Consolidated Statements Of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest income
Loans and leases	$ 967,601	$ 967,737	$ 914,545
Investment securities:
U. S. Treasury	2,471	8,248	24,569
Government agency	15,688	19,848	12,341
Residential mortgage-backed securities	14,388	9,235	6,544
Corporate bonds	2,574	7,975	8,721
State, county and municipal	36	174	75
Other	340	548	227
Total investment securities interest and dividend income	35,497	46,028	52,477
Overnight investments	1,738	1,394	2,346
Total interest income	1,004,836	1,015,159	969,368
Interest expense
Deposits	57,568	101,888	149,195
Short-term borrowings	5,107	5,993	5,189
Long-term obligations	27,473	36,311	40,741
Total interest expense	90,148	144,192	195,125
Net interest income (loss)	914,688	870,967	774,243
Provision for loan and lease losses	142,885	232,277	143,519
Net interest income after provision for loan and lease losses	771,803	638,690	630,724
Noninterest income
Gain on acquisitions	0	150,417	136,000
Cardholder and merchant services	95,472	110,822	107,575
Service charges on deposit accounts	61,564	63,775	73,762
Wealth management services	57,236	54,974	51,378
Fees from processing services	34,816	30,487	29,097
Mortgage income	11,268	12,214	9,699
Insurance commissions	9,974	9,165	8,650
ATM income	5,279	6,020	6,656
Other service charges and fees	14,239	22,647	20,820
Securities gains (losses)	2,277	(288)	1,952
Adjustments for FDIC receivable for loss share agreements	(101,594)	(19,305)	(46,806)
Other	(1,231)	23,438	7,431
Total noninterest income	189,300	464,366	406,214
Noninterest expense
Salaries and wages	307,331	308,088	297,897
Employee benefits	78,861	72,526	64,733
Occupancy, net	74,798	74,832	72,766
Equipment	74,822	69,951	66,894
FDIC deposit insurance	10,656	16,459	23,167
Foreclosure-related expenses	40,654	46,133	20,439
Other	179,811	204,936	187,480
Total noninterest expense	766,933	792,925	733,376
Income before income taxes	194,170	310,131	303,562
Income taxes	59,822	115,103	110,518
Net income	$ 134,348	$ 195,028	$ 193,044
PER SHARE INFORMATION
Net income per share (in dollars per share)	$ 13.11	$ 18.80	$ 18.50
Dividends declared per share (in dollars per share)	$ 1.20	$ 1.20	$ 1.20
Average shares outstanding (in shares)	10,244,472	10,376,445	10,434,453