CREDIT QUALITY ASSESSMENT (Summary Information on Allowance for Loan and Lease Loss Activity) (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Credit Quality Assessment [Abstract]
Balance at beginning of year	$ 53,486	$ 45,257	$ 45,257
Provision (credit) for loan losses	(128)	1,997	9,023
Loan charge-offs	(356)	(477)	(1,416)
Loan recoveries	87	154	622
Net charge-offs	(269)	(323)	(794)
Balance at period end	$ 53,089	$ 46,931	$ 53,486