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Real Estate Owned (REO) - Additional Information (Details)
3 Months Ended 9 Months Ended
Oct. 11, 2019
USD ($)
Sep. 30, 2019
USD ($)
a
Property
Sep. 30, 2018
USD ($)
Property
Sep. 30, 2019
USD ($)
a
Property
Sep. 30, 2018
USD ($)
Property
Dec. 31, 2018
USD ($)
Real Estate Owned REO Details [Line Items]            
Carrying value of real estate properties   $ 3,943,000   $ 3,943,000   $ 4,153,000
Valuation adjustment   (210,000) $ (48,000) (210,000) $ (48,000)  
REO - sales, net         3,321,000  
Rental operations, net   0 $ 0 0 0  
Partnership Property Held For Sale [Member]            
Real Estate Owned REO Details [Line Items]            
Carrying value of real estate properties   $ 3,673,000   $ 3,673,000    
Number of real estate unsold properties | Property   3   3    
Marin County [Member]            
Real Estate Owned REO Details [Line Items]            
Valuation adjustment       $ 210,000,000    
Marin County [Member] | Subsequent Event [Member]            
Real Estate Owned REO Details [Line Items]            
Proceeds from sale of real estate $ 270,300          
Marin County [Member] | Partnership Property Held For Sale [Member] | Residential Single Family [Member]            
Real Estate Owned REO Details [Line Items]            
Area of Real Estate Property (in Acres) | a   13   13    
San Francisco County [Member] | Partnership Property Held For Sale [Member] | Condominium Complex [Member]            
Real Estate Owned REO Details [Line Items]            
Number of Units in Real Estate Property | Property   3   3    
Fresno County California [Member] | Partnership Property Held For Sale [Member] | Home Subdivision [Member]            
Real Estate Owned REO Details [Line Items]            
Number of Real Estate Properties | Property   1   1    
Stanislaus County [Member] | Partnership Property Held For Sale [Member] | Commercial Property [Member]            
Real Estate Owned REO Details [Line Items]            
Area of Real Estate Property (in Acres) | a   14   14    
Los Angeles [Member] | Condominium Complex [Member]            
Real Estate Owned REO Details [Line Items]            
Gains (Losses) on Sales of Other Real Estate (in Dollars)         113,000  
REO - sales, net         $ 1,928,000  
Los Angeles [Member] | Sold [Member] | Condominium Complex [Member]            
Real Estate Owned REO Details [Line Items]            
Number of Real Estate Properties | Property     6   6