FAIR VALUE - GAINS AND LOSSES (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
loan
Dec. 31, 2015
USD ($)
loan
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Fair Value, Option        
Aggregate fair value of mortgage loan $ 11,662 $ 4,083 $ 6,388 $ 3,506
Aggregate fair value of consumer loan $ 2,198      
Consumer loans held for sale period 21 days      
Mortgage loans held for sale        
Fair Value, Option        
Number of loans past due 90 days or more or on nonaccrual | loan 0 0    
Aggregate fair value of mortgage loan $ 11,662 $ 4,083    
Contractual balance 11,568 3,993    
Unrealized gain 94 90    
Gains (losses) from changes in fair value included in earnings 204 186 217  
Mortgage loans held for sale | Interest Income        
Fair Value, Option        
Gains (losses) from changes in fair value included in earnings 200 219 183  
Mortgage loans held for sale | Change In Fair Value        
Fair Value, Option        
Gains (losses) from changes in fair value included in earnings $ 4 $ (33) $ 34  
Consumer Loans Held For Sale        
Fair Value, Option        
Number of loans past due 90 days or more or on nonaccrual | loan 0      
Aggregate fair value of consumer loan $ 2,198      
Contractual balance 2,084      
Unrealized gain 114      
Gains (losses) from changes in fair value included in earnings $ 814      
Consumer loans held for sale period 21 days      
Consumer Loans Held For Sale | Interest Income        
Fair Value, Option        
Gains (losses) from changes in fair value included in earnings $ 700      
Consumer Loans Held For Sale | Change In Fair Value        
Fair Value, Option        
Gains (losses) from changes in fair value included in earnings $ 114