GOODWILL AND OTHER INTANGIBLES - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Jun. 30, 2012
Finite Lived Intangible Assets [Line Items]
Goodwill	$ 28,100		$ 28,100		$ 28,100
Purchase credit card relationship intangible amount						$ 24,500
Amortization expense			3,669	$ 3,817
Business Combination Finite Lived Intangible Assets Net	4,600		4,600
Purchased Credit Card Relationship Intangible [Member]
Finite Lived Intangible Assets [Line Items]
Purchase credit card relationship intangible amount	$ 24,465		24,465		$ 24,465
Amortization period of purchased credit card relationship intangible	5 years 2 months 12 days				5 years 9 months 18 days
Amortization expense	$ 700	$ 800	2,100	2,300
Core Deposits [Member]
Finite Lived Intangible Assets [Line Items]
Purchase credit card relationship intangible amount	$ 51,664		51,664		$ 45,844
Amortization period of purchased credit card relationship intangible	8 years 3 months 18 days				9 years
Amortization expense	$ 500	$ 600	1,500	$ 1,500
Customer Related Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Purchase credit card relationship intangible amount	$ 1,067		1,067		$ 0
Amortization period of purchased credit card relationship intangible	6 years 3 months 18 days
Amortization expense	$ 38		$ 100