Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Interest income
Loans and leases	$ 211,763	$ 238,137
Investment securities:
U. S. Treasury	496	739
Government agency	3,326	4,332
Residential mortgage-backed securities	4,579	1,889
Corporate bonds	0	1,199
State, county and municipal	6	12
Other	77	131
Total investment securities interest and dividend income	8,484	8,302
Overnight investments	357	313
Total interest income	220,604	246,752
Interest expense
Deposits	10,313	16,472
Short-term borrowings	704	1,391
Long-term obligations	4,705	7,937
Total interest expense	15,722	25,800
Net interest income	204,882	220,952
Provision for loan and lease losses	(18,606)	30,715
Net interest income after provision for loan and lease losses	223,488	190,237
Noninterest income
Cardholder and merchant services	23,557	22,450
Service charges on deposit accounts	14,999	14,846
Wealth management services	14,515	13,755
Fees from processing services	5,619	8,562
Securities gains (losses)	58	(45)
Other service charges and fees	3,766	3,441
Mortgage income	3,788	2,924
Insurance commissions	2,980	2,756
ATM income	1,168	1,455
Adjustments for FDIC receivable for loss share agreements	(24,053)	(26,796)
Other	11,116	3,595
Total noninterest income	57,513	46,943
Noninterest expense
Salaries and wages	76,119	75,684
Employee benefits	25,019	20,249
Occupancy expense	18,809	18,607
Equipment expense	18,946	18,166
FDIC insurance expense	2,666	3,057
Foreclosure-related expenses	4,305	4,590
Other	48,491	42,978
Total noninterest expense	194,355	183,331
Income before income taxes	86,646	53,849
Income taxes	31,061	18,354
Net income	$ 55,585	$ 35,495
Average shares outstanding (in shares)	9,618,985	10,283,842
Net income per share (in dollars per share)	$ 5.78	$ 3.45