Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010
Assets
Cash and due from banks	$ 194,606	$ 107,368	$ 129,169
Money market and other interest-earning investments	74,623	144,184	43,102
Total cash and cash equivalents	269,229	251,552	172,271
Trading securities - at fair value	2,794	0	0
Investment securities - available-for-sale, at fair value
Available-for-sale securities	2,253,089
Securities - available-for-sale, at fair value	2,253,089	1,960,222	2,190,804
Investment securities - held-to-maturity, at amortized cost (fair value $517,427, $625,643 and $770,688 respectively)	493,282	638,210	753,835
Federal Home Loan Bank stock, at cost	34,870	31,937	36,090
Residential loans held for sale, at fair value	4,710	3,819	3,512
Loans:
Commercial	1,246,289	1,211,399	1,266,893
Commercial real estate	1,128,374	942,395	981,524
Residential real estate	865,951	664,705	482,967
Consumer credit, net of unearned income	899,446	924,952	971,756
Covered loans, net of discount	711,266	0	0
Total loans	4,851,326	3,743,451	3,703,140
Allowance for loan losses	(65,219)	(72,309)	(72,149)
Allowance for loan losses- covered loans	(303)	0	0
Net loans	4,785,804	3,671,142	3,630,991
FDIC indemnification asset	168,091	0	0
Premises and equipment, net	75,257	48,775	50,057
Accrued interest receivable	43,713	42,971	44,376
Goodwill	265,985	167,884	167,884
Other intangible assets	36,298	26,178	27,681
Company-owned life insurance	247,234	226,192	225,985
Other real estate owned	9,390	5,591	5,886
Other real estate owned - covered	31,908	0	0
Other assets	211,046	189,419	196,742
Total assets	8,932,700	7,263,892	7,506,114
Liabilities
Noninterest-bearing demand	1,728,548	1,276,024	1,267,404
Interest-bearing:
NOW	1,517,117	1,297,443	1,163,610
Savings	1,624,786	1,079,376	1,046,011
Money market	306,089	334,825	344,297
Time	1,690,723	1,475,257	1,618,115
Total deposits	6,867,263	5,462,925	5,439,437
Short-term borrowings	341,004	298,232	367,761
Other borrowings	443,884	421,911	578,282
FDIC true-up liability	14,090	0	0
Accrued expenses and other liabilities	238,764	202,019	224,950
Total liabilities	7,905,005	6,385,087	6,610,430
Shareholders' Equity
Preferred stock, series A, 1,000 shares authorized, no shares issued or outstanding	0	0	0
Common stock, $1 stated value, 150,000 shares authorized,94,752, 87,183 and 87,172 shares issued and outstanding, respectively	94,752	87,183	87,172
Capital surplus	834,060	748,873	748,292
Retained earnings	74,312	44,018	44,404
Accumulated other comprehensive income (loss), net of tax	24,571	(1,269)	15,816
Total shareholders' equity	1,027,695	878,805	895,684
Total liabilities and shareholders' equity	8,932,700	7,263,892	7,506,114
U.S. Treasury [Member]
Investment securities - available-for-sale, at fair value
Available-for-sale securities	65,951	62,550	51,814
U.S. Government-Sponsored Entities And Agencies [Member]
Investment securities - available-for-sale, at fair value
Available-for-sale securities	180,934	315,133	538,148
Mortgage-Backed Securities - Agency [Member]
Investment securities - available-for-sale, at fair value
Available-for-sale securities	1,441,585	1,071,252	1,102,758
States And Political Subdivisions [Member]
Investment securities - available-for-sale, at fair value
Available-for-sale securities	391,202	348,924	336,993
Other Securities [Member]
Investment securities - available-for-sale, at fair value
Securities - available-for-sale, at fair value	$ 173,417	$ 162,363	$ 161,091