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Junior Subordinated Debentures (Details) - USD ($)
$ in Thousands
3 Months Ended
Oct. 16, 2014
Mar. 31, 2018
Dec. 31, 2017
Mar. 17, 2004
Junior Subordinated Debentures        
Junior subordinated debentures   $ 5,100 $ 5,100  
Floating Rate Junior Subordinated Debentures        
Junior Subordinated Debentures        
Junior subordinated debentures $ 5,100      
Effective interest rate on debentures (as a percent)   4.72%    
Payment of principal amount at face value required to extend maturity $ 900      
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%    
Floating Rate Junior Subordinated Debentures | Private Placement        
Junior Subordinated Debentures        
Junior subordinated debentures       $ 6,000