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Real Estate Sold (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Information Relating to Sale of Real Estate Owned [Abstract]          
Less: Real estate carrying value, (net of accumulated depreciation) $ 0   $ 0   $ (1,632)
Net gain on sale of real estate 0 $ 0 3,278 $ 0  
Commercial Office Building [Member]          
Information Relating to Sale of Real Estate Owned [Abstract]          
Gross sales price     5,200    
Less: Transactions costs     (290)    
Proceeds from the sale of real estate owned, net     4,910    
Less: Real estate carrying value, (net of accumulated depreciation) $ (1,632)   (1,632)    
Net gain on sale of real estate     $ 3,278