LOANS AND LEASES (Additional Information) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Loans and Leases [Abstract]
Unearned income and deferred fees	$ 800		$ 1,800
Loans receivable with a gross amortized cost basis		$ 1,697,760
Credit fair value adjustment on purchased credit impaired loans		10,652
Certain Loans Acquired In Transfer Accretable Yield		2,616
Credit Impaired Loans Acquired In Transfer Nonaccretable Difference		8,100
Outstanding balance of purchased credit impaired loans receivable	28,300	28,800
Fair value of purchase credit impaired loans	18,900	$ 18,193
Increase in goodwill from re-measurement period adjustment	$ 3,400