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Preferred Stock (Small Business Lending Fund) (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Preferred Stock [Member] | Phoenix Bancorp Inc. [Member]    
Class of Stock [Line Items]    
Preferred Stock, Shares Issued 1,750us-gaap_PreferredStockSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= mpb_PhoenixBancorpIncorporatedMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredStockMember
 
Series C Preferred Stock [Member]    
Class of Stock [Line Items]    
Preferred Stock, Shares Issued 1,750us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
0us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
Preferred Stock, Liquidation Preference Per Share $ 1,000us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
 
Preferred Stock, Dividend Rate, Percentage 1.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
 
Preferred stock percentage of liquidation preference. 100.00%mpb_PreferredStockPercentageOfLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
 
Preferred stock liquidation incremental percentage 25.00%mpb_PreferredStockLiquidationIncrementalPercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
 
Preferred stock liquidation percentage of less than 25% of original issued shares 100.00%mpb_PreferredStockLiquidationPercentageOfLessThanTwentyFivePercentOfOriginalIssuedShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
 
Series C Preferred Stock [Member] | Scenario, Plan [Member]    
Class of Stock [Line Items]    
Preferred Stock, Dividend Rate, Percentage 9.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPlanMember
 
Series C Preferred Stock [Member] | Phoenix Bancorp Inc. [Member]    
Class of Stock [Line Items]    
Preferred Stock, Shares Issued 1,750us-gaap_PreferredStockSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= mpb_PhoenixBancorpIncorporatedMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
 
Preferred Stock, Liquidation Preference Per Share $ 1,000us-gaap_PreferredStockLiquidationPreference
/ us-gaap_BusinessAcquisitionAxis
= mpb_PhoenixBancorpIncorporatedMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember