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Guarantees and Indemnifications Guarantees (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Guarantees [Abstract] |  |
Total of Loans Covered by Guarantees | $ 46,774 | $ 27,647
Total of Guaranteed Loans Inquired About | 1,170 | 940
Total Loans Indemnified to third parties | 1,304 | 1,604
Loan Repurchase Guarantee Liability | $ 810 | $ 905

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