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Leases - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) Lease	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Lessee Lease Description [Line Items]
Number of leases not yet commenced | Lease	0
Operating and Finance Leases Related Party
Lessee Lease Description [Line Items]
Rent expense paid to related parties	$ 274	$ 274	$ 269
2023	274
2024	274
2025	185
2026	178
2027	178
thereafter	$ 3,100

X

- Definition

Lessee operating and finance lease liability payments due after year five.

+ References

No definition available.

+ Details

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

X

- Definition

Lessee operating and finance lease liability payments due next twelve months.

+ References

No definition available.

+ Details

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

X

- Definition

Lessee operating and finance lease liability payments due year five.

+ References

No definition available.

+ Details

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

X

- Definition

Lessee operating and finance lease liability payments due year four.

+ References

No definition available.

+ Details

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

X

- Definition

Lessee operating and finance lease liability payments due year three.

+ References

No definition available.

+ Details

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

X

- Definition

Lessee operating and finance lease liability payments due year two.

+ References

No definition available.

+ Details

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

X

- Definition

Number of leases not yet commenced.

+ References

No definition available.

+ Details

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

X

- Definition

Operating and finance leases rent expense net.

+ References

No definition available.

+ Details

Name:	mpb_OperatingAndFinanceLeasesRentExpenseNet
Namespace Prefix:	mpb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

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

X

- Details

Name:	srt_CounterpartyNameAxis=mpb_OperatingAndFinanceLeasesRelatedPartyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: