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Junior Subordinated Debentures (Details) - USD ($)
$ in Thousands
12 Months Ended
Oct. 16, 2014
Dec. 31, 2019
Dec. 31, 2018
Mar. 17, 2004
Junior Subordinated Debentures        
Junior subordinated debentures   $ 4,335 $ 5,100  
Floating Rate Junior Subordinated Debentures        
Junior Subordinated Debentures        
Junior subordinated debentures $ 5,100      
Effective interest rate on debentures (as a percent)   4.44%    
Payment of principal amount at face value required to extend maturity $ 900      
Scheduled principal paid   $ 765    
Scheduled principal repayments        
2020   1,020    
2021   1,020    
2022   1,020    
2023   1,020    
2024   255    
Total   $ 4,335    
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