GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 47,617	$ 48,390
Accumulated Amortization	(32,505)	(30,959)
Net Carrying Amount	15,112	17,431
Finite-lived intangible assets, future amortization expense [Abstract]
Jul - Dec 2013	2,122
2014	3,597
2015	2,804
2016	2,094
2017	1,478
Thereafter	3,017
Net Carrying Amount	15,112	17,431
Components of goodwill [Abstract]
Goodwill	374,527	374,527
Goodwill, Activity	0
Accumulated Impairment	(4,824)	(4,824)
Accumulated impairment, Activity	0
Goodwill, net	369,703	369,703	345,050
Goodwill, net, Activity	0
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	38,185	38,958
Accumulated Amortization	(25,538)	(24,466)
Net Carrying Amount	12,647	14,492
Finite-lived intangible assets, future amortization expense [Abstract]
Net Carrying Amount	12,647	14,492
Other Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	9,432	9,432
Accumulated Amortization	(6,967)	(6,493)
Net Carrying Amount	2,465	2,939
Finite-lived intangible assets, future amortization expense [Abstract]
Net Carrying Amount	$ 2,465	$ 2,939