GOODWILL AND OTHER INTANGIBLES - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Jun. 30, 2012
Finite Lived Intangible Assets [Line Items]
Goodwill	$ 28,100		$ 28,100
Purchase credit card relationship intangible amount				$ 24,500
Amortization expense	1,214	$ 1,093
Business Combination Finite Lived Intangible Assets Net	4,900
Purchased Credit Card Relationship Intangible [Member]
Finite Lived Intangible Assets [Line Items]
Purchase credit card relationship intangible amount	$ 24,465		$ 24,465
Amortization period of purchased credit card relationship intangible	5 years 7 months 6 days		5 years 9 months 18 days
Amortization expense	$ 700	800
Core Deposits [Member]
Finite Lived Intangible Assets [Line Items]
Purchase credit card relationship intangible amount	$ 51,664		$ 45,844
Amortization period of purchased credit card relationship intangible	8 years 9 months 18 days		9 years
Amortization expense	$ 500	$ 300
Customer Related Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Purchase credit card relationship intangible amount	$ 1,067		$ 0
Amortization period of purchased credit card relationship intangible	6 years 9 months 18 days
Amortization expense	$ 25