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Merger (Fair Value Adjustments) (Details) (Phoenix Bancorp Inc. [Member], USD $)
In Thousands, unless otherwise specified
 0 Months Ended
Mar. 01, 2015
Mar. 31, 2015
Phoenix Bancorp Inc. [Member]
    
Business Acquisition [Line Items]    
Gross amortized cost basis $ 113,090mpb_PurchasedLoansGrossAmortizedCostBasis
/ us-gaap_BusinessAcquisitionAxis
= mpb_PhoenixBancorpIncorporatedMember		  
Market rate adjustment 222mpb_PurchasedLoansMarketRateAdjustment
/ us-gaap_BusinessAcquisitionAxis
= mpb_PhoenixBancorpIncorporatedMember		  
Credit fair value adjustment on pools of homogeneous loans (1,462)mpb_PurchasedLoansCreditFairValueAdjustmentOnPoolsOfHomogeneousLoans
/ us-gaap_BusinessAcquisitionAxis
= mpb_PhoenixBancorpIncorporatedMember		  
Credit fair value adjustment on impaired loans (1,143)mpb_PurchasedLoansCreditFairValueAdjustmentOnImpairedLoans
/ us-gaap_BusinessAcquisitionAxis
= mpb_PhoenixBancorpIncorporatedMember		  
Fair value of purchased loans $ 110,707us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets
/ us-gaap_BusinessAcquisitionAxis
= mpb_PhoenixBancorpIncorporatedMember		 $ 110,707us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets
/ us-gaap_BusinessAcquisitionAxis
= mpb_PhoenixBancorpIncorporatedMember