Consolidated Statements Of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest income
Interest and fees on loans	$ 227,120	$ 190,189	$ 639,143	$ 541,846
Interest bearing deposits with banks	3,272	1,156	6,529	2,695
Federal funds sold and securities purchased under resale agreements	0	1	2	3
Investment securities	16,058	15,496	45,155	49,084
Trading account securities	8	18	23	43
Federal Home Loan Bank and Federal Reserve Bank stock	1,080	1,094	3,303	3,143
Brokerage customer receivables	150	195	473	630
Total interest income	247,688	208,149	694,628	597,444
Interest expense
Interest on deposits	23,655	15,621	58,396	41,996
Interest on Federal Home Loan Bank advances	2,151	2,577	6,674	8,447
Interest on other borrowings	1,482	1,137	3,770	3,281
Interest on subordinated notes	1,772	1,778	5,330	5,332
Interest on junior subordinated debentures	2,640	2,400	7,481	6,973
Total interest expense	31,700	23,513	81,651	66,029
Net interest income	215,988	184,636	612,977	531,415
Provision for credit losses	7,896	9,571	21,996	26,734
Net interest income after provision for credit losses	208,092	175,065	590,981	504,681
Non-interest income
Wealth management	19,803	19,334	59,856	56,506
Mortgage banking	28,184	34,712	86,061	93,254
Service charges on deposit accounts	8,645	8,024	25,606	23,156
Gains on investment securities, net	39	3,305	31	6,070
Fees from covered call options	1,143	3,633	2,792	9,994
Trading losses, net	(129)	(432)	(869)	(916)
Operating lease income, net	8,461	4,459	21,048	11,270
Other	13,585	13,569	43,943	40,821
Total non-interest income	79,731	86,604	238,468	240,155
Non-interest expense
Salaries and employee benefits	106,251	103,718	312,069	300,423
Equipment	9,947	9,449	28,858	27,523
Operating lease equipment depreciation	6,794	3,605	17,092	9,040
Occupancy, net	13,079	12,767	38,766	36,658
Data processing	7,851	7,432	23,580	21,089
Advertising and marketing	9,572	7,365	23,448	18,085
Professional fees	6,786	5,508	18,956	14,986
Amortization of other intangible assets	1,068	1,085	3,373	3,631
FDIC insurance	3,877	3,686	11,907	11,339
OREO expense, net	590	1,436	2,994	3,344
Other	17,760	20,564	54,194	55,196
Total non-interest expense	183,575	176,615	535,237	501,314
Income before taxes	104,248	85,054	294,212	243,522
Income tax expense	38,622	31,939	105,311	91,255
Net income	65,626	53,115	188,901	152,267
Preferred stock dividends	2,050	3,628	7,728	10,884
Net income applicable to common shares	$ 63,576	$ 49,487	$ 181,173	$ 141,383
Net income per common share-Basic (usd per share)	$ 1.14	$ 0.96	$ 3.34	$ 2.84
Net income per common share-Diluted (usd per share)	1.12	0.92	3.23	2.72
Cash dividends declared per common share (usd per share)	$ 0.14	$ 0.12	$ 0.42	$ 0.36
Weighted average common shares outstanding (in shares)	55,796	51,679	54,292	49,763
Dilutive potential common shares (in shares)	966	4,047	2,305	3,931
Average common shares and dilutive common shares (in shares)	56,762	55,726	56,597	53,694