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SUBORDINATED DEBENTURES - Narrative (Details) - USD ($)
1 Months Ended 6 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
May 31, 2017
Jun. 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          
Repayments of related party debt       $ 3,000,000      
Subordinated debentures | Other Debentures Issued in July 2015 | Subsequent Event              
Debt Instrument [Line Items]              
Debentures that matured and were paid off $ 1,000,000            
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%    
Debenture outstanding         $ 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%