Regulatory Matters - Regulatory Capital Levels And Related Ratios (Details) $ in Thousands	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
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)	$ 410,494	$ 374,368
Common Equity Tier 1 Capital (to Risk Weighted Assets)	410,494	365,084
Tier 1 Capital (to Risk Weighted Assets)	410,494	374,368
Total Capital (to Risk Weighted Assets)	$ 484,477	$ 452,527
Actual, Ratio
Tier 1 Capital (to Average Assets)	0.096	0.081
Common Equity Tier 1 Capital (to Risk Weighted Assets)	11.20%	11.70%
Tier 1 Capital (to Risk Weighted Assets)	0.112	0.120
Total Capital (to Risk Weighted Assets)	0.132	0.146
Capital Adequacy, Amount
Tier 1 Capital (to Average Assets)	$ 171,500	$ 185,764
Common Equity Tier 1 Capital (to Risk Weighted Assets)	257,130	217,579
Tier 1 Capital (to Risk Weighted Assets)	312,229	264,203
Total Capital (to Risk Weighted Assets)	$ 385,695	$ 326,369
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)	$ 463,964	$ 398,773
Common Equity Tier 1 Capital (to Risk Weighted Assets)	463,964	398,773
Tier 1 Capital (to Risk Weighted Assets)	463,964	398,773
Total Capital (to Risk Weighted Assets)	$ 483,006	$ 413,442
Actual, Ratio
Tier 1 Capital (to Average Assets)	0.108	0.086
Common Equity Tier 1 Capital (to Risk Weighted Assets)	12.60%	12.80%
Tier 1 Capital (to Risk Weighted Assets)	0.126	0.128
Total Capital (to Risk Weighted Assets)	0.132	0.133
Capital Adequacy, Amount
Tier 1 Capital (to Average Assets)	$ 171,398	$ 185,721
Common Equity Tier 1 Capital (to Risk Weighted Assets)	256,895	217,446
Tier 1 Capital (to Risk Weighted Assets)	311,943	264,041
Total Capital (to Risk Weighted Assets)	$ 385,342	$ 326,169
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
Banking Regulation, Tier 1 Leverage Capital, Well Capitalized, Minimum	$ 214,248	$ 232,151
Tier One Risk Based Common Equity Capital Required To Be Well Capitalized	238,545	201,914
Banking Regulation, Tier 1 Risk-Based Capital, Well Capitalized, Minimum	293,594	248,510
Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum	$ 366,992	$ 310,637
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 BufferTo 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1B
-URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826

+ 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1B
-URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

+ 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: