LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Carrying Amount of Purchased Credit Impaired Loans and Leases (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]
Outstanding Balance	$ 161,238	$ 164,280
Carrying Amount	139,699	141,826
Commercial | Commercial and industrial
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]
Outstanding Balance	4,974	5,029
Carrying Amount	4,687	4,760
Commercial | Commercial real estate
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]
Outstanding Balance	1,592	1,613
Carrying Amount	1,152	1,182
Commercial | SBA
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]
Outstanding Balance	3,733	3,771
Carrying Amount	2,607	2,672
Consumer | Single family residential mortgage
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]
Outstanding Balance	150,939	153,867
Carrying Amount	$ 131,253	$ 133,212