COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Lending commitments:
Commitments to extend credit	$ 1,471,606	$ 799,058
Commercial letters of credit	22,928	16,342
Other commitments:
Standby letters of credit issued by the FHLB on the Bank's behalf	31,000	10,000
Reserve for unfunded commitments	$ 1,105	$ 603