collateral
    
Quantitative information about assets measured at fair value on a non-recurring basis    
Fair Value 575us-gaap_AssetsFairValueDisclosure
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Other real estate owned | Appraisal of collateral | Minimum
    
Fair Value Inputs [Abstract]    
Liquidation expenses (as a percent) 5.00%mvbf_FairValueInputsLiquidationExpensesAsPercentOfAppraisal
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Appraisal adjustments (as a percent) 20.00%mvbf_FairValueInputsAppraisalAdjustmentAsPercentOfAppraisal
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Other real estate owned | Appraisal of collateral | Maximum
    
Fair Value Inputs [Abstract]    
Liquidation expenses (as a percent) 10.00%mvbf_FairValueInputsLiquidationExpensesAsPercentOfAppraisal
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Appraisal adjustments (as a percent) 30.00%mvbf_FairValueInputsAppraisalAdjustmentAsPercentOfAppraisal
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Mortgage servicing rights | Discounted cash flow
    
Fair Value Inputs [Abstract]    
Prepayment rate (as a percent) 12.00%us-gaap_FairValueInputsPrepaymentRate
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Cost of service (as a percent) 0.25%mvbf_FairValueInputsCostOfServiceRate
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Discount rate (as a percent) 12.00%us-gaap_FairValueInputsDiscountRate
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