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SUBORDINATED DEBENTURES - Narrative (Details)
1 Months Ended 6 Months Ended 12 Months Ended
May 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
trust
$ / shares
Jun. 30, 2016
USD ($)
Dec. 31, 2016
Dec. 31, 2015
USD ($)
Jul. 31, 2015
USD ($)
Debt Instrument [Line Items]            
Repayments of debentures   $ 5,000,000 $ 1,000,000      
Subordinated Debentures            
Debt Instrument [Line Items]            
Debenture term   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%   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]            
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       $ 4,000,000
Subordinated Debentures | Other Debentures Issued in July 2015 | Directors and Related Parties            
Debt Instrument [Line Items]            
Debenture issued           $ 3,000,000
Repayments of debentures $ 3,000,000          
Subordinated Debentures | Other Subordinated Debentures, 2.50%            
Debt Instrument [Line Items]            
Debenture issued, par value per instrument issued   $ 500,000        
Stated interest rate   2.50%        
Subordinated Debentures | Other Subordinated Debentures, 4.00%            
Debt Instrument [Line Items]            
Debenture issued, par value per instrument issued   $ 500,000        
Stated interest rate   4.00%        
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   $ 3,000,000     $ 5,000,000  
Repayments of debentures $ 2,000,000          
Debenture issued, par value per instrument issued   $ 500,000        
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   3.00%        
Subordinated Debentures | Other Debentures Issued in December 2015 | Maximum            
Debt Instrument [Line Items]            
Stated interest rate   5.00%        
Capital trust pass-through securities            
Debt Instrument [Line Items]            
Number of trusts | trust   3        
Liquidation value per share (in USD per share) | $ / shares   $ 1,000