Consolidated Statements Of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest income
Interest and fees on loans	$ 271,134	$ 223,897	$ 761,191	$ 628,876
Mortgage loans held-for-sale	5,285	3,223	12,329	10,267
Interest bearing deposits with banks	5,423	3,272	11,462	6,529
Federal funds sold and securities purchased under resale agreements	0	0	1	2
Investment securities	21,710	16,058	60,726	45,155
Trading account securities	11	8	29	23
Federal Home Loan Bank and Federal Reserve Bank stock	1,235	1,080	3,988	3,303
Brokerage customer receivables	164	150	488	473
Total interest income	304,962	247,688	850,214	694,628
Interest expense
Interest on deposits	48,736	23,655	110,578	58,396
Interest on Federal Home Loan Bank advances	1,947	2,151	9,849	6,674
Interest on other borrowings	2,003	1,482	5,400	3,770
Interest on subordinated notes	1,773	1,772	5,333	5,330
Interest on junior subordinated debentures	2,940	2,640	8,239	7,481
Total interest expense	57,399	31,700	139,399	81,651
Net interest income	247,563	215,988	710,815	612,977
Provision for credit losses	11,042	7,896	24,431	21,996
Net interest income after provision for credit losses	236,521	208,092	686,384	590,981
Non-interest income
Wealth management	22,634	19,803	68,237	59,856
Mortgage banking	42,014	28,184	112,808	86,061
Gains (losses) on investment securities, net	90	39	(249)	31
Fees from covered call options	627	1,143	2,893	2,792
Trading (losses) gains, net	(61)	(129)	166	(869)
Operating lease income, net	9,132	8,461	27,569	21,048
Other	16,163	13,585	42,079	43,943
Total non-interest income	99,930	79,731	280,842	238,468
Non-interest expense
Salaries and employee benefits	123,855	106,251	357,966	312,069
Equipment	10,827	9,947	31,426	28,858
Operating lease equipment depreciation	7,370	6,794	20,843	17,092
Occupancy, net	14,404	13,079	41,834	38,766
Data processing	9,335	7,851	26,580	23,580
Advertising and marketing	11,120	9,572	31,726	23,448
Professional fees	9,914	6,786	23,047	18,956
Amortization of other intangible assets	1,163	1,068	3,164	3,373
FDIC insurance	4,205	3,877	13,165	11,907
OREO expense, net	596	590	4,502	2,994
Other	20,848	17,760	60,502	54,194
Total non-interest expense	213,637	183,575	614,755	535,237
Income before taxes	122,814	104,248	352,471	294,212
Income tax expense	30,866	38,622	88,962	105,311
Net income	91,948	65,626	263,509	188,901
Preferred stock dividends	2,050	2,050	6,150	7,728
Net income applicable to common shares	$ 89,898	$ 63,576	$ 257,359	$ 181,173
Net income per common share-Basic (usd per share)	$ 1.59	$ 1.14	$ 4.57	$ 3.34
Net income per common share-Diluted (usd per share)	1.57	1.12	4.50	3.23
Cash dividends declared per common share (usd per share)	$ 0.19	$ 0.14	$ 0.57	$ 0.42
Weighted average common shares outstanding (in shares)	56,366	55,796	56,268	54,292
Dilutive potential common shares (in shares)	918	966	912	2,305
Average common shares and dilutive common shares (in shares)	57,284	56,762	57,180	56,597
Service charges on deposit accounts
Non-interest income
Non-interest income	$ 9,331	$ 8,645	$ 27,339	$ 25,606