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SUBORDINATED DEBENTURES - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2020
Dec. 31, 2019
Jul. 31, 2019
Jul. 31, 2018
May 31, 2017
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2015
Debt Instrument [Line Items]                
Liquidation value per share             $ 1,000  
Debentures mature date             30 years  
Subordinated debentures | Trust II Debentures                
Debt Instrument [Line Items]                
Debenture issued             $ 3,093,000  
Subordinated debentures | Trust II Debentures | Minimum                
Debt Instrument [Line Items]                
Notice period required for redemption of debentures             30 days  
Subordinated debentures | Trust II Debentures | Maximum                
Debt Instrument [Line Items]                
Notice period required for redemption of debentures             60 days  
Redemption price of debentures as a percentage of principal             100.00%  
Subordinated debentures | Trust II Debentures | 3 Month LIBOR                
Debt Instrument [Line Items]                
Spread on variable rate             3.35%  
Subordinated debentures | Trust III Debentures                
Debt Instrument [Line Items]                
Debenture issued             $ 2,062,000  
Subordinated debentures | Trust III Debentures | Minimum                
Debt Instrument [Line Items]                
Notice period required for redemption of debentures             30 days  
Subordinated debentures | Trust III Debentures | Maximum                
Debt Instrument [Line Items]                
Notice period required for redemption of debentures             60 days  
Redemption price of debentures as a percentage of principal             100.00%  
Subordinated debentures | Trust III Debentures | 3 Month LIBOR                
Debt Instrument [Line Items]                
Spread on variable rate             1.67%  
Subordinated debentures | DCB Trust I Debentures                
Debt Instrument [Line Items]                
Debenture issued             $ 5,155,000  
Subordinated debentures | DCB Trust I Debentures | Minimum                
Debt Instrument [Line Items]                
Notice period required for redemption of debentures             30 days  
Subordinated debentures | DCB Trust I Debentures | Maximum                
Debt Instrument [Line Items]                
Notice period required for redemption of debentures             60 days  
Redemption price of debentures as a percentage of principal             100.00%  
Subordinated debentures | DCB Trust I Debentures | 3 Month LIBOR                
Debt Instrument [Line Items]                
Spread on variable rate             1.80%  
Subordinated debentures | Other Debentures Issued in December 2015                
Debt Instrument [Line Items]                
Notice period required for redemption of debentures 30 days              
Redemption price of debentures as a percentage of principal 100.00%              
Debenture issued               $ 5,000,000
Debenture issued, par value per instrument issued $ 500,000              
Debt instrument maturity start date Nov. 01, 2020              
Debt instrument maturity end date Nov. 01, 2024              
Repayments of related party debt         $ 2,000,000      
Subordinated debentures | Other Debentures Issued in December 2015 | Directors and Related Parties                
Debt Instrument [Line Items]                
Debenture issued $ 10,000,000             $ 2,500,000
Subordinated debentures | Other Debentures Issued in December 2015 | Minimum                
Debt Instrument [Line Items]                
Stated interest rate 1.00%              
Subordinated debentures | Other Debentures Issued in December 2015 | Maximum                
Debt Instrument [Line Items]                
Stated interest rate 4.00%              
Subordinated debentures | Other Debentures Issued in July 2015                
Debt Instrument [Line Items]                
Debentures that matured and were paid off   $ 500,000 $ 1,000,000 $ 1,000,000   $ 500,000