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Real Estate Transactions - Narrative (Details)
ft² in Thousands
1 Months Ended 6 Months Ended 12 Months Ended
May 09, 2018
shares
Jan. 12, 2018
USD ($)
ft²
apartment
May 31, 2018
USD ($)
a
shares
Sep. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Jan. 31, 2017
USD ($)
Aug. 31, 2016
a
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
property
Jan. 31, 2018
USD ($)
Jan. 18, 2017
USD ($)
Business Acquisition [Line Items]                        
Payments to acquire real estate               $ 2,911,000 $ 7,280,000      
Rent expense               $ 395,400 $ 379,300      
Number of properties purchased | property                   1    
Great Eastern Shopping Center                        
Business Acquisition [Line Items]                        
Proceeds from sale of real estate       $ 8,500,000                
Gains (losses) on sales of investment real estate       500,000                
Burtonsville Town Square                        
Business Acquisition [Line Items]                        
Payments to acquire real estate           $ 76,400,000       $ 76,400,000    
Portion of purchase price allocated to land                   28,400,000    
Portion of purchase price allocated to buildings                   45,800,000    
Portion of purchase price allocated to below market leases                   (600,000)    
Olney                        
Business Acquisition [Line Items]                        
Payments to acquire real estate         $ 3,100,000              
Rent expense         $ 56,000              
Ashbrook Marketplace                        
Business Acquisition [Line Items]                        
Acquisition costs     $ 200,000                  
Area of real estate acquired (in acres) | a     13.7                  
Additions to real estate investments, noncash     $ 8,776,000                  
Great Eastern Shopping Center                        
Business Acquisition [Line Items]                        
Second trust financing       $ 1,280,000                
Second trust financing, stated interest rate       6.00%                
7316 Wisconsin Avenue                        
Business Acquisition [Line Items]                        
Payments to acquire real estate   $ 35,500,000                    
Property acquisition costs   700,000                    
Earnest money deposits   $ 3,500,000                    
Number of units in real estate property | apartment   325                    
7316 Wisconsin Avenue Retail Space                        
Business Acquisition [Line Items]                        
Area of real estate property (in square feet) | ft²   10                    
Leases, Acquired-in-Place | Burtonsville Town Square                        
Business Acquisition [Line Items]                        
Portion of purchase price allocated to in-place leases and above market leases                   2,200,000    
Above Market Leases | Burtonsville Town Square                        
Business Acquisition [Line Items]                        
Portion of purchase price allocated to in-place leases and above market leases                   $ 600,000    
BF Saul Real Estate Investment Trust | Ashbrook Marketplace                        
Business Acquisition [Line Items]                        
Limited partnership units issued for purchase (in shares) | shares 176,680   176,680                  
Area of real estate acquired (in acres) | a             13.7          
Burtonsville Fixed Rate Mortgage                        
Business Acquisition [Line Items]                        
Construction-to-permanent loan                     $ 40,000,000.0 $ 40,000,000