ASSETS ACQUIRED IN FDIC-ASSISTED ACQUISITIONS - Changes in FDIC Shared-Loss Receivable(Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
FDIC Indemnification Asset [Roll Forward]
Balance, January 1	$ (6,313)	$ 6,301
Payments to (received from) FDIC	(515)	816
Accretion, net	(864)	(3,913)
Change in clawback liability	(674)	(1,056)
Change in receivable due to:
Net recoveries on covered loans	(1,563)	(4,804)
Loss (gain) on covered other real estate owned including writedowns	(86)	233
Reimbursable expenses on covered assets	488	749
Other activity, net	(306)	(3,007)
Ending balance	$ (8,803)	$ (6,313)