Regulatory Matters - Schedule of Regulatory Capital Levels And Related Ratios (Details) $ in Thousands	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Capital Adequacy, Ratio
Tier 1 Capital (to Average Assets)	0.040
Common Equity Tier 1 Capital (to Risk-Weighted Assets)	4.50%
Tier 1 Capital (to Risk-Weighted Assets)	0.060
Total Capital (to Risk-Weighted Assets)	0.080
Parent Company
Actual, Amount
Tier 1 Capital (to Average Assets)	$ 668,092	$ 535,501
Common Equity Tier 1 Capital (to Risk-Weighted Assets)	668,092	535,501
Tier 1 Capital (to Risk-Weighted Assets)	668,092	535,501
Total Capital (to Risk-Weighted Assets)	$ 706,029	$ 618,971
Actual, Ratio
Tier 1 Capital (to Average Assets)	0.110	0.100
Common Equity Tier 1 Capital (to Risk-Weighted Assets)	13.50%	11.90%
Tier 1 Capital (to Risk-Weighted Assets)	0.135	0.119
Total Capital (to Risk-Weighted Assets)	0.143	0.138
Capital Adequacy, Amount
Tier 1 Capital (to Average Assets)	$ 242,447	$ 214,621
Common Equity Tier 1 Capital (to Risk-Weighted Assets)	345,190	313,979
Tier 1 Capital (to Risk-Weighted Assets)	419,160	381,261
Total Capital (to Risk-Weighted Assets)	$ 517,785	$ 470,969
Capital Adequacy, Ratio
Tier 1 Capital (to Average Assets)	0.040	0.040
Common Equity Tier 1 Capital (to Risk-Weighted Assets)	7.00%	7.00%
Tier 1 Capital (to Risk-Weighted Assets)	0.085	0.085
Total Capital (to Risk-Weighted Assets)	0.105	0.105
Subsidiaries
Actual, Amount
Tier 1 Capital (to Average Assets)	$ 656,480	$ 495,729
Common Equity Tier 1 Capital (to Risk-Weighted Assets)	656,480	495,729
Tier 1 Capital (to Risk-Weighted Assets)	656,480	495,729
Total Capital (to Risk-Weighted Assets)	$ 694,417	$ 533,458
Actual, Ratio
Tier 1 Capital (to Average Assets)	0.109	0.092
Common Equity Tier 1 Capital (to Risk-Weighted Assets)	13.40%	11.10%
Tier 1 Capital (to Risk-Weighted Assets)	0.134	0.111
Total Capital (to Risk-Weighted Assets)	0.141	0.119
Capital Adequacy, Amount
Tier 1 Capital (to Average Assets)	$ 241,963	$ 214,461
Common Equity Tier 1 Capital (to Risk-Weighted Assets)	344,074	313,456
Tier 1 Capital (to Risk-Weighted Assets)	417,804	380,625
Total Capital (to Risk-Weighted Assets)	$ 516,111	$ 470,183
Capital Adequacy, Ratio
Tier 1 Capital (to Average Assets)	0.040	0.040
Common Equity Tier 1 Capital (to Risk-Weighted Assets)	7.00%	7.00%
Tier 1 Capital (to Risk-Weighted Assets)	0.085	0.085
Total Capital (to Risk-Weighted Assets)	0.105	0.105
To Be Well-Capitalized Under Prompt Corrective Action Provisions, Amount
Tier 1 Capital (to Average Assets)	$ 302,453	$ 268,076
Common Equity Tier 1 Capital (to Risk-Weighted Assets)	319,497	291,066
Tier 1 Capital (to Risk-Weighted Assets)	393,227	358,235
Total Capital (to Risk-Weighted Assets)	$ 491,534	$ 447,794
To Be Well-Capitalized Under Prompt Corrective Action Provisions, Ratio
Tier 1 Capital (to Average Assets)	0.050	0.050
Common Equity Tier 1 Capital (to Risk-Weighted Assets)	6.50%	6.50%
Tier 1 Capital (to Risk-Weighted Assets)	0.080	0.080
Total Capital (to Risk-Weighted Assets)	0.100	0.100

Banking Regulation, Actual, Amount

No definition available.

Name:	mpb_BankingRegulationActualAmountAbstract
Namespace Prefix:	mpb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Banking Regulation, Actual, Ratio

+ References

No definition available.

+ Details

Name:	mpb_BankingRegulationActualRatioAbstract
Namespace Prefix:	mpb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Banking Regulation, Capital Adequacy, Amount

+ References

No definition available.

+ Details

Name:	mpb_BankingRegulationCapitalAdequacyAmountAbstract
Namespace Prefix:	mpb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Banking Regulation, Capital Adequacy, Ratio

+ References

No definition available.

+ Details

Name:	mpb_BankingRegulationCapitalAdequacyRatioAbstract
Namespace Prefix:	mpb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Banking Regulation, To Be Well-Capitalized Under Prompt Corrective Action Provisions, Amount

+ References

No definition available.

+ Details

Name:	mpb_BankingRegulationToBeWellCapitalizedUnderPromptCorrectiveActionProvisionsAmountAbstract
Namespace Prefix:	mpb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Banking Regulation, To Be Well-Capitalized Under Prompt Corrective Action Provisions, Ratio

+ References

No definition available.

+ Details

Name:	mpb_BankingRegulationToBeWellCapitalizedUnderPromptCorrectiveActionProvisionsRatioAbstract
Namespace Prefix:	mpb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Tier One Risk Based Capital Required For Capital Adequacy With Buffer

+ References

No definition available.

+ Details

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

- Definition

Tier One Risk Based Capital Required For Capital Adequacy With Buffer To Risk Weighted Assets

+ References

No definition available.

+ Details

Name:	mpb_TierOneRiskBasedCapitalRequiredForCapitalAdequacyWithBufferToRiskWeightedAssets
Namespace Prefix:	mpb_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Tier One Risk Based Common Equity Capital.

+ References

No definition available.

+ Details

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

- Definition

Tier One Risk Based Common Equity Capital Required For Capital Adequacy.

+ References

No definition available.

+ Details

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

- Definition

Tier One Risk Based Common Equity Capital Required For Capital Adequacy To Risk Weighted Assets.

+ References

No definition available.

+ Details

Name:	mpb_TierOneRiskBasedCommonEquityCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Namespace Prefix:	mpb_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Tier One Risk Based Common Equity Capital Required To Be Well Capitalized.

+ References

No definition available.

+ Details

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

- Definition

Tier One Risk Based Common Equity Capital Required To Be Well Capitalized To Risk Weighted Assets.

+ References

No definition available.

+ Details

Name:	mpb_TierOneRiskBasedCommonEquityCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Namespace Prefix:	mpb_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Tier One Risk Based Common Equity Capital To Risk Weighted Assets.

+ References

No definition available.

+ Details

Name:	mpb_TierOneRiskBasedCommonEquityCapitalToRiskWeightedAssets
Namespace Prefix:	mpb_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of total capital as defined by regulatory framework.

+ References

+ Details

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

- Definition

Amount of minimum total risk-based capital required for capital adequacy as defined by regulatory framework.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B

+ Details

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

- Definition

Ratio of minimum total risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

+ References

+ Details

Name:	us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of minimum total risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

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

- Definition

Ratio of minimum total risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

Name:	us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Ratio of total risk-based capital to risk-weighted assets as defined by regulatory framework.

+ References

+ Details

Name:	us-gaap_CapitalToRiskWeightedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of Tier 1 leverage capital as defined by regulatory framework.

+ References

+ Details

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

- Definition

Amount of minimum Tier 1 leverage capital required for capital adequacy as defined by regulatory framework.

+ References

+ Details

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

- Definition

Ratio of minimum Tier 1 leverage capital to average assets required for capital adequacy as defined by regulatory framework.

+ References

+ Details

Name:	us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of minimum Tier 1 leverage capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

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

- Definition

Ratio of minimum Tier 1 leverage capital to average assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

Name:	us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Ratio of Tier 1 capital to average assets as defined by regulatory framework.

+ References

+ Details

Name:	us-gaap_TierOneLeverageCapitalToAverageAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of Tier 1 risk-based capital as defined by regulatory framework.

+ References

+ Details

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

- Definition

Amount of minimum Tier 1 risk-based capital required for capital adequacy as defined by regulatory framework.

+ References

+ Details

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

- Definition

Ratio of minimum Tier 1 risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

+ References

+ Details

Name:	us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of minimum Tier 1 risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

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

- Definition

Ratio of minimum Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

Name:	us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Ratio of Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework.

+ References

+ Details

Name:	us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	srt_ConsolidatedEntitiesAxis=srt_ParentCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=srt_SubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: