LOANS AND LEASES (Acquired loan portfolio) (Detail) $ in Thousands	Jan. 01, 2018 USD ($)
Loans and Leases [Abstract]
Gross amortized cost basis at January 1, 2018	$ 1,697,760
Interest rate fair value adjustment	15,591
Credit fair value adjustment on pools of homogeneous loans	(22,421)
Credit fair value adjustment on purchased credit impaired loans	(10,652)
Fair value of acquired loan portfolio	$ 1,680,278