COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Lending commitments:
Commitments to extend credit	$ 1,454,630	$ 799,058
Financial standby letters of credit	22,625	16,342
Other commitments:
Standby letters of credit issued by the FHLB on the Bank's behalf	31,000	10,000
Capital commitments to private investment funds	0	4,751
Reserve for unfunded commitments	$ 1,059	$ 603