Organization (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) investment apartment project building community shares	Dec. 31, 2020 USD ($) community shares
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Limited partner - ownership percentage	3.40%	3.40%
Operating Partnership units outstanding (in shares) | shares	2,282,464	2,294,760
Redemption value of operating partnership units outstanding | $	$ 804.0	$ 544.8
Number of apartment communities owned | community	252	2
Number of apartment units owned | apartment	61,911
Ownership interests, number of commercial buildings | building	3
Ownership interests, number of consolidated projects | project	1
Ownership Interests, number of unconsolidated projects | investment	1
Operating Partnership
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
General partner ownership interest	96.60%	96.60%