Consolidated Statements Of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest income
Interest and fees on loans	$ 212,709	$ 178,530	$ 412,023	$ 351,657
Interest bearing deposits with banks	1,634	793	3,257	1,539
Federal funds sold and securities purchased under resale agreements	1	1	2	2
Investment securities	15,524	16,398	29,097	33,588
Trading account securities	4	14	15	25
Federal Home Loan Bank and Federal Reserve Bank stock	1,153	1,112	2,223	2,049
Brokerage customer receivables	156	216	323	435
Total interest income	231,181	197,064	446,940	389,295
Interest expense
Interest on deposits	18,471	13,594	34,741	26,375
Interest on Federal Home Loan Bank advances	2,933	2,984	4,523	5,870
Interest on other borrowings	1,149	1,086	2,288	2,144
Interest on subordinated notes	1,786	1,777	3,558	3,554
Interest on junior subordinated debentures	2,433	2,353	4,841	4,573
Total interest expense	26,772	21,794	49,951	42,516
Net interest income	204,409	175,270	396,989	346,779
Provision for credit losses	8,891	9,129	14,100	17,163
Net interest income after provision for credit losses	195,518	166,141	382,889	329,616
Non-interest income
Wealth management	19,905	18,852	40,053	37,172
Mortgage banking	35,939	36,807	57,877	58,542
Service charges on deposit accounts	8,696	7,726	16,961	15,132
Gains (losses) on investment securities, net	47	1,440	(8)	2,765
Fees from covered call options	890	4,649	1,649	6,361
Trading losses, net	(420)	(316)	(740)	(484)
Operating lease income, net	6,805	4,005	12,587	6,811
Other	18,110	11,636	30,358	27,252
Total non-interest income	89,972	84,799	158,737	153,551
Non-interest expense
Salaries and employee benefits	106,502	100,894	205,818	196,705
Equipment	9,909	9,307	18,911	18,074
Operating lease equipment depreciation	5,662	3,385	10,298	5,435
Occupancy, net	12,586	11,943	25,687	23,891
Data processing	7,804	7,138	15,729	13,657
Advertising and marketing	8,726	6,941	13,876	10,720
Professional fees	7,510	5,419	12,170	9,478
Amortization of other intangible assets	1,141	1,248	2,305	2,546
FDIC insurance	3,874	4,040	8,030	7,653
OREO expense, net	739	1,348	2,404	1,908
Other	19,091	19,306	36,434	34,632
Total non-interest expense	183,544	170,969	351,662	324,699
Income before taxes	101,946	79,971	189,964	158,468
Income tax expense	37,049	29,930	66,689	59,316
Net income	64,897	50,041	123,275	99,152
Preferred stock dividends	2,050	3,628	5,678	7,256
Net income applicable to common shares	$ 62,847	$ 46,413	$ 117,597	$ 91,896
Net income per common share-Basic (usd per share)	$ 1.15	$ 0.94	$ 2.20	$ 1.88
Net income per common share-Diluted (usd per share)	1.11	0.90	2.11	1.80
Cash dividends declared per common share (usd per share)	$ 0.14	$ 0.12	$ 0.28	$ 0.24
Weighted average common shares outstanding	54,775	49,140	53,528	48,794
Dilutive potential common shares	1,812	3,965	2,981	3,887
Average common shares and dilutive common shares	56,587	53,105	56,509	52,681