Loans and Allowance for Credit Losses - Loans - Schedule of ACL Loans by Portfolio Segment (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended	12 Months Ended
Apr. 30, 2025	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance		$ 35,838	$ 33,524	$ 35,514	$ 34,187	$ 34,187
PCD Loans		343		343
Charge offs		(909)	(62)	(924)	(112)
Recoveries		98	44	116	50
Net loans (charged off) recovered		(811)	(18)	(808)	(62)
Provision/(Benefit) for credit losses		2,245	1,782	2,566	1,163
Allowance for loan losses, ending balance		37,615	35,288	37,615	35,288	35,514
William Penn Acquisition
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision expense	$ 2,300
Commercial real estate \| CRE Nonowner Occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance		10,380	10,417	11,047	10,267	10,267
PCD Loans		89		89
Charge offs		(691)	0	(691)	0	0
Recoveries		1	0	2	0	2
Net loans (charged off) recovered		(690)	0	(689)	0
Provision/(Benefit) for credit losses		819	230	151	380
Allowance for loan losses, ending balance		10,598	10,647	10,598	10,647	11,047
Commercial real estate \| CRE Owner Occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance		5,722	5,602	5,243	5,646	5,646
PCD Loans		100		100
Charge offs		0	0	0	0	0
Recoveries		0	4	0	4	4
Net loans (charged off) recovered		0	4	0	4
Provision/(Benefit) for credit losses		608	224	1,087	180
Allowance for loan losses, ending balance		6,430	5,830	6,430	5,830	5,243
Commercial real estate \| Multifamily
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance		3,324	2,370	3,432	2,202	2,202
PCD Loans		31		31
Charge offs		0	0	0	0	0
Recoveries		0	0	0	0	0
Net loans (charged off) recovered		0	0	0	0
Provision/(Benefit) for credit losses		(1,377)	839	(1,485)	1,007
Allowance for loan losses, ending balance		1,978	3,209	1,978	3,209	3,432
Commercial real estate \| Farmland
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance		2,075	2,002	1,932	2,064	2,064
PCD Loans		0		0
Charge offs		0	0	0	0	0
Recoveries		0	0	0	0	0
Net loans (charged off) recovered		0	0	0	0
Provision/(Benefit) for credit losses		23	57	166	(5)
Allowance for loan losses, ending balance		2,098	2,059	2,098	2,059	1,932
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance		7,864	6,500	7,122	7,131	7,131
PCD Loans		36		36
Charge offs		(203)	(56)	(203)	(56)	(819)
Recoveries		3	0	9	0	1
Net loans (charged off) recovered		(200)	(56)	(194)	(56)
Provision/(Benefit) for credit losses		402	490	1,138	(141)
Allowance for loan losses, ending balance		8,102	6,934	8,102	6,934	7,122
Construction \| Residential Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance		830	1,176	931	1,256	1,256
PCD Loans		0		0
Charge offs		0	0	0	0	0
Recoveries		0	0	0	0	0
Net loans (charged off) recovered		0	0	0	0
Provision/(Benefit) for credit losses		128	(47)	27	(127)
Allowance for loan losses, ending balance		958	1,129	958	1,129	931
Construction \| Other Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance		1,899	2,171	2,131	2,146	2,146
PCD Loans		0		0
Charge offs		0	0	0	0	0
Recoveries		0	0	0	0	0
Net loans (charged off) recovered		0	0	0	0
Provision/(Benefit) for credit losses		537	(158)	305	(133)
Allowance for loan losses, ending balance		2,436	2,013	2,436	2,013	2,131
Residential mortgage \| 1-4 Family 1st Lien
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance		1,582	1,271	1,503	1,207	1,207
PCD Loans		37		37
Charge offs		0	0	0	(7)	(7)
Recoveries		83	7	85	7	16
Net loans (charged off) recovered		83	7	85	0
Provision/(Benefit) for credit losses		494	71	571	142
Allowance for loan losses, ending balance		2,196	1,349	2,196	1,349	1,503
Residential mortgage \| 1-4 Family Rental
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance		1,740	1,539	1,756	1,859	1,859
PCD Loans		47		47
Charge offs		0	(2)	0	(2)	(2)
Recoveries		0	22	0	22	22
Net loans (charged off) recovered		0	20	0	20
Provision/(Benefit) for credit losses		471	145	455	(175)
Allowance for loan losses, ending balance		2,258	1,704	2,258	1,704	1,756
Residential mortgage \| HELOC and Junior Liens
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance		404	457	392	389	389
PCD Loans		3		3
Charge offs		0	0	0	(21)	(21)
Recoveries		0	0	0	0	0
Net loans (charged off) recovered		0	0	0	(21)
Provision/(Benefit) for credit losses		113	(60)	125	29
Allowance for loan losses, ending balance		520	397	520	397	392
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance		18	19	25	20	20
PCD Loans		0		0
Charge offs		(15)	(4)	(30)	(26)	(52)
Recoveries		11	11	20	17	39
Net loans (charged off) recovered		(4)	7	(10)	(9)
Provision/(Benefit) for credit losses		27	(9)	26	6
Allowance for loan losses, ending balance		$ 41	$ 17	$ 41	$ 17	$ 25

Financing Receivable, Purchased with Credit Deterioration, Provision Expense

No definition available.

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

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

+ Details

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

- Definition

Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (4)
-Publisher SEC

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

- Definition

Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-22

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, excluding accrued interest, of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 19
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-19

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestPurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=mpb_WilliamPennAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mpb_CRENonownerOccupiedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mpb_CREOwnerOccupiedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=srt_MultifamilyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mpb_FarmlandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=mpb_CommercialAndIndustrialLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConstructionLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mpb_ResidentialConstructionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mpb_OtherConstructionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mpb_A14Family1stLienMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mpb_A14FamilyRentalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mpb_HELOCAndJuniorLiensMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: