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Fair Value Measurements (Loss) Gain On Assets and Liabilities Measured On A Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Financial Instrument [Line Items] |  |  |
(Loss) Gain On Assets and Liabilities Measured On A Recurring Basis | $ 2,445 mho_GainLossOnAssetsAndLiabilitiesMeasuredOnRecurringBasis | $ (1,440)mho_GainLossOnAssetsAndLiabilitiesMeasuredOnRecurringBasis | $ (1,000)mho_GainLossOnAssetsAndLiabilitiesMeasuredOnRecurringBasis
Mortgage Loans Held for Sale [Member] |  |  |
Financial Instrument [Line Items] |  |  |
(Loss) Gain On Assets and Liabilities Measured On A Recurring Basis | 3,191 mho_GainLossOnAssetsAndLiabilitiesMeasuredOnRecurringBasis / us-gaap_DerivativeByNatureAxis = mho_MortgageLoansHeldForSaleMember | (2,094)mho_GainLossOnAssetsAndLiabilitiesMeasuredOnRecurringBasis / us-gaap_DerivativeByNatureAxis = mho_MortgageLoansHeldForSaleMember | (1,494)mho_GainLossOnAssetsAndLiabilitiesMeasuredOnRecurringBasis / us-gaap_DerivativeByNatureAxis = mho_MortgageLoansHeldForSaleMember
Forward Sales or Mortgage Backed Securities [Member] |  |  |
Financial Instrument [Line Items] |  |  |
(Loss) Gain On Assets and Liabilities Measured On A Recurring Basis | (927)mho_GainLossOnAssetsAndLiabilitiesMeasuredOnRecurringBasis / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | 492 mho_GainLossOnAssetsAndLiabilitiesMeasuredOnRecurringBasis / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | 723 mho_GainLossOnAssetsAndLiabilitiesMeasuredOnRecurringBasis / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember
Interest Rate Lock Commitments [Member] |  |  |
Financial Instrument [Line Items] |  |  |
(Loss) Gain On Assets and Liabilities Measured On A Recurring Basis | 607 mho_GainLossOnAssetsAndLiabilitiesMeasuredOnRecurringBasis / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateLockCommitmentsMember | (320)mho_GainLossOnAssetsAndLiabilitiesMeasuredOnRecurringBasis / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateLockCommitmentsMember | (357)mho_GainLossOnAssetsAndLiabilitiesMeasuredOnRecurringBasis / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateLockCommitmentsMember
Best Efforts Contracts [Member] |  |  |
Financial Instrument [Line Items] |  |  |
(Loss) Gain On Assets and Liabilities Measured On A Recurring Basis | $ (426)mho_GainLossOnAssetsAndLiabilitiesMeasuredOnRecurringBasis / us-gaap_DerivativeByNatureAxis = us-gaap_LoanPurchaseCommitmentsMember | $ 482 mho_GainLossOnAssetsAndLiabilitiesMeasuredOnRecurringBasis / us-gaap_DerivativeByNatureAxis = us-gaap_LoanPurchaseCommitmentsMember | $ 128 mho_GainLossOnAssetsAndLiabilitiesMeasuredOnRecurringBasis / us-gaap_DerivativeByNatureAxis = us-gaap_LoanPurchaseCommitmentsMember

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- Definition The amount of gain (loss) recognized in financial services revenue during the period. + References No definition available. + Details
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