COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Commitments to extend credit	$ 1,042,343	$ 1,101,257
Unused home equity lines of credit	64,561	62,586
Financial standby letters of credit	12,928	14,257
Mortgage interest rate lock commitments	138,325	91,426
Mortgage forward contracts with positive fair value	$ 149,250	$ 150,000