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Borrowings - Long-term Debt (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]        
Long-term debt outstanding   $ 34,500,000    
Proceeds from long-term debt, net of costs   0 $ 3,750,000 $ 0
Parent Company        
Debt Instrument [Line Items]        
Proceeds from long-term debt, net of costs   0 3,750,000 0
Funds invested in bank subsidiary $ 3,800,000 0 3,750,000 $ 0
Senior Long-term Debt        
Debt Instrument [Line Items]        
Long-term debt outstanding   $ 19,838,000    
Debt instrument, face amount 25,000,000      
Proceeds from long-term debt, net of costs $ 3,750,000      
Senior Long-term Debt | Wall Street Journal Prime Rate        
Debt Instrument [Line Items]        
Percentage of interest used in secured pledge borrowings   13.20%    
Number of shares used in secured pledge borrowings (in shares)   735,745    
Senior Long-term Debt | Floating 3-Month LIBOR        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate   2.50%    
Interest rate   4.92%    
Long-term debt outstanding   $ 19,800,000 22,800,000  
Periodic principal payment   $ 735,294    
Principal payment frequency   quarterly    
Debt maturity date   Dec. 22, 2020    
Percentage of interest used in secured pledge borrowings   85.00%    
Number of shares used in secured pledge borrowings (in shares)   4,823,899    
Junior Subordinated Debt        
Debt Instrument [Line Items]        
Long-term debt outstanding   $ 14,700,000    
Junior Subordinated Debt | Wall Street Journal Prime Rate        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate   0.75%    
Interest rate   4.00%    
Long-term debt outstanding   $ 14,700,000 $ 14,700,000  
Debt maturity date   Dec. 21, 2025    
Junior Subordinated Debt | Wall Street Journal Prime Rate | Fixed Interest Rate Period        
Debt Instrument [Line Items]        
Principal payment frequency   semi-annually    
Junior Subordinated Debt | Wall Street Journal Prime Rate | Floating Interest Rate Period        
Debt Instrument [Line Items]        
Principal payment frequency   quarterly