Indebtedness - Schedule of Debt (Details) - USD ($) $ in Thousands									12 Months Ended
	Dec. 22, 2020	Sep. 22, 2020	Dec. 12, 2019	Jun. 26, 2019	Apr. 24, 2019	Jul. 27, 2018	May 31, 2018	Jan. 22, 2018	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019	Aug. 28, 2018
Debt Instrument [Line Items]
Total principal balances									$ 962,812		$ 960,819
Unamortized GAAP adjustments									(8,971)		(10,282)
Other note payable									10,004		0
Indebtedness, net									$ 963,845		950,537
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%
Hoffler Place | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate	2.60%
Summit Place | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate	2.60%
Southgate Square | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate							1.60%
Nexton Square | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate		2.25%
Thames Street Wharf | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				1.30%
1405 Point
Debt Instrument [Line Items]
Remaining lease term									42 years	42 years
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%
Wills Wharf | LIBOR | Revolving Credit Facility
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate				2.25%
Johns Hopkins Village | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate						1.25%
Secured Debt
Debt Instrument [Line Items]
Total principal balances									$ 747,812		645,819
Secured Debt | Sandbridge Commons (2) | 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									$ 18,400		29,059
Secured Debt | Hoffler Place | Notes 1 | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate									2.60%
Secured Debt | Summit Place
Debt Instrument [Line Items]
Total principal balances									$ 23,100		28,824
Secured Debt | Summit Place | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate									2.60%
Secured Debt | Hanbury Village
Debt Instrument [Line Items]
Total principal balances									$ 0		18,515
Stated interest rate									3.78%
Secured Debt | Southgate Square
Debt Instrument [Line Items]
Total principal balances									$ 19,682		20,562
Secured Debt | Southgate Square | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate									1.60%
Secured Debt | Nexton Square
Debt Instrument [Line Items]
Total principal balances									$ 22,909		0
Secured Debt | Nexton Square | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate									2.25%
Secured Debt | Encore Apartments
Debt Instrument [Line Items]
Total principal balances									$ 24,337		24,842
Stated interest rate									3.25%
Secured Debt | 4525 Main Street
Debt Instrument [Line Items]
Total principal balances									$ 31,231		31,876
Stated interest rate									3.25%
Secured Debt | Red Mill West
Debt Instrument [Line Items]
Total principal balances									$ 10,851		11,296
Stated interest rate									4.23%
Secured Debt | Thames Street Wharf
Debt Instrument [Line Items]
Total principal balances									$ 70,000		70,000
Secured Debt | Thames Street Wharf | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate									1.30%
Secured Debt | Marketplace at Hilltop
Debt Instrument [Line Items]
Total principal balances									$ 10,120		10,517
Stated interest rate									4.42%
Secured Debt | 1405 Point
Debt Instrument [Line Items]
Total principal balances									$ 53,000		53,000
Secured Debt | 1405 Point | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate									2.25%
Secured Debt | Sandbridge Commons | Notes 2
Debt Instrument [Line Items]
Total principal balances									$ 0		8,020
Secured Debt | Socastee Commons
Debt Instrument [Line Items]
Total principal balances									$ 4,458		4,567
Stated interest rate									4.57%
Secured Debt | Wills Wharf
Debt Instrument [Line Items]
Total principal balances									$ 59,044		29,154
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									$ 16,597		16,828
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									$ 9,988		10,127
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									$ 7,287		7,388
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									$ 24,712		25,286
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									$ 2,363		2,538
Stated interest rate									4.80%
Secured Debt | Solis Gainesville
Debt Instrument [Line Items]
Total principal balances									$ 0		0
Secured Debt | Solis Gainesville | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate									3.00%
Secured Debt | Premier Apartments
Debt Instrument [Line Items]
Total principal balances									$ 16,716		16,750
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									$ 8,241		8,250
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									$ 5,833		6,137
Stated interest rate									3.57%
Secured Debt | Brooks Crossing Office
Debt Instrument [Line Items]
Total principal balances									$ 15,393		14,411
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									$ 13,789		14,727
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									$ 50,859		51,800
Secured Debt | Johns Hopkins Village | LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate									1.25%
Secured Debt | North Point Center | Notes 2
Debt Instrument [Line Items]
Total principal balances									$ 2,094		2,214
Stated interest rate									7.25%
Secured Debt | Lexington Square
Debt Instrument [Line Items]
Total principal balances									$ 14,440		14,696
Stated interest rate									4.50%			4.50%
Secured Debt | Red Mill North
Debt Instrument [Line Items]
Total principal balances									$ 4,294		4,394
Stated interest rate									4.73%
Secured Debt | Greenside Apartments
Debt Instrument [Line Items]
Total principal balances									$ 33,310		34,000
Stated interest rate									3.17%
Secured Debt | The Residences at Annapolis Junction
Debt Instrument [Line Items]
Total principal balances									$ 84,375		0
Secured Debt | The Residences at Annapolis Junction | SOFR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate									2.66%
Secured Debt | Smith’s Landing
Debt Instrument [Line Items]
Total principal balances									$ 17,331		18,174
Stated interest rate									4.05%
Secured Debt | Liberty Apartments
Debt Instrument [Line Items]
Total principal balances									$ 13,877		14,165
Stated interest rate									5.66%
Secured Debt | Edison Apartments
Debt Instrument [Line Items]
Total principal balances									$ 16,272		0
Stated interest rate									5.30%
Secured Debt | The Cosmopolitan
Debt Instrument [Line Items]
Total principal balances									$ 42,909		43,702
Stated interest rate									3.35%
Unsecured Debt
Debt Instrument [Line Items]
Total principal balances									$ 215,000		315,000
Unsecured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Total principal balances									10,000		110,000
Unsecured Debt | Term Loan Without Related Interest Rate Swap Agreemen
Debt Instrument [Line Items]
Total principal balances									19,500		44,500
Unsecured Debt | Term Loan With Related Interest Rate Swap
Debt Instrument [Line Items]
Total principal balances									$ 185,500		$ 160,500