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Subordinated Notes (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Apr. 20, 2012
USD ($)
purchaser
Subordinated notes $ 15,000,000 $ 15,000,000  
Trust I      
Preferred securities issued 15,000,000    
Junior subordinated notes      
Junior subordinated debt purchased by Trust I $ 15,500,000    
Trust preferred securities      
Variable rate basis three-month LIBOR plus 148 basis points    
Basis spread on variable rate (percent) 1.48%    
Subordinated debt | 7% Subordinated notes due April 20, 2022      
Subordinated borrowing, number of purchasers | purchaser     56
Aggregate principal amount     $ 30,000,000
Interest rate 7.00%    
Interest Expense, Debt   $ 140,000