Mortgage Notes Receivable - Schedule of carrying value of collateral dependent loans (Details) - USD ($) $ in Thousands		Mar. 31, 2022		Dec. 31, 2021		Mar. 31, 2021	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Carrying Value		$ 940,078		$ 911,744
CECL Allowance		(8,647)	[1]	(10,394)	[2]	$ (10,663)	$ (10,590)
Financing Receivable, after Allowance for Credit Loss, Total		931,431		901,350
Allowances on excess amortized cost over fair value				700
Loan portfolio [Member]
Loans and Leases Receivable Disclosure [Line Items]
Carrying Value		58,684		45,772
CECL Allowance		(2,094)	[3]	(1,834)	[4]
Financing Receivable, after Allowance for Credit Loss, Total		56,590		43,938
Allowances on excess amortized cost over fair value		900		700
Fair value allowances		1,200
Senior Housing [Member]
Loans and Leases Receivable Disclosure [Line Items]
Carrying Value		64,119		61,236
Senior Housing [Member] | Loan portfolio [Member]
Loans and Leases Receivable Disclosure [Line Items]
Carrying Value		51,331		25,337
CECL Allowance		(1,117)	[3]	(1,103)	[4]
Financing Receivable, after Allowance for Credit Loss, Total		50,214		24,234
Apartments
Loans and Leases Receivable Disclosure [Line Items]
Carrying Value		115,043		107,765
Apartments | Loan portfolio [Member]
Loans and Leases Receivable Disclosure [Line Items]
Carrying Value		5,101
CECL Allowance	[3]	(57)
Financing Receivable, after Allowance for Credit Loss, Total		5,044
Entitled Land [Member]
Loans and Leases Receivable Disclosure [Line Items]
Carrying Value		47,117		45,098
Entitled Land [Member] | Loan portfolio [Member]
Loans and Leases Receivable Disclosure [Line Items]
Carrying Value				17,335
CECL Allowance	[4]			(42)
Financing Receivable, after Allowance for Credit Loss, Total				17,293
Single Family Housing [Member] | Loan portfolio [Member]
Loans and Leases Receivable Disclosure [Line Items]
Carrying Value		742		1,730
CECL Allowance		(7)	[3]	(15)	[4]
Financing Receivable, after Allowance for Credit Loss, Total		735		1,715
Condos [Member]
Loans and Leases Receivable Disclosure [Line Items]
Carrying Value		68,059		64,492
Condos [Member] | Loan portfolio [Member]
Loans and Leases Receivable Disclosure [Line Items]
Carrying Value		1,247		1,109
CECL Allowance		(912)	[3]	(673)	[4]
Financing Receivable, after Allowance for Credit Loss, Total		335		436
Townhomes [Member]
Loans and Leases Receivable Disclosure [Line Items]
Carrying Value		84,810		93,300
Townhomes [Member] | Loan portfolio [Member]
Loans and Leases Receivable Disclosure [Line Items]
Carrying Value		263		261
CECL Allowance		(1)	[3]	(1)	[4]
Financing Receivable, after Allowance for Credit Loss, Total		262		260
Residential Lots [Member]
Loans and Leases Receivable Disclosure [Line Items]
Carrying Value		$ 110,316		$ 111,644

[1] Includes $0.9 million in loan specific allowances for loans deemed collateral dependent based on the excess amortized cost over the fair value of the underlying collateral. In addition, $1.1 million of the CECL allowance is excluded from this table because it relates to unfunded commitments and has been recorded as a liability under accounts payable and accrued liabilities in our condensed consolidated balance sheet.

[2] Includes $0.7 million in loan specific allowances for loans deemed collateral dependent based on the excess amortized cost over the fair value of the underlying collateral.

[3] Includes $0.9 million in loan specific allowances for loans deemed collateral dependent based on the excess amortized cost over the fair value of the underlying collateral and $1.2 million where the fair value was greater than the amortized cost and the allowance is based on the standard CECL methodology.

[4] Includes $0.7 million in loan specific allowances for loans deemed collateral dependent based on the excess amortized cost over the fair value of the underlying collateral and $1.1 million where the fair value was greater than the amortized cost and the allowance is based on the standard CECL methodology.