Loans Receivable and Other Lending Investments, net (Credit Characteristics by Payment Status) (Details) - Commercial Portfolio Segment - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Recorded investment in loans, aged by payment status and presented by class
Total	$ 213,488	$ 212,683
Past Due
Recorded investment in loans, aged by payment status and presented by class
Total	59,642	59,640
Greater Than 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total	59,642	59,640
Less Than and Equal to 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total	0	0
Current
Recorded investment in loans, aged by payment status and presented by class
Total	153,846	153,043
Senior mortgages
Recorded investment in loans, aged by payment status and presented by class
Total	200,818	199,608
Senior mortgages | Past Due
Recorded investment in loans, aged by payment status and presented by class
Total	59,642	59,640
Senior mortgages | Greater Than 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total	59,642	59,640
Senior mortgages | Less Than and Equal to 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total	0	0
Senior mortgages | Current
Recorded investment in loans, aged by payment status and presented by class
Total	141,176	139,968
Corporate/Partnership loans
Recorded investment in loans, aged by payment status and presented by class
Total		618
Corporate/Partnership loans | Past Due
Recorded investment in loans, aged by payment status and presented by class
Total		0
Corporate/Partnership loans | Greater Than 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total		0
Corporate/Partnership loans | Less Than and Equal to 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total		0
Corporate/Partnership loans | Current
Recorded investment in loans, aged by payment status and presented by class
Total		618
Subordinate mortgages
Recorded investment in loans, aged by payment status and presented by class
Total	12,670	12,457
Subordinate mortgages | Past Due
Recorded investment in loans, aged by payment status and presented by class
Total	0	0
Subordinate mortgages | Greater Than 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total	0	0
Subordinate mortgages | Less Than and Equal to 90 Days
Recorded investment in loans, aged by payment status and presented by class
Total	0	0
Subordinate mortgages | Current
Recorded investment in loans, aged by payment status and presented by class
Total	$ 12,670	$ 12,457