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SECURITIES AVAILABLE FOR SALE - Proceeds from Sale of AFS Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]          
Proceeds from sale of AFS securities $ 23,581 $ 0 $ 58,653 $ 64,743  
Gross gains 654 0 807 1,468  
Gross losses 0 $ 0 150 $ 48  
AFS securities pledged to secure public funds, fair value $ 328,664   $ 328,664   $ 317,282