SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Results of Operations [Abstract]
Net interest revenue	$ 398,949	$ 414,591	$ 434,913
Provision for credit losses	7,500	28,000	130,081
Net interest revenue, after provision for credit losses	391,449	386,591	304,832
Noninterest revenue	275,066	280,149	270,845
Noninterest expense	534,849	549,193	533,633
Income before income taxes	131,666	117,547	42,044
Income tax expense (benefit)	37,551	33,252	4,475
Net Income	94,115	84,295	37,569
Selected Financial Information [Abstract]
Total assets at end of period	13,029,733	13,397,198	12,995,851
Depreciation and amortization	29,523	30,942	32,214
Community Banking [Member]
Results of Operations [Abstract]
Net interest revenue	372,629	389,466	407,648
Provision for credit losses	5,824	25,482	127,794
Net interest revenue, after provision for credit losses	366,805	363,984	279,854
Noninterest revenue	108,507	113,613	126,807
Noninterest expense	324,513	351,378	338,125
Income before income taxes	150,799	126,219	68,536
Income tax expense (benefit)	47,454	39,777	40,454
Net Income	103,345	86,442	28,082
Selected Financial Information [Abstract]
Total assets at end of period	9,809,428	10,232,036	10,169,986
Depreciation and amortization	22,912	23,773	24,167
Insurance Agencies [Member]
Results of Operations [Abstract]
Net interest revenue	165	270	329
Net interest revenue, after provision for credit losses	165	270	329
Noninterest revenue	99,103	90,045	86,955
Noninterest expense	86,557	78,799	73,793
Income before income taxes	12,711	11,516	13,491
Income tax expense (benefit)	5,175	4,682	5,423
Net Income	7,536	6,834	8,068
Selected Financial Information [Abstract]
Total assets at end of period	187,424	173,832	163,995
Depreciation and amortization	3,655	3,616	3,826
General Corporate and Other [Member]
Results of Operations [Abstract]
Net interest revenue	26,155	24,855	26,936
Provision for credit losses	1,676	2,518	2,287
Net interest revenue, after provision for credit losses	24,479	22,337	24,649
Noninterest revenue	67,456	76,491	57,083
Noninterest expense	123,779	119,016	121,715
Income before income taxes	(31,844)	(20,188)	(39,983)
Income tax expense (benefit)	(15,078)	(11,207)	(41,402)
Net Income	(16,766)	(8,981)	1,419
Selected Financial Information [Abstract]
Total assets at end of period	3,032,881	2,991,330	2,661,870
Depreciation and amortization	$ 2,956	$ 3,553	$ 4,221