Leases - Schedule of Future Minimum Rental Payments of Operating Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
2021 Lease obligation	$ 2,426	$ 2,445
2022 Lease obligation	2,042	2,426
2023 Lease obligation	1,863	2,179
2024 Lease obligation	1,476	2,013
2025 Lease obligation	1,249	1,632
Lease obligation thereafter	$ 3,626	8,543
Lease obligation		19,238
2021 Sublease rental income		21
Sublease rental income		21
2021 Net rental expense		2,424
2022 Net rental expense		2,426
2023 Net rental expense		2,179
2024 Net rental expense		2,013
2025 Net rental expense		1,632
Net rental thereafter		8,543
Net rental expense		$ 19,217

Lessee operating lease liability payments due including undiscounted excess amount.

No definition available.

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

- Definition

Operating lease sublease rental income due next twelve months.

+ References

No definition available.

+ Details

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Namespace Prefix:	mpb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Operating lease sublease rental income receivable.

+ References

No definition available.

+ Details

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Namespace Prefix:	mpb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Operating leases future minimum payments due net rental expense current.

+ References

No definition available.

+ Details

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Namespace Prefix:	mpb_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Operating leases future minimum payments due net rental expense due in five years.

+ References

No definition available.

+ Details

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

- Definition

Operating leases future minimum payments due net rental expense due in four years.

+ References

No definition available.

+ Details

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Namespace Prefix:	mpb_
Data Type:	xbrli:monetaryItemType
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- Definition

Operating leases future minimum payments due net rental expense due in three years.

+ References

No definition available.

+ Details

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

- Definition

Operating leases future minimum payments due net rental expense due in two years.

+ References

No definition available.

+ Details

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Namespace Prefix:	mpb_
Data Type:	xbrli:monetaryItemType
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- Definition

Operating leases future minimum payments due net rental expense due thereafter.

+ References

No definition available.

+ Details

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

- Definition

Operating leases future minimum payments net rental expense due.

+ References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease due after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980

+ Details

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

- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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

- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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

- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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