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FAIR VALUE MEASUREMENTS - NONRECURRING BASIS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair value      
Impaired loans $ 3,852 $ 6,757  
Other real estate owned 3,558 4,782 $ 2,324
Nonrecurring      
Fair value      
Impaired loans   3,852 9,856
Other real estate owned   3,558 $ 4,782
Total Losses 529 845  
Investments 0    
Nonrecurring | Impaired loans      
Fair value      
Total Losses 141 643  
Nonrecurring | Other real estate owned      
Fair value      
Total Losses 388 202  
Nonrecurring | Level 3      
Fair value      
Impaired loans 3,852 9,856  
Other real estate owned $ 3,558 $ 4,782