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SUBORDINATED DEBENTURES - Narrative (Details) - USD ($)
1 Months Ended 9 Months Ended
Jul. 31, 2019
Jan. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
May 31, 2017
Sep. 30, 2019
Dec. 31, 2015
Jul. 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 July 2015                
Debt Instrument [Line Items]                
Debenture issued               $ 4,000,000
Debentures that matured and were paid off $ 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           $ 1,000,000 $ 5,000,000  
Repayments of related party debt         $ 2,000,000      
Debenture issued, par value per instrument issued           $ 500,000    
Debt instrument maturity start date           Jan. 01, 2020    
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 | Minimum                
Debt Instrument [Line Items]                
Stated interest rate           4.50%    
Subordinated debentures | Other Debentures Issued in December 2015 | Maximum                
Debt Instrument [Line Items]                
Stated interest rate           5.00%