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Leases - Narrative (Details) $ in Thousands | 12 Months Ended
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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: |