Derivative Financial Instruments - Notional Amount and Fair Value of Mortgage Banking Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Mortgage Banking Derivative Financial Instruments \| Interest Rate Lock Commitments \| Positive
Derivative [Line Items]
Notional Amount	$ 2,285	$ 274
Asset (Liability) Fair Value	14	3
Mortgage Banking Derivative Financial Instruments \| Interest Rate Lock Commitments \| Negative
Derivative [Line Items]
Notional Amount	4,248	5,252
Asset (Liability) Fair Value	(22)	(40)
Mortgage Banking Derivative Financial Instruments \| Forward Commitments \| Positive
Derivative [Line Items]
Notional Amount	1,762	4,750
Asset (Liability) Fair Value	6	43
Mortgage Banking Derivative Financial Instruments \| Forward Commitments \| Negative
Derivative [Line Items]
Notional Amount	3,442	0
Asset (Liability) Fair Value	(15)	0
Interest Rate Swap with Customers \| Commercial Loan \| Positive
Derivative [Line Items]
Notional Amount	36,644	16,650
Asset (Liability) Fair Value	251	164
Interest Rate Swap with Customers \| Commercial Loan \| Negative
Derivative [Line Items]
Notional Amount	106,434	107,145
Asset (Liability) Fair Value	(11,431)	(11,533)
Interest Rate Swap with Counterparties \| Commercial Loan \| Positive
Derivative [Line Items]
Notional Amount	106,434	107,145
Asset (Liability) Fair Value	11,431	11,533
Interest Rate Swap with Counterparties \| Commercial Loan \| Negative
Derivative [Line Items]
Notional Amount	36,644	16,650
Asset (Liability) Fair Value	(251)	(164)
Interest Rate Swaps Used In Cash Flow Hedges \| Cash Flow Hedging \| Positive
Derivative [Line Items]
Notional Amount	190,000	0
Asset (Liability) Fair Value	3,589	0
Interest Rate Swaps Used In Cash Flow Hedges \| Cash Flow Hedging \| Negative
Derivative [Line Items]
Notional Amount	0	0
Asset (Liability) Fair Value	$ 0	$ 0

Fair value of the assets less the liabilities of a derivative or group of derivatives.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-10

+ Details

Name:	us-gaap_DerivativeFairValueOfDerivativeNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480237/815-40-50-5

+ Details

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

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A

+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=mpb_MortgageBankingDerivativeFinancialInstrumentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	mpb_FairValueAxis=mpb_PositiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mpb_FairValueAxis=mpb_NegativeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=mpb_InterestRateSwapWithCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=mpb_InterestRateSwapWithCounterpartiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=mpb_InterestRateSwapsUsedInCashFlowHedgesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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