Consolidated Statements Of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Interest income
Interest and fees on loans	$ 154,676	$ 147,030
Interest bearing deposits with banks	316	249
Federal funds sold and securities purchased under resale agreements	2	4
Available-for-sale securities	14,400	13,114
Trading account securities	13	9
Federal Home Loan Bank and Federal Reserve Bank stock	769	711
Brokerage customer receivables	181	209
Total interest income	170,357	161,326
Interest expense
Interest on deposits	11,814	11,923
Interest on Federal Home Loan Bank advances	2,156	2,643
Interest on other borrowings	788	750
Interest on subordinated notes	1,775	0
Interest on junior subordinated debentures	1,933	2,004
Total interest expense	18,466	17,320
Net interest income	151,891	144,006
Provision for credit losses	6,079	1,880
Net interest income after provision for credit losses	145,812	142,126
Non-interest income
Wealth management	18,100	16,813
Mortgage banking	27,800	16,428
Service charges on deposit accounts	6,297	5,346
Gains (losses) on available-for-sale securities, net	524	(33)
Fees from covered call options	4,360	1,542
Trading losses, net	(477)	(652)
Other	7,937	6,085
Total non-interest income	64,541	45,529
Non-interest expense
Salaries and employee benefits	90,130	79,934
Equipment	7,836	7,403
Occupancy, net	12,351	10,993
Data processing	5,448	4,715
Advertising and marketing	3,907	2,816
Professional fees	4,664	3,454
Amortization of other intangible assets	1,013	1,163
FDIC insurance	2,987	2,951
OREO expense, net	1,411	3,976
Other	17,571	13,910
Total non-interest expense	147,318	131,315
Income before taxes	63,035	56,340
Income tax expense	23,983	21,840
Net income	39,052	34,500
Preferred stock dividends and discount accretion	1,581	1,581
Net income applicable to common shares	$ 37,471	$ 32,919
Net income per common share-Basic (in usd per share)	$ 0.79	$ 0.71
Net income per common share-Diluted (in usd per share)	$ 0.76	$ 0.68
Cash dividends declared per common share (in usd per share)	$ 0.11	$ 0.10
Weighted average common shares outstanding	47,239	46,195
Dilutive potential common shares	4,233	4,509
Average common shares and dilutive common shares	51,472	50,704