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Borrowings - Revolving Credit Agreement (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Line of Credit Facility [Line Items]    
Outstanding line of credit $ 3,333,000 $ 0
Revolving Credit Facility | FNCC Credit Agreement    
Line of Credit Facility [Line Items]    
Outstanding line of credit 3,300,000  
Line of credit, maximum borrowing capacity $ 5,000,000  
Revolving Credit Facility | FNCC Credit Agreement | Prime Rate    
Line of Credit Facility [Line Items]    
Interest rate 1.25%