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SUBORDINATED DEBENTURES - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Jul. 31, 2018
Jul. 31, 2017
May 31, 2017
Mar. 31, 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 | 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       $ 2,000,000 $ 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       Jul. 01, 2019    
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       3.50%    
Subordinated debentures | Other Debentures Issued in December 2015 | Maximum            
Debt Instrument [Line Items]            
Stated interest rate       5.00%