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Document and Entity Information
Feb. 19, 2021
Document And Entity Information [Line Items]  
Entity Registrant Name MID AMERICA APARTMENT COMMUNITIES INC.
Amendment Flag false
Entity Central Index Key 0000912595
Document Type 8-K
Document Period End Date Feb. 19, 2021
Entity Incorporation State Country Code TN
Entity File Number 001-12762
Entity Tax Identification Number 62-1543819
Entity Address, Address Line One 6815 Poplar Avenue
Entity Address, Address Line Two Suite 500
Entity Address, City or Town Germantown
Entity Address, State or Province TN
Entity Address, Postal Zip Code 38138
City Area Code (901)
Local Phone Number 682-6600
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common Stock, par value $.01 per share
Trading Symbol MAA
Security Exchange Name NYSE
M 8.50 Series I Cumulative Redeemable Preferred Stock .01 Par Value Per Share [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 8.50% Series I Cumulative Redeemable Preferred Stock, $.01 par value per share
Trading Symbol MAA*I
Security Exchange Name NYSE