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INVESTMENT SECURITIES - Schedules of Proceeds from Sale of Investment Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]        
Proceeds from sale $ 63,488 $ 5,998 $ 82,537 $ 14,416
Gross gains 27 204 275 428
Gross losses $ 0 $ 0 $ (33) $ 0