Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Loans including fees:
Taxable	$ 228,480	$ 175,607	$ 198,940
Nontaxable	9,419	9,631	19,053
Investment securities, available-for-sale:
Taxable	51,682	71,057	90,087
Nontaxable	13,571	16,294	22,532
Investment securities, held-to-maturity, taxable	23,079	23,828	9,932
Money market and other interest-earning investments	362	431	133
Total interest income	326,593	296,848	340,677
Interest Expense
Deposits	35,911	48,608	67,628
Short-term borrowings	550	662	1,410
Other borrowings	17,259	29,162	40,240
Total interest expense	53,720	78,432	109,278
Net interest income	272,873	218,416	231,399
Provision for loan losses	7,473	30,781	63,280
Net interest income after provision for loan losses	265,400	187,635	168,119
Noninterest Income
Wealth management fees	20,460	16,120	15,963
Service charges on deposit accounts	51,862	50,018	55,196
ATM fees	25,199	22,967	20,472
Mortgage banking revenue	3,250	2,230	6,238
Insurance premiums and commissions	36,957	36,463	37,851
Investment product fees	11,068	9,192	8,515
Company-owned life insurance	5,322	4,052	2,355
Net securities gains	8,691	17,124	27,251
Total other-than-temporary impairment losses	(3,252)	(5,060)	(68,090)
Loss recognized in other comprehensive income	1,843	1,133	43,295
Impairment losses recognized in earnings	(1,409)	(3,927)	(24,795)
Gain on derivatives	974	1,492	719
Gain on sale leaseback transactions	7,864	6,452	6,301
Change in FDIC indemnification asset	426	0	0
Other income	12,219	7,967	7,394
Total noninterest income	182,883	170,150	163,460
Noninterest Expense
Salaries and employee benefits	189,539	170,601	181,368
Occupancy	51,054	46,410	47,064
Equipment	11,720	10,641	10,440
Marketing	5,990	5,720	9,578
Data processing	22,971	21,409	20,700
Communication	10,406	9,803	10,922
Professional fees	14,959	8,253	9,491
Loan expense	4,734	3,936	4,335
Supplies	3,762	2,935	4,294
Loss on extinguishment of debt	789	6,107	3,941
FDIC assessment	7,523	8,370	12,447
Amortization of intangibles	8,829	6,130	5,988
Other expense	16,245	13,990	18,388
Total noninterest expense	348,521	314,305	338,956
Income (loss) before income taxes	99,762	43,480	(7,377)
Income tax expense (benefit)	27,302	5,266	(21,114)
Net income	72,460	38,214	13,737
Preferred stock dividends and discount accretion	0	0	(3,892)
Net income available to common stockholders	$ 72,460	$ 38,214	$ 9,845
Net income per common share:
Basic earnings per share	$ 0.76	$ 0.44	$ 0.14
Diluted earnings per share	$ 0.76	$ 0.44	$ 0.14
Weighted average number of common shares outstanding
Basic	94,467	86,785	71,314
Diluted	94,772	86,928	71,367
Dividends per common share	$ 0.28	$ 0.28	$ 0.44