Variable Interest Entity Disclosure (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Total assets	$ 1,010,233	$ 1,030,775
Total equity	525,317	544,840
Total liabilities and equity	1,010,233	1,030,775
Net real property owned
Variable Interest Entity [Line Items]
Total assets	977,252	1,002,137
Cash and cash equivalents
Variable Interest Entity [Line Items]
Total assets	15,059	12,308
Receivables and other assets
Variable Interest Entity [Line Items]
Total assets	17,922	16,330
Secured Debt
Variable Interest Entity [Line Items]
Liabilities	466,772	471,103
Accrued expenses and other liabilities
Variable Interest Entity [Line Items]
Liabilities	$ 18,144	$ 14,832