GOODWILL AND OTHER INTANGIBLES - Gross Amount and Accumulated Amortization of Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Finite Lived Intangible Assets [Line Items]
Gross amount	$ 24,500
Core Deposits [Member]
Finite Lived Intangible Assets [Line Items]
Gross amount	45,844	45,844
Accumulated amortization	(38,274)	(36,509)
Net carrying amount	7,570	9,335
Remaining amortization period	9 years 6 months 0 days	10 years 4 months 24 days
Purchased Credit Card Relationship Intangible [Member]
Finite Lived Intangible Assets [Line Items]
Gross amount	24,465	24,465
Accumulated amortization	(3,747)	(954)
Net carrying amount	$ 20,718	$ 23,511
Remaining amortization period	8 years 2 months 12 days	9 years 0 months 0 days