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SUBORDINATED DEBENTURES - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2019
Jul. 31, 2019
Jan. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
May 31, 2017
Dec. 31, 2019
Dec. 31, 2015
Jul. 31, 2015
Debt Instrument [Line Items]                  
Liquidation value per share $ 1,000,000           $ 1,000,000    
Debentures mature date 30 years           30 years    
Subordinated debentures | Trust II Debentures                  
Debt Instrument [Line Items]                  
Debenture issued $ 3,093,000           $ 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           $ 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           $ 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 July 2015                  
Debt Instrument [Line Items]                  
Debenture issued                 $ 4,000,000
Debentures that matured and were paid off 500,000 $ 1,000,000   $ 1,000,000          
Repayments of related party debt             $ 3,000,000    
Subordinated debentures | Other Debentures Issued in July 2015 | Directors and Related Parties                  
Debt Instrument [Line Items]                  
Debenture issued                 $ 3,000,000
Subordinated debentures | Other Subordinated Debentures Issued in July 2015, 2.50%, Maturing July 1, 2017                  
Debt Instrument [Line Items]                  
Stated interest rate         2.50%        
Debentures that matured and were paid off         $ 500,000        
Subordinated debentures | Other Subordinated Debentures Issued in July 2015, 4.00%, Maturing January 1, 2019                  
Debt Instrument [Line Items]                  
Stated interest rate     4.00%            
Debentures that matured and were paid off     $ 500,000            
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 500,000           $ 500,000 $ 5,000,000  
Repayments of related party debt           $ 2,000,000      
Debenture issued, par value per instrument issued $ 500,000           $ 500,000    
Debt instrument maturity end date             Jul. 01, 2020    
Subordinated debentures | Other Debentures Issued in December 2015 | Directors and Related Parties                  
Debt Instrument [Line Items]                  
Debenture issued               $ 2,500,000  
Subordinated debentures | Other Debentures Issued in December 2015 | Maximum                  
Debt Instrument [Line Items]                  
Stated interest rate 5.00%           5.00%