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Loans and Allowance for Loan and Lease Losses (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
loan
Mar. 31, 2014
loan
Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]      
Financing Receivable, Modifications, Recorded Investment $ 6,978,000us-gaap_FinancingReceivableModificationsRecordedInvestment   $ 8,746,000us-gaap_FinancingReceivableModificationsRecordedInvestment
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down 0us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 2us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 3,412,000us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1    
Foreclosure proceedings in process 277,000mpb_MortgageLoansInProcessOfForeclosureAmount   485,000mpb_MortgageLoansInProcessOfForeclosureAmount
Home Equity/ Home Equity Lines of Credit [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loan Terms 5 years    
Loan To Value Ratio 85.00%mpb_LoanToValueRatio
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
   
Financing Receivable, Modifications, Recorded Investment     5,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
Impaired Financing Receivable, Interest Income, Cash Basis Method        
Six Borrowers [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down     2,035,000us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
/ us-gaap_MajorCustomersAxis
= mpb_SixBorrowersMember
Residential mortgages [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loan Terms 30 years    
Loan To Value Ratio 100.00%mpb_LoanToValueRatio
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
   
Loan To Value Ratio, Exposure After Private Mortgage Insurance 85.00%mpb_LoanToValueRatioExposureAfterPrivateMortgageInsurance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
   
Financing Receivable, Modifications, Recorded Investment 601,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
  713,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Impaired Financing Receivable, Interest Income, Cash Basis Method        
Commercial and industrial [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loan Terms 1 year    
Loan To Value Ratio 80.00%mpb_LoanToValueRatio
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Financing Receivable, Modifications, Recorded Investment 20,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
  23,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Impaired Financing Receivable, Interest Income, Cash Basis Method        
Commercial real estate [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Financing Receivable, Modifications, Recorded Investment 6,357,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
  8,005,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Impaired Financing Receivable, Interest Income, Cash Basis Method        
Lease financing [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Portfolio Percentage 0.15%mpb_PortfolioPercentage
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
   
Nonaccruing [Member] | Two Large Relationships [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Financing Receivable, Modifications, Recorded Investment     4,680,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= mpb_NonaccruingMember
/ us-gaap_MajorCustomersAxis
= mpb_TwoLargeRelationshipsMember
Nonaccruing [Member] | 11 Loans with 7 Relationships [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Financing Receivable, Modifications, Recorded Investment 4,984,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= mpb_NonaccruingMember
/ us-gaap_MajorCustomersAxis
= mpb_ElevenLoansWithSevenRelationshipsMember
   
Nonaccruing [Member] | 1 Large Relationship [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Financing Receivable, Modifications, Recorded Investment 3,123,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= mpb_NonaccruingMember
/ us-gaap_MajorCustomersAxis
= mpb_OneLargeRelationshipMember
   
Nonaccruing [Member] | 14 Loans with 9 Relationships [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Financing Receivable, Modifications, Recorded Investment     6,711,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= mpb_NonaccruingMember
/ us-gaap_MajorCustomersAxis
= mpb_FourteenLoansWithNineRelationshipsMember
Accruing [Member] | 2 Relationship [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Financing Receivable, Modifications, Recorded Investment     1,964,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= mpb_AccruingMember
/ us-gaap_MajorCustomersAxis
= mpb_TwoRelationshipMember
Accruing [Member] | Six Borrowers [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Financing Receivable, Modifications, Recorded Investment 1,994,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= mpb_AccruingMember
/ us-gaap_MajorCustomersAxis
= mpb_SixBorrowersMember
   
Accruing [Member] | Six Borrowers [Member] | Residential Mortgage [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down     71,000us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= mpb_AccruingMember
/ us-gaap_MajorCustomersAxis
= mpb_SixBorrowersMember
Accruing [Member] | Residential mortgages [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Financing Receivable, Modifications, Recorded Investment 69,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= mpb_AccruingMember
   
Accruing [Member] | Commercial real estate [Member] | Two Large Relationships [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Financing Receivable, Modifications, Recorded Investment $ 1,925,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= mpb_AccruingMember
/ us-gaap_MajorCustomersAxis
= mpb_TwoLargeRelationshipsMember
   
Maximum [Member] | Home Equity/ Home Equity Lines of Credit [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loan Terms 20 years