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Investment in Unconsolidated Entities - Narrative (Details)	3 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($) derivative_instrument	May 07, 2021 USD ($)	Dec. 31, 2020 USD ($)
Interest Rate Swap
Variable Interest Entity [Line Items]
Derivative liability	$ 94,000
Antoine Town Center | Subsequent Event
Variable Interest Entity [Line Items]
Deferred gain on sale of property			$ 54,000
IAGM Retail Fund I, LLC
Variable Interest Entity [Line Items]
Gain on sale		$ 1,741,000
Deferred gain on sale of property		$ 958,000
Equity investment basis adjustment, amortization period (in years)		30 years
Repayment of mortgage note payable on one retail property	23,150,000	$ 14,872,000
IAGM Retail Fund I, LLC | Interest Rate Swap
Variable Interest Entity [Line Items]
Number of derivatives held | derivative_instrument		2
Derivative liability	$ 171,000
IAGM Retail Fund I, LLC | Interest Rate Swap, Effective Date April 1, 2020, 1.979% Fixed Interest
Variable Interest Entity [Line Items]
Notional amount		$ 45,000,000
Fixed interest rate		1.979%
IAGM Retail Fund I, LLC | Interest Rate Swap, Effective Date April 1, 2020, 1.956% Fixed Interest
Variable Interest Entity [Line Items]
Notional amount		$ 30,000,000
Fixed interest rate		1.956%
Retail
Variable Interest Entity [Line Items]
Purchase price		$ 33,204,000
Retail | Antoine Town Center
Variable Interest Entity [Line Items]
Purchase price		$ 22,254,000
IAGM Retail Fund I, LLC
Variable Interest Entity [Line Items]
Ownership percentage	55.00%			55.00%
Investment in unconsolidated entities	$ 106,566,000			$ 109,051,000

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