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Junior Subordinated Debentures (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Oct. 16, 2014
Jun. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Mar. 17, 2004
Junior Subordinated Debentures          
Junior subordinated debentures     $ 4,590 $ 5,100  
Floating Rate Junior Subordinated Debentures          
Junior Subordinated Debentures          
Junior subordinated debentures $ 5,100   $ 4,600    
Effective interest rate on debentures (as a percent)     4.68%    
Payment of principal amount at face value required to extend maturity $ 900        
First principal payment   $ 255 $ 510    
Floating Rate Junior Subordinated Debentures | 3-month LIBOR          
Junior Subordinated Debentures          
Debt instrument interest rate description     3-Month LIBOR    
Basis spread (as a percent)     2.54%    
Private Placement | Floating Rate Junior Subordinated Debentures          
Junior Subordinated Debentures          
Junior subordinated debentures         $ 6,000