CONSOLIDATED STATEMENTS OF INCOME (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest income:
Loans, including fees	$ 300,056	$ 261,971	$ 585,396	$ 511,319
Investment securities available for sale	23,884	20,266	47,812	40,099
Trading account assets	166	21	220	49
Mortgage loans held for sale	557	505	936	972
Federal Reserve Bank balances	2,818	1,304	4,568	2,515
Other earning assets	2,353	1,443	4,036	2,957
Total interest income	329,834	285,510	642,968	557,911
Interest expense:
Deposits	32,600	18,118	58,975	35,075
Federal funds purchased and securities sold under repurchase agreements	203	45	310	84
Long-term debt	12,454	16,250	24,822	31,728
Total interest expense	45,257	34,413	84,107	66,887
Net interest income	284,577	251,097	558,861	491,024
Provision for loan losses	11,790	10,260	24,566	18,934
Net interest income after provision for loan losses	272,787	240,837	534,295	472,090
Non-interest income:
Revenue from contract with customers	56,350	51,835	110,665	103,321
Income from bank-owned life insurance	3,733	3,272	7,949	6,328
Investment securities (losses) gains, net	(1,296)	(1)	(1,296)	7,667
Decrease in fair value of private equity investments, net	(37)	(1,352)	(3,093)	(3,166)
Other non-interest income	7,174	4,807	11,124	7,762
Total non-interest income	73,387	68,701	140,433	140,539
Non-interest expense:
Salaries and other personnel expense	111,863	105,213	225,583	212,404
Net occupancy and equipment expense	32,654	29,933	64,134	59,264
Third-party processing expense	15,067	13,620	29,012	26,223
FDIC insurance and other regulatory fees	6,543	6,875	13,335	13,645
Professional fees	6,284	7,551	11,789	12,907
Advertising expense	5,220	5,346	10,312	11,258
Valuation adjustment to Visa derivative	2,328	0	2,328	0
Foreclosed real estate expense, net	(107)	1,448	749	3,582
Earnout liability adjustment	0	1,707	0	1,707
Restructuring charges, net	103	13	(212)	6,524
Other operating expenses	24,102	20,041	42,204	41,619
Total non-interest expense	204,057	191,747	399,234	389,133
Income before income taxes	142,117	117,791	275,494	223,496
Income tax expense	30,936	41,788	61,146	75,635
Net income	111,181	76,003	214,348	147,861
Dividends on preferred stock	2,559	2,559	5,119	5,119
Net income available to common shareholders	$ 108,622	$ 73,444	$ 209,229	$ 142,742
Net income per common share, basic (in dollars per share)	$ 0.92	$ 0.60	$ 1.77	$ 1.17
Net income per common share, diluted (in dollars per share)	$ 0.91	$ 0.60	$ 1.75	$ 1.16
Weighted average common shares outstanding, basic (in shares)	118,397	122,203	118,531	122,251
Weighted average common shares outstanding, diluted (in shares)	119,139	123,027	119,229	123,043
Service charges on deposit accounts
Non-interest income:
Revenue from contract with customers	$ 19,999	$ 20,252	$ 39,938	$ 40,370
Fiduciary and asset management fees
Non-interest income:
Revenue from contract with customers	13,983	12,524	27,419	24,676
Card fees
Non-interest income:
Revenue from contract with customers	10,833	10,041	21,032	19,885
Brokerage revenue
Non-interest income:
Revenue from contract with customers	8,900	7,210	17,596	14,436
Mortgage banking income
Non-interest income:
Revenue from contract with customers	4,839	5,784	9,887	11,548
Other fee income
Non-interest income:
Revenue from contract with customers	$ 5,259	$ 6,164	$ 9,877	$ 11,033