COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Commitments to extend credit	$ 1,167,344	$ 1,101,257
Unused home equity lines of credit	62,927	62,586
Financial standby letters of credit	15,810	14,257
Mortgage interest rate lock commitments	124,565	91,426
Mortgage forward contracts with positive fair value	$ 0	$ 150,000