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Real Estate Owned (Details)
$ in Thousands
12 Months Ended
Jan. 26, 2018
USD ($)
Dec. 31, 2017
USD ($)
ft²
Dec. 31, 2016
USD ($)
Property, Plant And Equipment [Line Items]      
Less: Real estate carrying value, (net of accumulated depreciation)   $ (1,632) $ (1,680)
Commercial Office Building [Member]      
Property, Plant And Equipment [Line Items]      
Area of building in square feet | ft²   14,500  
Square feet utilized by Company | ft²   3,500  
Number of years depreciation is based upon   39 years  
Commercial Office Building [Member] | Subsequent Event [Member]      
Property, Plant And Equipment [Line Items]      
Gross sales price $ 5,200    
Less: Transactions costs (290)    
Net cash proceeds 4,910    
Less: Real estate carrying value, (net of accumulated depreciation) (1,632)    
Net gain on sale of real estate $ 3,278