Consolidated Statements Of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest income
Interest and fees on loans	$ 314,277	$ 271,134	$ 920,425	$ 761,191
Mortgage loans held-for-sale	3,478	5,285	8,791	12,329
Interest bearing deposits with banks	10,326	5,423	20,832	11,462
Federal funds sold and securities purchased under resale agreements	310	0	310	1
Investment securities	24,758	21,710	80,435	60,726
Trading account securities	20	11	33	29
Federal Home Loan Bank and Federal Reserve Bank stock	1,294	1,235	4,088	3,988
Brokerage customer receivables	164	164	497	488
Total interest income	354,627	304,962	1,035,411	850,214
Interest expense
Interest on deposits	76,168	48,736	204,168	110,578
Interest on Federal Home Loan Bank advances	1,774	1,947	8,417	9,849
Interest on other borrowings	3,466	2,003	10,624	5,400
Interest on subordinated notes	5,470	1,773	10,051	5,333
Interest on junior subordinated debentures	2,897	2,940	9,111	8,239
Total interest expense	89,775	57,399	242,371	139,399
Net interest income	264,852	247,563	793,040	710,815
Provision for credit losses	10,834	11,042	46,038	24,431
Net interest income after provision for credit losses	254,018	236,521	747,002	686,384
Non-interest income
Wealth management	23,999	22,634	72,115	68,237
Mortgage banking	50,864	42,014	106,433	112,808
Service charges on deposit accounts	40,834	38,722	120,281	114,313
Gains (losses) on investment securities, net	710	90	2,938	(249)
Fees from covered call options	0	627	2,427	2,893
Trading gains (losses), net	11	(61)	(204)	166
Operating lease income, net	12,025	9,132	34,554	27,569
Other	17,556	16,163	48,592	42,079
Total non-interest income	115,137	99,930	294,952	280,842
Non-interest expense
Salaries and employee benefits	141,024	123,855	400,479	357,966
Equipment	13,314	10,827	37,843	31,426
Operating lease equipment depreciation	8,907	7,370	25,994	20,843
Occupancy, net	14,991	14,404	47,157	41,834
Data processing	6,522	9,335	20,251	26,580
Advertising and marketing	13,375	11,120	36,078	31,726
Professional fees	8,037	9,914	19,821	23,047
Amortization of other intangible assets	2,928	1,163	8,827	3,164
FDIC insurance	148	4,205	7,851	13,165
OREO expense, net	1,170	596	3,092	4,502
Other	24,138	20,848	71,142	60,502
Total non-interest expense	234,554	213,637	678,535	614,755
Income before taxes	134,601	122,814	363,419	352,471
Income tax expense	35,480	30,866	93,686	88,962
Net income	99,121	91,948	269,733	263,509
Preferred stock dividends	2,050	2,050	6,150	6,150
Net income applicable to common shares	$ 97,071	$ 89,898	$ 263,583	$ 257,359
Net income per common share-Basic (usd per share)	$ 1.71	$ 1.59	$ 4.65	$ 4.57
Net income per common share-Diluted (usd per share)	1.69	1.57	4.60	4.50
Cash dividends declared per common share (usd per share)	$ 0.25	$ 0.19	$ 0.75	$ 0.57
Weighted average common shares outstanding (in shares)	56,690	56,366	56,627	56,268
Dilutive potential common shares (in shares)	773	918	724	912
Average common shares and dilutive common shares (in shares)	57,463	57,284	57,351	57,180
Service charges on deposit accounts
Non-interest income
Service charges on deposit accounts	$ 9,972	$ 9,331	$ 28,097	$ 27,339