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Shareholders' Equity and Debt (Debt) (Details) - USD ($)
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Oct. 17, 2018
Line of Credit Facility [Line Items]      
Revolving line of credit $ 20,000,000 $ 20,000,000  
Pinnacle Bank | Second Amendment | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Line of credit, maximum borrowing capacity     $ 20,000,000.0
Pinnacle Bank | Line of Credit | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Line of credit, maximum borrowing capacity 12,000,000.0    
Line of credit, maximum borrowing capacity upon satisfaction of certain conditions $ 20,000,000.0    
Interest rate spread 5.15%    
Line of credit, unused capacity, commitment fee percentage 0.25%    
Pinnacle Bank | Line of Credit | Revolving Credit Facility | Minimum      
Line of Credit Facility [Line Items]      
Interest rate spread 1.75%    
Pinnacle Bank | Line of Credit | Revolving Credit Facility | Maximum      
Line of Credit Facility [Line Items]      
Interest rate spread 2.75%