Loans Receivable - Internal Ratings for Loans Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, net	$ 62,998	$ 313,326
Percentage of Loan Portfolio	100.00%
Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, net	$ 62,998
Watch List Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, net	0
Workout DFLs
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, net	0
Real Estate Secured
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, net	$ 42,037	188,418
Percentage of Loan Portfolio	67.00%
Real Estate Secured | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, net	$ 42,037
Real Estate Secured | Watch List Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, net	0
Real Estate Secured | Workout DFLs
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, net	0
Other Secured
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, net	$ 20,961	$ 124,908
Percentage of Loan Portfolio	33.00%
Other Secured | Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, net	$ 20,961
Other Secured | Watch List Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, net	0
Other Secured | Workout DFLs
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, net	$ 0