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Debt MIF Warehousing Agreement (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Line of Credit Facility [Line Items] |  |
Maximum Borrowing Availability under all Credit Lines | $ 200,000 | $ 185,000
Notes payable bank - financial services operations | 168,195 | $ 152,895
Warehousing Agreement - First Amendment to Second Amended and Restated [Member] |  |
Line of Credit Facility [Line Items] |  |
M/I Financial Maximum Borrowing Capacity | 125,000 |
M/I Financial Temporary Increase Maximum Borrowing Capacity | $ 150,000 |
LIBOR basis points | 237.5 |
Debt Instrument, Basis Spread on Variable Rate | 2.75% |
Repurchase Agreement - Amendment No. 4 [Member] |  |
Line of Credit Facility [Line Items] |  |
M/I Financial Maximum Borrowing Capacity | $ 35,000 |
M/I Financial Temporary Increase Maximum Borrowing Capacity | $ 50,000 |
Minimum [Member] | Repurchase Agreement - Amendment No. 4 [Member] |  |
Line of Credit Facility [Line Items] |  |
LIBOR basis points | 250 |
Maximum [Member] | Repurchase Agreement - Amendment No. 4 [Member] |  |
Line of Credit Facility [Line Items] |  |
LIBOR basis points | 275 |

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- Definition Carrying value as of the balance sheet date of the outstanding short-term borrowings under a revolving line of credit used by mortgage bankers to finance the origination or purchase of loans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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