Loans Receivable and Allowance for Loan Losses (Schedule of Loan Portfolio Credit Quality Indicators by Class) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 122,125	$ 131,049
Wholly-Owned First [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	117,021	124,157
Wholly-Owned Junior [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	3,517	3,589
Participation First [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,587	3,303
Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	98,522	102,113
Pass [Member] | Wholly-Owned First [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	93,636	96,674
Pass [Member] | Wholly-Owned Junior [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	3,486	3,557
Pass [Member] | Participation First [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,400	1,882
Watch [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	17,422	20,093
Watch [Member] | Wholly-Owned First [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	17,204	19,870
Watch [Member] | Wholly-Owned Junior [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	31	32
Watch [Member] | Participation First [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	187	191
Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	5,677	8,333
Substandard [Member] | Wholly-Owned First [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	5,677	7,103
Substandard [Member] | Participation First [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		1,230
Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	504	510
Doubtful [Member] | Wholly-Owned First [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 504	$ 510