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FAIR VALUE MEASUREMENTS - NONRECURRING BASIS (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Fair value      
Impaired loans $ 6,489   $ 3,852
Other real estate owned 2,526 $ 3,558  
Nonrecurring      
Fair value      
Total Losses 26 529  
Nonrecurring | Impaired loans      
Fair value      
Impaired loans 6,489 3,852  
Total Losses   141  
Nonrecurring | Other real estate owned      
Fair value      
Other real estate owned 2,526 3,558  
Total Losses 26 388  
Nonrecurring | Level 3 | Impaired loans      
Fair value      
Impaired loans 6,489 3,852  
Nonrecurring | Level 3 | Other real estate owned      
Fair value      
Other real estate owned $ 2,526 $ 3,558