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ACCUMULATED OTHER COMPREHENSIVE LOSS - Reclassifications from AOCL (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net realized (loss) gain on securities sales $ (50) $ 167 $ 82
Tax benefit (4,599) (8,238) (4,715)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains and (Losses) on Securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net realized (loss) gain on securities sales 50 (167) (82)
Tax benefit (10) 59 29
Net of Tax $ 40 $ (108) $ (53)