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Debt (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
May 03, 2016
Dec. 15, 2015
Dec. 31, 2017
Dec. 31, 2016
Mar. 12, 2018
Sep. 01, 2017
Dec. 01, 2016
Jul. 30, 2015
Debt Instrument [Line Items]                
Notes payable     $ 9,926 $ 10,948        
Borrowings on lines of credit     107,000 75,000        
Other Assets                
Debt Instrument [Line Items]                
Payments of Debt Issuance Costs     1,200 800        
Inwood National Bank | Johns Creek Carrollton Allen                
Debt Instrument [Line Items]                
Borrowings on lines of credit     $ 32,000 $ 15,000        
Inwood National Bank | Johns Creek Carrollton Allen | Other Assets                
Debt Instrument [Line Items]                
Payments of Debt Issuance Costs $ 100              
Citibank, N.A. and Credit Suisse AG, CAyman Islands Branch [Member] | Unsecured Debt                
Debt Instrument [Line Items]                
Debt Instrument, Basis Spread on Variable Rate   1.50%            
Citibank, N.A. and Credit Suisse AG, CAyman Islands Branch [Member] | Unsecured Revolving Credit Facility | Unsecured Debt                
Debt Instrument [Line Items]                
Borrowings on lines of credit   $ 40,000            
Citibank, N.A. and Credit Suisse AG, CAyman Islands Branch [Member] | Maximum | Unsecured Revolving Credit Facility | Unsecured Debt                
Debt Instrument [Line Items]                
Borrowings on lines of credit   75,000            
Citibank, N.A. [Member] | Unsecured Revolving Credit Facility | Unsecured Debt                
Debt Instrument [Line Items]                
Borrowings on lines of credit   25,000         $ 35,000  
Credit Suisse AG, Cayman Islands Branch [Member] | Unsecured Revolving Credit Facility | Unsecured Debt                
Debt Instrument [Line Items]                
Borrowings on lines of credit   $ 15,000       $ 25,000    
Flagstar Bank and JP Morgan Chase Bank | Unsecured Revolving Credit Facility | Unsecured Debt | Subsequent Event                
Debt Instrument [Line Items]                
Borrowings on lines of credit         $ 30,000      
Citibank, N.A., Credit Suisse AG, Cayman Islands Branch, Flagstar Bank and JP Morgan Chase [Member] | Unsecured Revolving Credit Facility | Unsecured Debt | Subsequent Event                
Debt Instrument [Line Items]                
Borrowings on lines of credit         $ 160,000      
Subsidiary of JBGL | Inwood National Bank | Minimum | Johns Creek Carrollton Allen                
Debt Instrument [Line Items]                
Stated interest rate               4.00%
Subsidiary of JBGL | Inwood National Bank | Maximum | Johns Creek Carrollton Allen                
Debt Instrument [Line Items]                
Stated interest rate               18.00%
Federal Funds Rate [Domain] | Citibank, N.A. and Credit Suisse AG, CAyman Islands Branch [Member] | Unsecured Debt                
Debt Instrument [Line Items]                
Debt Instrument, Basis Spread on Variable Rate   0.50%            
London Interbank Offered Rate (LIBOR) [Member] | Citibank, N.A. and Credit Suisse AG, CAyman Islands Branch [Member] | Unsecured Debt                
Debt Instrument [Line Items]                
Debt Instrument, Basis Spread on Variable Rate   1.00%            
London Interbank Offered Rate (LIBOR) [Member] | Citibank, N.A. and Credit Suisse AG, CAyman Islands Branch [Member] | Unsecured Debt                
Debt Instrument [Line Items]                
Debt Instrument, Basis Spread on Variable Rate   2.50%