CREDIT QUALITY ASSESSMENT (Summary Information on Allowance for Loan and Lease Loss Activity) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Credit Quality Assessment [Abstract]
Balance at beginning of year			$ 44,067	$ 40,895	$ 40,895
Provision for loan losses	$ 934	$ 781	2,450	4,974	5,546
Loan and lease charge-offs			(2,044)	(2,586)	(3,134)
Loan and lease recoveries			451	659	760
Net charge-offs			(1,593)	(1,927)	(2,374)
Balance at period end	$ 44,924	$ 43,942	$ 44,924	$ 43,942	$ 44,067