Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Interest Income:
Interest and fees on loans and leases	$ 121,720	$ 121,379	$ 242,781	$ 242,120
Taxable interest and dividends on securities	42,197	45,662	84,454	91,550
Non-taxable interest on securities	5,625	6,935	11,753	13,915
Loans held for sale	551	657	1,188	1,155
Total interest income	170,093	174,633	340,176	348,740
Interest Expense:
Deposits	12,024	15,102	24,874	31,158
Securities sold under agreements to repurchase and other borrowings	5,184	5,360	10,239	9,794
Federal Home Loan Bank advances	4,007	4,426	8,546	8,990
Long-term debt	1,817	5,367	3,660	11,052
Total interest expense	23,032	30,255	47,319	60,994
Net interest income	147,061	144,378	292,857	287,746
Provision for loan and lease losses	8,500	5,000	16,000	9,000
Net interest income after provision for loan and lease losses	138,561	139,378	276,857	278,746
Non-interest Income:
Deposit service fees	24,622	23,719	48,616	47,082
Loan related fees	5,505	3,565	10,090	8,434
Wealth and investment services	8,920	7,249	16,686	14,470
Mortgage banking activities	5,888	3,624	12,919	8,007
Increase in cash surrender value of life insurance policies	3,448	2,561	6,832	5,078
Net gain on sale of investment securities	333	2,537	439	2,537
Other income	3,535	4,098	4,947	5,731
Total non-interest income	52,251	47,353	100,529	91,339
Non-interest Expense:
Compensation and benefits	65,768	63,587	131,818	132,206
Occupancy	11,837	12,578	24,716	25,460
Technology and equipment	15,495	16,021	30,848	31,603
Intangible assets amortization	1,242	1,397	2,484	2,794
Marketing	3,817	5,094	8,628	9,194
Professional and outside services	1,527	3,387	3,677	6,079
Deposit insurance	5,524	5,723	10,698	11,432
Other expense	18,394	19,392	36,270	36,224
Total non-interest expense	123,604	127,179	249,139	254,992
Income before income tax expense	67,208	59,552	128,247	115,093
Income tax expense	20,835	18,312	39,757	34,915
Net income	46,373	41,240	88,490	80,178
Preferred stock dividends	(2,639)	(615)	(5,525)	(1,230)
Net income available to common shareholders	$ 43,734	$ 40,625	$ 82,965	$ 78,948
Net income per common share:
Baisc (in dollars per share)	$ 0.49	$ 0.46	$ 0.94	$ 0.90
Diluted (in dollars per share)	$ 0.48	$ 0.44	$ 0.92	$ 0.86