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Borrowings (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Oct. 16, 2014
Jun. 30, 2020
Dec. 31, 2019
Mar. 17, 2004
Borrowings        
Advances from Federal Home Loan Banks   $ 116,500 $ 84,000  
Weighted average interest rate   1.84% 2.32%  
Weighted average contractual maturity (in months)   31 months 18 months  
Junior subordinated debentures   $ 3,825 $ 4,335  
First principal payment   $ 1,300    
Floating Rate Junior Subordinated Debentures        
Borrowings        
Effective interest rate on debentures (as a percent)   2.86%    
Junior subordinated debentures $ 5,100      
Payment of principal amount at face value required to extend maturity $ 900      
Floating Rate Junior Subordinated Debentures | 3-month LIBOR        
Borrowings        
Interest rate basis   3-Month LIBOR    
Basis spread (as a percent)   2.54%    
Private Placement | Floating Rate Junior Subordinated Debentures        
Borrowings        
Junior subordinated debentures       $ 6,000
First mortgage loans        
Borrowings        
FHLB advances, collateral real estate loans   $ 210,400 $ 156,100