Fair Value Measurements Fair Value of Financial Instrument Assumptions (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value of Financial Instrument Assumptions [Line Items]
Split dollar life insurance policy change	$ (539)
Letters of Credit Potential Commitments, Amount	25,833	25,668
New Unsecured Credit Facility [Member] [Member]
Fair Value of Financial Instrument Assumptions [Line Items]
Line of Credit Facility, Current Borrowing Capacity	200,000
Warehousing Agreement - Amended and Restated [Member]
Fair Value of Financial Instrument Assumptions [Line Items]
M/I Financial Maximum Borrowing Capacity	100,000
Optional increase in borrowing availability for MIF	20,000
Repurchase Agreement [Member]
Fair Value of Financial Instrument Assumptions [Line Items]
M/I Financial Maximum Borrowing Capacity	$ 15,000