COMMITMENTS AND CONTINGENT LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Commitments to extend credit	$ 1,101,257	$ 548,898
Unused home equity lines of credit	62,586	52,798
Financial standby letters of credit	14,257	14,712
Mortgage interest rate lock commitments	91,426	77,710
Mortgage forward contracts with positive fair value	$ 150,000	$ 0