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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Credit Quality Assessment [Abstract]
Balance at beginning of year			$ 53,486	$ 45,257	$ 45,257
Provision (credit) for loan losses	$ 1,524	$ 1,890	3,029	5,620	9,023
Loan charge-offs			(2,101)	(1,003)	(1,416)
Loan recoveries			578	535	622
Net charge-offs			(1,523)	(468)	(794)
Balance at period end	$ 54,992	$ 50,409	$ 54,992	$ 50,409	$ 53,486