Related Party Transactions (Schedule of Related Party Transactions) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Income from related parties	$ 1,569	$ 1,444
ECCU [Member] \| Funds Held With Related Party [Member]
Related Party Transaction [Line Items]
Interest earned on funds held with related party		3
ECCU [Member] \| Loans Purchased [Member]
Related Party Transaction [Line Items]
Income from related parties	161	278
ECCU [Member] \| Networking Agreement [Member]
Related Party Transaction [Line Items]
Related party expenses/fees paid	9	25
ECCU [Member] \| Master Services Agreement [Member]
Related Party Transaction [Line Items]
Income from related parties	14	54
ECCU [Member] \| Successor Servicing Agreement [Member]
Related Party Transaction [Line Items]
Income from related parties	9	9
ECCU [Member] \| Rent Expense [Member]
Related Party Transaction [Line Items]
Related party expenses/fees paid	138	116
ACCU [Member]
Related Party Transaction [Line Items]
Dollar amount of loans purchased	1,435
Dollar amount of loans sold to related party		554
Income from related parties		20
ACCU [Member] \| Funds Held With Related Party [Member]
Related Party Transaction [Line Items]
Interest earned on funds held with related party	159	69
ACCU [Member] \| Loans Purchased [Member]
Related Party Transaction [Line Items]
Income from related parties	84	86
ACCU [Member] \| Networking Agreement [Member]
Related Party Transaction [Line Items]
Related party expenses/fees paid	$ 45	$ 56

Related Party Mortgage Loans Purchased

No definition available.

Name:	mnpt_RelatedPartyMortgageLoansPurchased
Namespace Prefix:	mnpt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Related Party Mortgage Loans Sold

+ References

No definition available.

+ Details

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Namespace Prefix:	mnpt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of interest income earned from interest-bearing assets owed to the entity by related party.

+ References

No definition available.

+ Details

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

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

No definition available.

+ Details

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

+ Details

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Period Type:	duration

- Details

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- Details

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- Details

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- Details

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- Details

Name:	us-gaap_RelatedPartyTransactionAxis=mnpt_MasterServicesAgreementMember
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- Details

Name:	us-gaap_RelatedPartyTransactionAxis=mnpt_SuccessorServicingAgreementMember
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- Details

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- Details

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