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

Qualifying deferment status percentage of loan portfolio.

+ References

No definition available.

+ Details

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Namespace Prefix:	mpb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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

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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

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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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

+ Details

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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
-Name Accounting Standards Codification
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-Section S99
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-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

+ Details

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

- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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

Loans and Allowance for Loan and Lease Losses (Narrative) (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2021 USD ($) Loan	Dec. 31, 2020 USD ($) Loan	Jun. 30, 2020 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable deferred fees and costs	$ 16,554,000	$ 9,084,000
Allowance for loan losses	14,716,000	13,382,000
Loans outstanding, net	2,480,476,000	2,370,659,000
Financing receivable, modifications, recorded investment	$ 1,412,000	$ 1,480,000
Number of troubled debt restructured loans \| Loan	0	0
Loans and leases receivable, gross, carrying amount	$ 2,495,192,000	$ 2,384,041,000	$ 2,445,765,000
CARES Act [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and leases receivable, gross, carrying amount	$ 314,000	$ 11,681,000
CARES Act [Member] \| Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Qualifying deferment status percentage of loan portfolio	1.00%	1.00%
Nonaccruing [Member] \| Nine Loans With Seven Relationships [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, modifications, recorded investment	$ 963,000	$ 1,017,000
Residential Portfolio [Member] \| Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, modifications, recorded investment	490,000	510,000
Loans and leases receivable, gross, carrying amount	196,691,000	201,841,000	$ 218,352,000
Residential Portfolio [Member] \| Residential Mortgage [Member] \| Accruing \| Three Unrelated Borrowers [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, modifications, recorded investment	449,000	463,000
Residential Portfolio [Member] \| Residential Mortgage [Member] \| Nonaccruing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, modifications, recorded investment	41,000	47,000
Residential Portfolio [Member] \| Residential Mortgage [Member] \| Nonaccruing [Member] \| Nine Loans With Seven Relationships [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, modifications, recorded investment		1,017,000
Residential Portfolio [Member] \| Residential Mortgage [Member] \| Nonaccruing [Member] \| One Large Relationships [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, modifications, recorded investment		535,000
Residential Portfolio [Member] \| Residential Mortgage [Member] \| Nonaccruing [Member] \| Four Loans With Two Relationships [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, modifications, recorded investment		398,000
Commercial Real Estate [Member] \| Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, modifications, recorded investment		31,000
PPP Loans [Member] \| Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	0
Loans outstanding, net	391,826,000	388,313,000
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	893,000
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	23,000
Commercial and Industrial [Member] \| Residential Portfolio [Member] \| Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, modifications, recorded investment		$ 6,000
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	$ 6,000