GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 50,345	$ 49,767
Accumulated Amortization	(37,553)	(34,259)
Net Carrying Amount	12,792	15,508
Estimated aggregate amortization expense [Abstract]
Oct - Dec 2014	993
2015	3,408
2016	2,612
2017	1,908
2018	1,424
Thereafter	2,447
Net Carrying Amount	12,792	15,508
Components of goodwill [Abstract]
Goodwill	379,998	379,815
Goodwill, Activity	183
Accumulated impairment	(4,824)	(4,824)
Accumulated impairment, Activity	0
Goodwill, net	375,174	374,991	369,703
Goodwill, net, Activity	183
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	40,326	40,326
Accumulated Amortization	(29,510)	(26,866)
Net Carrying Amount	10,816	13,460
Estimated aggregate amortization expense [Abstract]
Net Carrying Amount	10,816	13,460
Other Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,019	9,441
Accumulated Amortization	(8,043)	(7,393)
Net Carrying Amount	1,976	2,048
Estimated aggregate amortization expense [Abstract]
Net Carrying Amount	$ 1,976	$ 2,048