GOODWILL AND OTHER INTANGIBLE ASSETS, NET - Additional Information (Detail) - USD ($)		3 Months Ended
	Aug. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 37,144,000		$ 37,144,000
Goodwill write-off	$ 0
Aggregate amortization expense		1,090,000	$ 1,322,000
Mortgage Banking
Finite-Lived Intangible Assets [Line Items]
Goodwill write-off		2,100,000
Trade name intangibles
Finite-Lived Intangible Assets [Line Items]
Intangible asset write-off		$ 90,000
Core deposit intangibles
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period		5 years 8 months 12 days
Core deposit intangibles | Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization period of other intangible assets		4 years
Core deposit intangibles | Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization period of other intangible assets		10 years
Customer relationship intangible
Finite-Lived Intangible Assets [Line Items]
Intangible asset write-off		$ 246,000