LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Carrying Amount of Purchased Credit Impaired Loans and Leases (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]
Outstanding Balance	$ 700,147	$ 781,103
Carrying Amount	642,367	712,731
Commercial | Commercial and industrial
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]
Outstanding Balance	5,088	1,001
Carrying Amount	4,796	853
Commercial | Commercial real estate
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]
Outstanding Balance	3,531	11,255
Carrying Amount	2,418	9,599
Commercial | SBA
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]
Outstanding Balance	3,839	4,033
Carrying Amount	2,760	3,049
Consumer | Single family residential mortgage
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]
Outstanding Balance	687,689	764,814
Carrying Amount	$ 632,393	$ 699,230