Transactions with Related Parties Transactions with Related Parties Narrative (Details)	3 Months Ended	12 Months Ended
	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) Property	Dec. 31, 2015 USD ($) Property	Dec. 31, 2014 USD ($)	Sep. 30, 2013 Property
Rate for administration fees		0.45%
Fees and commissions, other		$ 2,100,000	$ 1,900,000	$ 1,700,000
One-time mortgage negotiated placement fees	$ 125,000
Additional fees and commissions paid			300,000
Management fees revenue		1,100,000	1,200,000	1,300,000
Placement advisory fees		0	150,000	300,000
Outstanding liabilities due to related parties		$ 415,000	$ 241,000
Number of Variable Interest Entities | Property		20	15
Majority-Owned Subsidiary, Unconsolidated [Member]
Payment for administrative fees		$ 2,800,000	$ 2,600,000	2,000,000
Variable Interest Entity Primary Beneficiary [Member] | Total Owners [Member]
Number of Variable Interest Entities | Property					2
Affiliated Entity [Member]
Payment for administrative fees		95,000	53,000	138,000
Farnam Capital Advisors, LLC [Member]
Placement advisory fees		1,000,000	1,800,000	$ 1,400,000
Origination fees	$ 125,000
Farnam Capital Advisors, LLC [Member] | Term A/B Trust [Member]
Consulting fees		$ 1,200,000
Bent Tree [Member] | Affiliated Entity [Member]
Payment for administrative fees			$ 635,000