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Real Estate Transactions - Narrative (Details)
ft² in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
May 09, 2018
shares
Sep. 30, 2018
USD ($)
ft²
apartment
May 31, 2018
USD ($)
a
shares
Sep. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Jan. 31, 2017
USD ($)
Aug. 31, 2016
a
Sep. 30, 2018
USD ($)
ft²
property
apartment
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
property
Jan. 18, 2017
USD ($)
Business Acquisition [Line Items]                      
Payments to acquire real estate               $ 6,586,000 $ 12,389,000    
Rent expense               $ 590,000 578,200    
Number of properties purchased | property               1   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]                      
Area of real estate acquired (in acres) | a     13.7                
Additions to real estate investments, noncash     $ 8,800,000         $ 8,776,000      
Acquisition costs     $ 200,000                
7316 Wisconsin Avenue                      
Business Acquisition [Line Items]                      
Payments to acquire real estate   $ 35,500,000           36,200,000      
Portion of purchase price allocated to land   34,200,000           34,200,000      
Portion of purchase price allocated to buildings   1,000,000           1,000,000      
Property acquisition costs   $ 700,000           $ 700,000      
7316 Wisconsin Avenue Retail Space                      
Business Acquisition [Line Items]                      
Area of real estate property (in square feet) | ft²   10           10      
Great Eastern Shopping Center                      
Business Acquisition [Line Items]                      
Second trust financing   $ 1,275,000   $ 1,280,000       $ 1,275,000 $ 1,280,000    
Second trust financing, stated interest rate       6.00%              
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  
Leases, Acquired-in-Place | 7316 Wisconsin Avenue                      
Business Acquisition [Line Items]                      
Portion of purchase price allocated to in-place leases and above market leases   900,000           900,000      
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  
Above Market Leases | 7316 Wisconsin Avenue                      
Business Acquisition [Line Items]                      
Portion of purchase price allocated to in-place leases and above market leases   $ 100,000           $ 100,000      
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
Maximum | 7316 Wisconsin Avenue                      
Business Acquisition [Line Items]                      
Number of units in real estate property | apartment   325           325