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Leases - Addititonal Information (Details)	9 Months Ended
	Sep. 30, 2021 USD ($)
Lease Cost [Abstract]
Sub lease agreement additional extended period	1 year
Sale and leaseback transactions	$ 0
Leveraged leases	$ 0

X

- Definition

Lessee lease sale and lease back transaction.

+ References

No definition available.

+ Details

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Namespace Prefix:	mpb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Sub lease agreement additional extended period.

+ References

No definition available.

+ Details

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X

- References

No definition available.

+ Details

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X

- Definition

Carrying amount as of the balance sheet date of leveraged lease investments which represent the aggregate amount of the estimated residual value of the lease assets and lease payments receivables, net of unearned and deferred income to be allocated over the lease term and non-recourse debt.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant