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Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Amortization of in-place leases $ 9,100 $ 10,400 $ 9,400  
Amortization of Below Market Lease   100 200  
Capitalized interest 17,400 14,100 13,600  
Capitalized real estate taxes 3,300 2,800 2,200  
Property revenues 10,800 8,696 7,231  
Proceeds from Collection of Notes Receivable 1,400      
Proceeds from Interest Received 600      
Outstanding notes receivable $ 6,423 $ 7,868 $ 9,314 $ 18,790
Weighted average interest rate on outstanding notes receivable 7.00%      
Percentage Of Rental Revenue And Other Income From Leasing Of Apartment Homes 99.00% 99.00% 99.00%  
CamdenResidentReliefFundPersons 8,200      
Equity in income of joint ventures [1] $ 8,052 [2] $ 14,783 $ 7,836 [2]  
Non-consolidated entity [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
CamdenResidentReliefFundPersons 1,100      
Consolidated Entities [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
CamdenResidentReliefFundPersons 7,100      
Camden Resident Relief Funds [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
CamdenResidentReliefFundsAmount $ 10,400      
Equity in income of joint ventures 400      
Camden Resident Relief Funds [Member] | Non-consolidated entity [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
CamdenResidentReliefFundsAmount 1,300      
Camden Resident Relief Funds [Member] | Consolidated Entities [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
CamdenResidentReliefFundsAmount $ 9,100      
Camden Operating L P [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest 92.00%      
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest 1.00%      
Camden Summit Partnership L P [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest 95.00%      
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest 1.00%      
Residential Leases [Member] | Maximum [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Lessor, Operating Lease, Term of Contract 14 months      
[1] Equity in income excludes our ownership interest of fee income from various services provided by us to the Funds.
[2] Equity in income for the year ended December 31, 2020 includes our ownership interest of the Resident Relief Funds payments of approximately $0.4 million. Equity in income for the year ended December 31, 2019 includes our ownership interest of the gain on sale of the operating property of approximately $6.2 million.