GOODWILL AND OTHER INTANGIBLE ASSETS, NET - Other Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Net Carrying Value	$ 10,219
Trade name intangibles
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets		$ 90
Core deposit intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	30,904	30,904
Accumulated Amortization	20,685	17,656
Net Carrying Value	$ 10,219	13,248
Customer relationship intangible
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		670
Accumulated Amortization		391
Net Carrying Value		$ 279