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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 | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Financial Instrument [Line Items] |  |
(Loss) Gain On Assets and Liabilities Measured On A Recurring Basis | $ 164 mho_GainLossOnAssetsAndLiabilitiesMeasuredOnRecurringBasis | $ 2,531 mho_GainLossOnAssetsAndLiabilitiesMeasuredOnRecurringBasis
Mortgage Loans Held for Sale [Member] |  |
Financial Instrument [Line Items] |  |
(Loss) Gain On Assets and Liabilities Measured On A Recurring Basis | 358 mho_GainLossOnAssetsAndLiabilitiesMeasuredOnRecurringBasis / us-gaap_DerivativeByNatureAxis = mho_MortgageLoansHeldForSaleMember | 2,788 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 | (380)mho_GainLossOnAssetsAndLiabilitiesMeasuredOnRecurringBasis / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | (565)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 | 345 mho_GainLossOnAssetsAndLiabilitiesMeasuredOnRecurringBasis / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateLockCommitmentsMember | 721 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 | $ (159)mho_GainLossOnAssetsAndLiabilitiesMeasuredOnRecurringBasis / us-gaap_DerivativeByNatureAxis = us-gaap_LoanPurchaseCommitmentsMember | $ (413)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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