Consolidated Statements Of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Interest income
Interest and fees on loans	$ 167,831	$ 156,534	$ 482,330	$ 455,548
Interest bearing deposits with banks	372	409	993	977
Federal funds sold and securities purchased under resale agreements	1	12	4	22
Available-for-sale securities	16,130	12,767	44,601	39,190
Trading account securities	19	20	83	34
Federal Home Loan Bank and Federal Reserve Bank stock	821	733	2,375	2,171
Brokerage customer receivables	205	201	591	610
Total interest income	185,379	170,676	530,977	498,552
Interest expense
Interest on deposits	12,436	12,298	36,246	35,980
Interest on Federal Home Loan Bank advances	2,458	2,641	6,426	7,989
Interest on other borrowings	1,045	200	2,620	1,460
Interest on subordinated notes	1,776	1,776	5,328	2,130
Interest on junior subordinated debentures	2,124	2,091	6,034	6,137
Total interest expense	19,839	19,006	56,654	53,696
Net interest income	165,540	151,670	474,323	444,856
Provision for credit losses	8,322	5,864	23,883	14,404
Net interest income after provision for credit losses	157,218	145,806	450,440	430,452
Non-interest income
Wealth management	18,243	17,659	54,819	52,694
Mortgage banking	27,887	26,691	91,694	66,923
Service charges on deposit accounts	7,403	6,084	20,174	17,118
(Losses) gains on available-for-sale securities, net	(98)	(153)	402	(522)
Fees from covered call options	2,810	2,107	11,735	4,893
Trading (losses) gains, net	(135)	293	(452)	(1,102)
Other	8,843	5,271	28,135	17,579
Total non-interest income	64,953	57,952	206,507	157,583
Non-interest expense
Salaries and employee benefits	97,749	85,976	282,300	247,873
Equipment	8,887	7,570	24,637	22,196
Occupancy, net	12,066	10,446	35,818	31,289
Data processing	8,127	4,765	19,656	14,023
Advertising and marketing	6,237	3,528	16,550	9,902
Professional fees	4,100	4,035	13,838	11,535
Amortization of other intangible assets	1,350	1,202	3,297	3,521
FDIC insurance	3,035	3,211	9,069	9,358
OREO expense, net	(367)	581	1,885	7,047
Other	18,790	17,186	54,539	46,662
Total non-interest expense	159,974	138,500	461,589	403,406
Income before taxes	62,197	65,258	195,358	184,629
Income tax expense	23,842	25,034	74,120	71,364
Net income	38,355	40,224	121,238	113,265
Preferred stock dividends and discount accretion	4,079	1,581	7,240	4,743
Net income applicable to common shares	$ 34,276	$ 38,643	$ 113,998	$ 108,522
Net income per common share-Basic	$ 0.71	$ 0.83	$ 2.39	$ 2.34
Net income per common share-Diluted	0.69	0.79	2.29	2.23
Cash dividends declared per common share	$ 0.11	$ 0.10	$ 0.33	$ 0.30
Weighted average common shares outstanding	48,158	46,639	47,658	46,453
Dilutive potential common shares	4,049	4,241	4,141	4,349
Average common shares and dilutive common shares	52,207	50,880	51,799	50,802