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Guarantees and Indemnifications Guarantees (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Guarantees [Abstract] |  |
Total of Loans Covered by Guarantees | $ 48,100 | $ 63,600
Total of Guaranteed Loans Inquired About | 600 | 550
Total Loans Indemnified to third parties | 1,000 | 1,000
Loan Repurchase Guarantee Liability | 500 | 600
Guarantor Obligations, Current Carrying Value | $ 700 | $ 700

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- 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

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- 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

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- 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

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- 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

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsCurrentCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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