CREDIT QUALITY ASSESSMENT (Summary Information on Allowance for Loan and Lease Loss Activity) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Credit Quality Assessment [Abstract]
Balance at beginning of year				$ 53,486				$ 45,257	$ 53,486	$ 45,257	$ 44,067
Provision for loan losses	$ 1,655	$ 1,524	$ 1,633	$ (128)	$ 3,403	$ 1,890	$ 1,733	$ 1,997	4,684	9,023	2,977
Loan and lease charge-offs									(2,668)	(1,416)	(2,566)
Loan and lease recoveries									630	622	779
Net charge-offs									(2,038)	(794)	(1,787)
Balance at period end	$ 56,132				$ 53,486				$ 56,132	$ 53,486	$ 45,257