Loans Receivable - Schedule of Loans Receivable Internal Ratings (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Percentage of Loan Portfolio	100.00%
Loans receivable, net	$ 41,302	$ 313,326
Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, net	41,302
Watch List Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, net	0
Workout Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, net	$ 0
Real Estate Secured
Financing Receivable, Recorded Investment [Line Items]
Percentage of Loan Portfolio	48.00%
Loans receivable, net	$ 19,792	188,418
Real Estate Secured | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, net	19,792
Real Estate Secured | Watch List Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, net	0
Real Estate Secured | Workout Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, net	$ 0
Other Secured
Financing Receivable, Recorded Investment [Line Items]
Percentage of Loan Portfolio	52.00%
Loans receivable, net	$ 21,510	$ 124,908
Other Secured | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, net	21,510
Other Secured | Watch List Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, net	0
Other Secured | Workout Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, net	$ 0