Indebtedness - Schedule of Debt (Details) - USD ($) $ in Thousands							12 Months Ended
	Dec. 12, 2019	Jun. 26, 2019	Apr. 24, 2019	Jul. 27, 2018	May 31, 2018	Jan. 22, 2018	Dec. 31, 2019	Dec. 31, 2018	Aug. 28, 2018	Nov. 01, 2017	Sep. 01, 2017	Aug. 31, 2017	Aug. 09, 2017
Debt Instrument [Line Items]
Total principal balances							$ 960,819	$ 700,722
Unamortized fair value adjustments							(878)	(1,173)
Unamortized debt issuance costs							(9,404)	(5,310)
Indebtedness, net							$ 950,537	694,239
LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate	3.17%
LIBOR | Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							1.30%
LIBOR | Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							1.85%
LIBOR | Term Loan Without Related Interest Rate Swap Agreemen | Minimum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							1.25%
LIBOR | Term Loan Without Related Interest Rate Swap Agreemen | Maximum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							1.80%
LIBOR | Term Loan With Related Interest Rate Swap | Minimum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							1.25%
LIBOR | Term Loan With Related Interest Rate Swap | Maximum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							1.80%
Lightfoot Marketplace
Debt Instrument [Line Items]
Total principal balances										$ 10,500
Southgate Square | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate					1.60%
Thames Street Wharf | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate		1.30%
Thames Street Wharf | LIBOR | Revolving Credit Facility
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate		2.25%
Hanbury Village
Debt Instrument [Line Items]
Stated interest rate													3.78%
1405 Point | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate			2.25%
Sandbridge Commons | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate						1.75%
Johns Hopkins Village | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				1.25%
The Cosmopolitan
Debt Instrument [Line Items]
Stated interest rate											3.35%	3.75%
Secured Debt
Debt Instrument [Line Items]
Total principal balances							$ 645,819	394,722
Secured Debt | North Point Center | Notes 1
Debt Instrument [Line Items]
Total principal balances							$ 0	9,352
Stated interest rate							6.45%
Secured Debt | North Point Center | Notes 2
Debt Instrument [Line Items]
Total principal balances							$ 2,214	2,346
Stated interest rate							7.25%
Secured Debt | Lightfoot Marketplace | Notes 2
Debt Instrument [Line Items]
Total principal balances							$ 0	10,500
Secured Debt | Lightfoot Marketplace | Notes 2 | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							1.75%
Secured Debt | Hoffler Place
Debt Instrument [Line Items]
Total principal balances							$ 29,059	11,445
Secured Debt | Hoffler Place | Notes 1 | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							3.24%
Secured Debt | Summit Place
Debt Instrument [Line Items]
Total principal balances							$ 28,824	11,057
Secured Debt | Summit Place | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							3.24%
Secured Debt | Southgate Square
Debt Instrument [Line Items]
Total principal balances							$ 20,562	21,442
Secured Debt | Southgate Square | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							1.60%
Secured Debt | Encore Apartments
Debt Instrument [Line Items]
Total principal balances							$ 24,842	24,966
Stated interest rate							3.25%
Secured Debt | 4525 Main Street
Debt Instrument [Line Items]
Total principal balances							$ 31,876	32,034
Stated interest rate							3.25%
Secured Debt | Red Mill West
Debt Instrument [Line Items]
Total principal balances							$ 11,296	0
Stated interest rate							4.23%
Secured Debt | Thames Street Wharf
Debt Instrument [Line Items]
Total principal balances							$ 70,000	0
Secured Debt | Thames Street Wharf | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							1.30%
Secured Debt | Hanbury Village
Debt Instrument [Line Items]
Total principal balances							$ 18,515	19,019
Stated interest rate							3.78%
Secured Debt | Marketplace at Hilltop
Debt Instrument [Line Items]
Total principal balances							$ 10,517	0
Stated interest rate							4.42%
Secured Debt | 1405 Point
Debt Instrument [Line Items]
Total principal balances							$ 53,000	0
Secured Debt | 1405 Point | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							2.25%
Secured Debt | Socastee Commons
Debt Instrument [Line Items]
Total principal balances							$ 4,567	4,671
Stated interest rate							4.57%
Secured Debt | Sandbridge Commons
Debt Instrument [Line Items]
Total principal balances							$ 8,020	8,258
Secured Debt | Sandbridge Commons | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							1.75%
Secured Debt | Wills Wharf
Debt Instrument [Line Items]
Total principal balances							$ 29,154	0
Secured Debt | Wills Wharf | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							2.25%
Secured Debt | 249 Central Park Retail
Debt Instrument [Line Items]
Total principal balances							$ 16,828	17,045
Secured Debt | 249 Central Park Retail | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							1.60%
Secured Debt | Fountain Plaza Retail
Debt Instrument [Line Items]
Total principal balances							$ 10,127	10,257
Secured Debt | Fountain Plaza Retail | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							1.60%
Secured Debt | South Retail
Debt Instrument [Line Items]
Total principal balances							$ 7,388	7,483
Secured Debt | South Retail | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							1.60%
Secured Debt | One City Center
Debt Instrument [Line Items]
Total principal balances							$ 25,286	0
Secured Debt | One City Center | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							1.85%
Secured Debt | Red Mill Central
Debt Instrument [Line Items]
Total principal balances							$ 2,538	0
Stated interest rate							4.80%
Secured Debt | Premier Apartments
Debt Instrument [Line Items]
Total principal balances							$ 16,750	12,873
Secured Debt | Premier Apartments | Notes 2 | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							1.55%
Secured Debt | Premier Retail
Debt Instrument [Line Items]
Total principal balances							$ 8,250	6,341
Secured Debt | Premier Retail | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							1.55%
Secured Debt | Red Mill South
Debt Instrument [Line Items]
Total principal balances							$ 6,137	0
Stated interest rate							3.57%
Secured Debt | Brooks Crossing Office
Debt Instrument [Line Items]
Total principal balances							$ 14,411	6,910
Secured Debt | Brooks Crossing Office | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							1.60%
Secured Debt | Market at Mill Creek
Debt Instrument [Line Items]
Total principal balances							$ 14,727	7,283
Secured Debt | Market at Mill Creek | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							1.55%
Secured Debt | Johns Hopkins Village
Debt Instrument [Line Items]
Total principal balances							$ 51,800	52,708
Secured Debt | Johns Hopkins Village | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							1.25%
Secured Debt | Lexington Square
Debt Instrument [Line Items]
Total principal balances							$ 14,696	14,940
Stated interest rate							4.50%		4.50%
Secured Debt | Red Mill North
Debt Instrument [Line Items]
Total principal balances							$ 4,394	0
Stated interest rate							4.73%
Secured Debt | Greenside (Harding Place)
Debt Instrument [Line Items]
Total principal balances							$ 34,000	25,902
Stated interest rate							3.17%
Secured Debt | Smith’s Landing
Debt Instrument [Line Items]
Total principal balances							$ 18,174	18,985
Stated interest rate							4.05%
Secured Debt | Liberty Apartments
Debt Instrument [Line Items]
Total principal balances							$ 14,165	14,437
Stated interest rate							5.66%
Secured Debt | The Cosmopolitan
Debt Instrument [Line Items]
Total principal balances							$ 43,702	44,468
Stated interest rate							3.35%
Unsecured Debt
Debt Instrument [Line Items]
Total principal balances							$ 315,000	306,000
Unsecured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Total principal balances							110,000	126,000
Unsecured Debt | Term Loan Without Related Interest Rate Swap Agreemen
Debt Instrument [Line Items]
Total principal balances							44,500	80,000
Unsecured Debt | Term Loan With Related Interest Rate Swap
Debt Instrument [Line Items]
Total principal balances							$ 160,500	$ 100,000