Name:	mmac_BondsPrepayableWithoutRestrictionOrPenaltyAmortizedCostAbstract
Namespace Prefix:	mmac_
Data Type:	xbrli:stringItemType
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The amortized cost of bonds prepayable without restriction or penalty for the current period.

No definition available.

Name:	mmac_BondsPrepayableWithoutRestrictionOrPenaltyAmortizedCostCurrent
Namespace Prefix:	mmac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amortized cost of bonds prepayable without restriction or penalty within the second fiscal year following the latest fiscal year.

No definition available.

Name:	mmac_BondsPrepayableWithoutRestrictionOrPenaltyAmortizedCostYearTwo
Namespace Prefix:	mmac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

Name:	mmac_BondsPrepayableWithoutRestrictionOrPenaltyFairValueAbstract
Namespace Prefix:	mmac_
Data Type:	xbrli:stringItemType
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The fair value of bonds prepayable without restriction or penalty for the current period.

No definition available.

Name:	mmac_BondsPrepayableWithoutRestrictionOrPenaltyFairValueCurrent
Namespace Prefix:	mmac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The fair value of bonds prepayable without restriction or penalty within the second fiscal year following the latest fiscal year.

No definition available.

Name:	mmac_BondsPrepayableWithoutRestrictionOrPenaltyFairValueYearTwo
Namespace Prefix:	mmac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Bonds, Prepayable Without Restriction Or Penalty, Unpaid Principal Balance, Current

No definition available.

Name:	mmac_BondsPrepayableWithoutRestrictionOrPenaltyUnpaidPrincipalBalanceCurrent
Namespace Prefix:	mmac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Bonds, Prepayable Without Restriction Or Penalty, Unpaid Principal Balance, Year Two

No definition available.

Name:	mmac_BondsPrepayableWithoutRestrictionOrPenaltyUnpaidPrincipalBalanceYearTwo
Namespace Prefix:	mmac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Bonds Unpaid Principal Balance [Abstract].

No definition available.

Name:	mmac_BondsUnpaidPrincipalBalanceAbstract
Namespace Prefix:	mmac_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563