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Merger (Fair Value of Loans Acquired) (Details) (Phoenix Bancorp Inc. [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Phoenix Bancorp Inc. [Member]
 
Business Acquisition [Line Items]  
Contractually required principal and interest at acquisition $ 3,548us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= mpb_PhoenixBancorpIncorporatedMember
Contractual cash flows not expected to be collected (nonaccretable discount) (663)us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference
/ us-gaap_BusinessAcquisitionAxis
= mpb_PhoenixBancorpIncorporatedMember
Expected cash flows at acquisition 2,885us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= mpb_PhoenixBancorpIncorporatedMember
Interest component of expected cash flows (accretable discount) (480)us-gaap_CertainLoansAcquiredInTransferAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= mpb_PhoenixBancorpIncorporatedMember
Fair value of acquired loans $ 2,405us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= mpb_PhoenixBancorpIncorporatedMember