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OTHER REAL ESTATE OWNED - Activities in Other Real Estate Owned (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Real Estate and Foreclosed Assets [Roll Forward]      
Balance at beginning of year $ 2,502 $ 1,097 $ 423
Additions 3,086 3,269 1,598
Sales and net direct write-downs (3,556) (1,833) (886)
Net change in valuation allowance (236) (31) (38)
Balance at end of year $ 1,796 $ 2,502 $ 1,097