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Borrowings (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Oct. 16, 2014
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Mar. 17, 2004
Borrowings [Abstract]          
Advances from Federal Home Loan Banks   $ 115,500   $ 84,000  
Weighted average interest rate   1.85%   2.32%  
Weighted average contractual maturity   28 months   18 months  
Junior subordinated debentures   $ 3,570   $ 4,335  
Payment of principal amount   $ 765 $ 510    
Floating Rate Junior Subordinated Debentures [Member]          
Borrowings [Abstract]          
Junior subordinated debentures $ 5,100        
Effective interest rate percentage on debentures   2.79%      
Payment of principal amount $ 900        
Debt instrument, maturity date   Mar. 17, 2024      
Scheduled principal payment   $ 1,500      
Floating Rate Junior Subordinated Debentures [Member] | 3-Month LIBOR [Member]          
Borrowings [Abstract]          
Basis spread   2.54%      
Private Placement [Member] | Floating Rate Junior Subordinated Debentures [Member]          
Borrowings [Abstract]          
Junior subordinated debentures         $ 6,000
First Mortgage Loans [Member]          
Borrowings [Abstract]          
FHLB advances, collateral real estate loans   $ 204,600   $ 156,100