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BORROWINGS (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 17, 2020
USD ($)
BORROWINGS      
Number of unsecured federal funds lines of credit 3 3  
90 Day London Interbank Offered Rate [Member]      
BORROWINGS      
Basis spread (as a percent) 450.00%    
Federal Funds Lines of Credit One      
BORROWINGS      
Maximum borrowing capacity $ 10,000,000 $ 10,000,000  
Amount outstanding 0 0  
Federal Funds Lines of Credit Two      
BORROWINGS      
Maximum borrowing capacity 19,000,000 19,000,000  
Amount outstanding 0 0  
Federal Funds Line of Credit Three      
BORROWINGS      
Maximum borrowing capacity 25,000,000 25,000,000  
Amount outstanding $ 0 0  
Subordinated Notes 2020      
BORROWINGS      
Face amount     $ 8,000,000
interest rate (as a percent) 5.125%    
Promissory and Credit Note [Member]      
BORROWINGS      
Maximum borrowing capacity $ 5,000,000 5,000,000  
Amount outstanding $ 0 0  
Credit Note [Member] | London 30 Day Interbank Offered Rate [Member]      
BORROWINGS      
Basis spread (as a percent) 3.50%    
FHLB Topeka      
BORROWINGS      
Amount of collateral pledged $ 568,300,000 515,500,000  
Available balance 378,700,000    
Borrowings from FHLB $ 10,000,000 10,000,000  
August 26, 2020      
BORROWINGS      
Interest rate 1.94%    
Borrowings from FHLB $ 10,000,000 $ 10,000,000