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Guarantees and Indemnifications Guarantees (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Guarantees [Abstract] |  |
Total of Loans Covered by Guarantees | $ 81,900 | $ 46,800
Total of Guaranteed Loans Inquired About | 600 | 1,200
Total Loans Indemnified to third parties | 1,000 | 1,300
Loan Repurchase Guarantee Liability | $ 600 | $ 800

X
- Definition Maximum potential amount of future payments the guarantor could be required to make under the Company's subsidiary loan repurchase guarantees. + References No definition available. + Details
Name: | mho_LoanRepurchaseGuaranteeLiability
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The total of all loans indemnified to third party insurers relating to certain repurchase agreements. + References No definition available. + Details
Name: | mho_TotalLoansIndemnified
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total of loans covered by the guarantees discussed for which inquiries were made by the purchasers of the loans. + References No definition available. + Details
Name: | mho_TotalOfGuaranteedLoansInquiredAbout
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The total amount of loans covered by guarantees that said loans could potentially be repurchased in the case certain conditions occur. + References No definition available. + Details
Name: | mho_TotalOfLoansCoveredByGuarantees
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_GuaranteesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration