ASSETS ACQUIRED IN FDIC-ASSISTED ACQUISITIONS - Changes in FDIC Shared-Loss Receivable (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Business Combinations [Abstract]
Beginning balance		$ 6,301
Beginning balance	$ (6,313)
Payments to (received from) FDIC	97	(4,770)
Amortization	(747)	(3,351)
Changes in clawback liability	(326)	(682)
Increase in receivable due to:
Net recoveries on covered loans	(1,097)	(4,118)
Loss (gain) on covered other real estate owned	(76)	203
Reimbursable expenses on covered assets	401	604
Other activity, net	(129)	(1,962)
Ending balance	$ (8,190)	$ (7,775)