Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Interest Income:
Interest and fees on loans and leases	$ 135,694	$ 125,771	$ 266,417	$ 249,781
Taxable interest and dividends on securities	46,857	47,252	94,509	96,093
Non-taxable interest on securities	3,987	4,259	8,014	9,010
Loans held for sale	432	215	942	392
Total interest income	186,970	177,497	369,882	355,276
Interest Expense:
Deposits	11,533	10,851	23,075	21,495
Securities sold under agreements to repurchase and other borrowings	4,186	5,082	8,573	10,287
Federal Home Loan Bank advances	5,329	4,002	10,150	7,849
Long-term debt	2,411	2,440	4,809	5,222
Total interest expense	23,459	22,375	46,607	44,853
Net interest income	163,511	155,122	323,275	310,423
Provision for loan and lease losses	12,750	9,250	22,500	18,250
Net interest income after provision for loan and lease losses	150,761	145,872	300,775	292,173
Non-interest Income:
Deposit service fees	34,493	26,302	67,118	51,014
Loan related fees	5,729	4,890	11,408	9,372
Wealth and investment services	8,784	8,829	16,673	17,667
Mortgage banking activities	2,517	513	4,078	1,288
Increase in cash surrender value of life insurance policies	3,197	3,296	6,349	6,554
Gain on sale of investment securities	486	0	529	4,336
Impairment loss recognized in earnings	0	(73)	0	(161)
Other income	4,645	3,839	11,586	7,354
Total non-interest income	59,851	47,596	117,741	97,424
Non-interest Expense:
Compensation and benefits	74,043	65,711	144,907	132,082
Occupancy	11,680	11,491	25,276	24,250
Technology and equipment	20,224	15,737	39,472	30,747
Intangible assets amortization	1,843	669	3,131	1,837
Marketing	4,245	4,249	8,421	7,429
Professional and outside services	2,875	1,269	5,328	3,971
Deposit insurance	5,492	5,565	11,733	10,876
Other expense	17,044	17,784	33,268	35,746
Total non-interest expense	137,446	122,475	271,536	246,938
Income before income tax expense	73,166	70,993	146,980	142,659
Income tax expense	20,663	23,159	44,755	44,396
Net income	52,503	47,834	102,225	98,263
Preferred stock dividends	(2,024)	(2,639)	(4,663)	(5,278)
Net income available to common shareholders	$ 50,479	$ 45,195	$ 97,562	$ 92,985
Net income per common share:
Basic (in dollars per share)	$ 0.55	$ 0.50	$ 1.07	$ 1.03
Diluted (in dollars per share)	$ 0.55	$ 0.50	$ 1.07	$ 1.02