Loans Held for Investment (Narrative) (Details) $ in Thousands		3 Months Ended	6 Months Ended
		Jun. 30, 2015 USD ($) loan	Jun. 30, 2015 USD ($) loan	Jun. 30, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment | loan		12	12
Weighted-average interest rate	[1]	6.10%	6.10%
Weighted-average years to maturity	[2]		9 years 6 months
Principal repayments received from borrowers			$ 5,028	$ 4,155
Mortgage Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal repayments received from borrowers		$ 200	$ 200
Real Estate Investment Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment | loan		12	12

[1] The interest rates on the loans secured by real estate range from a zero coupon rate to 7.24%, as of June 30, 2015.

[2] The mortgage notes receivable have maturity dates ranging from September 1, 2015 to January 1, 2033.