ALLOWANCE FOR LOAN AND LEASE LOSSES - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Net charge-offs	$ 1,000	$ 700	$ 688	$ 4,600	$ 7,022
Provision for loan and lease losses	1,265	(200)	1,663	(2,805)	$ (1,841)
Allowance for covered loan losses	11,000	11,500	11,000	11,500
Loss sharing expense	574	1,002	1,451	4,036
Loss (gain) - covered other real estate owned	100	(1,400)	500	(1,000)
FDIC loss sharing income	$ (973)	$ (192)	$ (2,323)	$ 408