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INCOME TAXES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]        
Income tax expense related to net securities gains $ 6 $ 181 $ 187 $ 405
Federal statutory rate     21.00% 34.00%