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Notes Receivable (Details Textual) (USD $) In Millions, unless otherwise specified			9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Minimum [Member]	Sep. 30, 2013 Maximum [Member]	Sep. 30, 2013 Weighted Average [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes Receivable Interest Rate Stated Percentage			2.30%	6.50%	4.30%
Notes Receivable (Textual) [Abstract]
Notes receivable secured by interests in real estate or interests in real estate partnerships	$ 216.1	$ 101.3

Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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