Financing receivable deferred fees and costs.

No definition available.

Name:	mpb_FinancingReceivableDeferredFeesAndCosts
Namespace Prefix:	mpb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of borrowers.

+ References

No definition available.

+ Details

Name:	mpb_NumberOfBorrowers
Namespace Prefix:	mpb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

+ Details

Name:	us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L.1)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707

+ Details

Name:	us-gaap_LoansAndLeasesReceivableAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This is the sum of principal amount outstanding for both securitized and unsecuritized loans of all types.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=mpb_NonaccruingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=mpb_EightLoansWithFiveRelationshipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=mpb_OneLargeRelationshipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=mpb_AccruingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=mpb_ThreeUnrelatedBorrowersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mpb_PaycheckProtectionProgramLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=mpb_SmallBusinessAdministrationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix:
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- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mpb_CommercialAndIndustrialLoansMember
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Loans and Allowance for Loan and Lease Losses (Narrative) (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) Loan Borrower	Dec. 31, 2019 USD ($) Loan	Jun. 30, 2019 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable deferred fees and costs	$ 18,066,000	$ 1,081,000
Allowance for loan losses	11,067,000	9,515,000
Loans outstanding	2,445,765,000	1,762,756,000	$ 1,688,173,000
Financing receivable, modifications, recorded investment	$ 948,000	$ 2,238,000
Number of troubled debt restructured loans \| Loan	0	0
Number of borrowers \| Borrower	1,019
Aggregate loans outstanding	$ 444,886,000
Nonaccruing [Member] \| Seven Loans with Five Relationships [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, modifications, recorded investment	471,000
Nonaccruing [Member] \| Eight Loans with Five Relationships [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, modifications, recorded investment		$ 1,748,000
Nonaccruing [Member] \| One Large Relationships [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, modifications, recorded investment		1,252,000
Residential Portfolio [Member] \| Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans outstanding	218,352,000	236,724,000	$ 249,114,000
Financing receivable, modifications, recorded investment	489,000	490,000
Residential Portfolio [Member] \| Residential Mortgage [Member] \| Accruing \| Three Unrelated Borrowers [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, modifications, recorded investment	477,000	$ 490,000
Residential Portfolio [Member] \| Residential Mortgage [Member] \| Nonaccruing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, modifications, recorded investment	11,000
PPP Loans [Member] \| Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	0
Loans outstanding	588,667,000
Commercial Real Estate [Member] \| Residential Portfolio [Member] \| Residential Mortgage [Member] \| Nonaccruing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, modifications, recorded investment	420,000
Commercial Real Estate - Construction [Member] \| Residential Portfolio [Member] \| Residential Mortgage [Member] \| Nonaccruing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, modifications, recorded investment	32,000
Commercial and Industrial [Member] \| Residential Portfolio [Member] \| Residential Mortgage [Member] \| Nonaccruing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, modifications, recorded investment	$ 7,000