SEGMENT REPORTING (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Results of Operations
Net interest revenue	$ 109,912	$ 109,329	$ 219,349	$ 221,211
Provision for credit losses	32,240	62,354	85,719	105,873
Net interest revenue after provision for credit losses	77,672	46,975	133,630	115,338
Noninterest revenue	75,144	57,086	143,455	120,418
Noninterest expense	137,069	120,016	267,079	240,499
Income (loss) before income taxes	15,747	(15,955)	10,006	(4,743)
Income tax expense (benefit)	2,921	(3,395)	(2,326)	(579)
Net income (loss)	12,826	(12,560)	12,332	(4,164)
Selected Financial Information
Total assets at end of period	13,367,050	13,421,004	13,367,050	13,421,004	13,615,010
Depreciation and amortization	8,148	8,346	16,476	16,904
Community Banking [Member]
Results of Operations
Net interest revenue	102,880	99,271	205,543	200,611
Provision for credit losses	32,534	58,789	85,775	100,738
Net interest revenue after provision for credit losses	70,346	40,482	119,768	99,873
Noninterest revenue	40,913	27,474	68,905	53,766
Noninterest expense	91,936	77,975	174,654	155,585
Income (loss) before income taxes	19,323	(10,019)	14,019	(1,946)
Income tax expense (benefit)	4,063	(2,132)	1,962	(238)
Net income (loss)	15,260	(7,887)	12,057	(1,708)
Selected Financial Information
Total assets at end of period	10,483,137	10,956,724	10,483,137	10,956,724
Depreciation and amortization	6,107	6,678	12,381	13,634
Insurance Agencies [Member]
Results of Operations
Net interest revenue	84	146	179	294
Provision for credit losses	0	0	0	0
Net interest revenue after provision for credit losses	84	146	179	294
Noninterest revenue	22,890	21,625	45,427	43,359
Noninterest expense	19,011	18,074	37,063	35,477
Income (loss) before income taxes	3,963	3,697	8,543	8,176
Income tax expense (benefit)	1,576	1,457	3,401	3,239
Net income (loss)	2,387	2,240	5,142	4,937
Selected Financial Information
Total assets at end of period	171,122	173,210	171,122	173,210
Depreciation and amortization	972	1,104	1,946	2,164
General Corporate and Other [Member]
Results of Operations
Net interest revenue	6,948	9,912	13,627	20,306
Provision for credit losses	(294)	3,565	(56)	5,135
Net interest revenue after provision for credit losses	7,242	6,347	13,683	15,171
Noninterest revenue	11,341	7,987	29,123	23,293
Noninterest expense	26,122	23,967	55,362	49,437
Income (loss) before income taxes	(7,539)	(9,633)	(12,556)	(10,973)
Income tax expense (benefit)	(2,718)	(2,720)	(7,689)	(3,580)
Net income (loss)	(4,821)	(6,913)	(4,867)	(7,393)
Selected Financial Information
Total assets at end of period	2,712,791	2,291,070	2,712,791	2,291,070
Depreciation and amortization	$ 1,069	$ 564	$ 2,149	$ 1,106