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BORROWED FUNDS - Subordinated Debt (Details) - USD ($)
12 Months Ended
Jun. 30, 2014
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mar. 31, 2007
Subordinated Debt          
Balance at end of year   $ 33,524,000 $ 33,524,000    
Interest expense on borrowed funds   2,242,000 2,226,000 $ 2,204,000  
Subordinated Debt          
Subordinated Debt          
Balance at end of year   33,524,000 33,524,000 33,524,000  
Average balance during the year   33,524,000 33,524,000 33,524,000  
Maximum month-end balance   $ 33,524,000 $ 33,524,000 $ 33,524,000  
Weighted-average rate during the year   6.69% 6.64% 6.57%  
Weighted-average rate at December 31   6.70% 6.63% 6.57%  
Interest expense on borrowed funds   $ 2,200,000 $ 2,200,000 $ 2,200,000  
Subordinated Debentures | Subordinated Debt          
Subordinated Debt          
Face amount of debt issued         $ 4,000,000
Subordinated Debentures | LIBOR | Subordinated Debt          
Subordinated Debt          
Variable rate basis spread   1.62%      
Convertible Subordinated Promissory Notes Due 2024 | Subordinated Debt          
Subordinated Debt          
Face amount of debt issued $ 29,400,000        
Debt instrument, investment amount of holder 100,000        
Debt instrument, minimum ownership of common stock as percentage of principal acquired $ 1,000,000        
Term of debt instrument 10 years        
Debt instrument, maximum interest rate after fifth anniversary   9.00%      
Debt instrument, minimum period from issuance that principal may be prepaid   5 years      
Debt instrument, threshold consecutive trading days for conversion after first, second, third, fourth, and fifth anniversaries of the issuance   30 days      
Debt instrument, conversion price (in dollars per share)   $ 16      
Debt instrument, notice period of intent to prepay   20 days      
Debt instrument, issuance threshold amount requiring consent of holders   $ 15,000,000      
Debt instrument, redemption price percentage   100.00%      
Debt instrument, required period before redemption   5 years      
Convertible Subordinated Promissory Notes Due 2024 | Subordinated Debt | Debtholder Investments Less Than Three Million Dollars          
Subordinated Debt          
Debt instrument, investment amount of holder   $ 3,000,000      
Debt instrument, minimum ownership of common stock as percentage of principal acquired   30.00%      
Interest rate on debt security   7.00%      
Convertible Subordinated Promissory Notes Due 2024 | Subordinated Debt | Debtholder Investments Of Three Million Dollars Or Greater          
Subordinated Debt          
Debt instrument, investment amount of holder   $ 3,000,000      
Debt instrument, minimum ownership of common stock as percentage of principal acquired   30.00%      
Interest rate on debt security   7.50%      
Convertible Subordinated Promissory Notes Due 2024 | Subordinated Debt | Debtholder Investments Of Ten Million Dollars Or Greater          
Subordinated Debt          
Debt instrument, investment amount of holder   $ 10,000,000      
Interest rate on debt security   7.00%      
Convertible Subordinated Promissory Notes Due 2024 | LIBOR | Subordinated Debt          
Subordinated Debt          
Debt instrument, basis spread on variable rate after fifth anniversary   5.00%