CREDIT QUALITY ASSESSMENT (Summary Information on Allowance for Loan and Lease Loss Activity) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Credit Quality Assessment [Abstract]
Balance at beginning of year			$ 45,257	$ 44,067	$ 44,067
Provision for loan losses	$ 1,733	$ 1,322	3,730	1,516	2,977
Loan and lease charge-offs			(818)	(824)	(2,566)
Loan and lease recoveries			324	320	779
Net charge-offs			(494)	(504)	(1,787)
Balance at period end	$ 48,493	$ 45,079	$ 48,493	$ 45,079	$ 45,257