Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Interest income
Loans and leases	$ 226,812	$ 240,493	$ 696,813	$ 705,677
Investment securities:
U. S. Treasury	559	1,707	1,968	7,176
Government agency	3,692	5,162	12,401	15,072
Residential mortgage-backed securities	4,792	2,366	8,883	7,123
Corporate bonds	278	1,971	2,319	6,266
State, county and municipal	6	108	30	133
Other	108	21	301	480
Total investment securities interest and dividend income	9,435	11,335	25,902	36,250
Overnight investments	427	351	1,230	1,056
Total interest income	236,674	252,179	723,945	742,983
Interest expense
Deposits	13,850	24,825	45,369	81,726
Short-term borrowings	1,114	1,470	4,089	4,649
Long-term obligations	6,354	8,697	22,747	28,059
Total interest expense	21,318	34,992	72,205	114,434
Net interest income	215,356	217,187	651,740	628,549
Provision for loan and lease losses	17,623	44,628	78,005	143,024
Net interest income after provision for loan and lease losses	197,733	172,559	573,735	485,525
Noninterest income
Gain on acquisitions	0	86,943	0	150,417
Cardholder and merchant services	24,725	30,801	71,872	88,124
Service charges on deposit accounts	15,549	16,389	45,456	47,957
Wealth management services	14,129	14,011	42,414	41,418
Fees from processing services	9,521	7,883	25,640	22,724
Securities gains (losses)	31	254	(11)	(291)
Other service charges and fees	3,377	6,256	10,392	18,173
Mortgage income	2,335	3,994	7,183	8,839
Insurance commissions	2,568	2,196	7,562	7,010
ATM income	1,263	1,453	3,999	4,413
Adjustments for FDIC receivable for loss share agreements	(16,858)	(18,893)	(57,788)	(43,019)
Other	(4,798)	11,612	(638)	13,363
Total noninterest income	51,842	162,899	156,081	359,128
Noninterest expense
Salaries and wages	76,675	77,877	229,145	229,805
Employee benefits	18,741	17,153	59,548	55,510
Occupancy expense	18,860	18,538	55,467	55,338
Equipment expense	17,983	17,478	54,147	52,384
FDIC insurance expense	2,016	2,768	7,739	13,494
Foreclosure-related expenses	8,667	14,558	29,053	23,793
Other	47,135	55,460	133,106	151,018
Total noninterest expense	190,077	203,832	568,205	581,342
Income before income taxes	59,498	131,626	161,611	263,311
Income taxes	19,974	50,205	49,009	98,830
Net income	$ 39,524	$ 81,421	$ 112,602	$ 164,481
Average shares outstanding (in shares)	10,264,159	10,363,964	10,273,082	10,406,833
Net income per share (in dollars per share)	$ 3.85	$ 7.86	$ 10.96	$ 15.81