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SECURITIES AVAILABLE FOR SALE - Proceeds from Sale of AFS Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]          
Proceeds from sale of AFS securities $ 103,666 $ 0 $ 162,319 $ 64,742  
Gross gains 670 0 1,477 1,468  
Gross losses 137 $ 0 287 $ 48  
AFS securities pledged to secure public funds, fair value $ 322,278   $ 322,278   $ 317,282