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Joint Ventures - Unconsolidated JV - Sea Sound Apartments JV (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 31, 2020 USD ($)	Jun. 30, 2021 USD ($) item	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) item	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Investments
Outstanding debt		$ 185,957		$ 185,957		$ 161,418
Summarized financial information
Investment in real estate		601,589		601,589		551,653
Cash and cash equivalents		33,336	$ 106,039	33,336	$ 106,039	106,794
Other assets		73,001		73,001		65,866
Total assets		1,102,005		1,102,005		1,037,324
Debt, net		183,086		183,086		158,915
Other liabilities		87,514		87,514		72,035
Equity		588,515	542,650	588,515	542,650	568,170	$ 568,104	$ 520,910	$ 529,670
Total liabilities and equity		1,102,005		1,102,005		1,037,324
Revenues		72,239	36,082	113,545	54,655
Total expenses		41,489	24,975	77,256	44,874
Net income		$ 24,024	$ 19,219	$ 26,981	$ 17,884
Sea Sound Apartments JV
Investments
Value of land contributed	$ 5,100
Mitigation bank credits contributed						400
Cash contributed						4,900
Cash contributed by JV partner						$ 6,900
Ownership percentage		60.00%		60.00%		60.00%
Unconsolidated joint ventures
Investments
Outstanding debt		$ 58,295		$ 58,295		$ 33,088
Sea Sound Apartments JV
Investments
Outstanding debt		26,355		26,355		8,789
Summarized financial information
Investment in real estate		47,627		47,627		29,085
Cash and cash equivalents		52		52		15
Other assets		16		16
Total assets		47,695		47,695		29,100
Debt, net		26,043		26,043		8,378
Other liabilities		4,419		4,419		3,439
Equity		17,233		17,233		17,283
Total liabilities and equity		47,695		47,695		29,100
Revenues		21		21
Total expenses		68		71
Net income		(47)		(50)
Sea Sound Apartments JV \| Sea Sound Apartments JV Loan
Investments
Loan amount	$ 40,300
Outstanding debt		$ 26,400		$ 26,400		$ 8,800
Sea Sound Apartments JV \| LIBOR \| Sea Sound Apartments JV Loan
Investments
Basis spread on variable rate (as a percent)	2.15%
Sea Sound Apartments JV \| Apartment
Investments
Number of units to be developed \| item		300		300