Loans Receivable and Allowance for Loan Losses (Schedule of Age Analysis of Past Due Loans by Class) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 4,185	$ 5,907
Current	117,940	125,142
Loans: Balance	122,125	131,049
Greater Than 90 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,185	5,907
Wholly-Owned First [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,185	5,907
Current	112,836	118,250
Loans: Balance	117,021	124,157
Wholly-Owned First [Member] | Greater Than 90 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,185	5,907
Wholly-Owned Junior [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	3,517	3,589
Loans: Balance	3,517	3,589
Participation First [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,587	3,303
Loans: Balance	$ 1,587	$ 3,303