Consolidated Statements of Income - 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:
Loans, including fees	$ 194,180	$ 156,717	$ 366,961	$ 310,830
Loans held for sale	236	249	453	408
Securities-taxable	24,402	23,049	47,769	47,006
Securities-tax exempt	5,628	3,011	11,035	4,813
Short-term investments	1,731	480	2,474	1,090
Total interest income	226,177	183,506	428,692	364,147
Interest expense:
Deposits	18,364	12,603	31,183	24,336
Short-term borrowings	4,232	909	7,173	1,902
Long-term debt	3,864	5,025	8,928	10,104
Total interest expense	26,460	18,537	47,284	36,342
Net interest income	199,717	164,969	381,408	327,805
Provision for loan losses	14,951	17,196	30,942	77,232
Net interest income after provision for loan losses	184,766	147,773	350,466	250,573
Noninterest income:
Service charges on deposit accounts	20,061	18,394	39,267	36,777
Trust fees	11,506	12,089	22,717	23,313
Bank card and ATM fees	13,687	11,954	26,155	23,302
Investment and annuity fees	5,271	5,043	9,870	9,976
Secondary mortgage market operations	4,241	4,176	7,808	7,088
Insurance commissions and fees	1,174	1,240	1,839	2,547
Amortization of FDIC loss share receivable	(1,327)	(1,526)	(2,427)	(3,139)
Other income	12,874	11,556	25,749	20,902
Securities transactions		768		1,114
Total noninterest income	67,487	63,694	130,978	121,880
Noninterest expense:
Compensation expense	82,145	70,233	155,244	143,234
Employee benefits	15,500	14,004	31,520	29,718
Personnel expense	97,645	84,237	186,764	172,952
Net occupancy expense	13,080	10,394	23,837	20,750
Equipment expense	3,964	3,080	7,678	6,854
Data processing expense	16,798	14,370	32,195	28,577
Professional services expense	10,353	7,712	21,629	15,333
Amortization of intangibles	5,757	5,005	10,462	10,129
Telecommunications and postage	3,738	3,272	7,205	6,633
Deposit insurance and regulatory fees	6,983	6,049	13,473	11,446
Other real estate (income) expense, net	(2,515)	350	(2,528)	1,118
Other expense	27,667	16,473	46,297	33,182
Total noninterest expense	183,470	150,942	347,012	306,974
Income before income taxes	68,783	60,525	134,432	65,479
Income taxes	16,516	13,618	33,151	14,733
Net income	$ 52,267	$ 46,907	$ 101,281	$ 50,746
Earnings per common share-basic	$ 0.60	$ 0.59	$ 1.17	$ 0.64
Earnings per common share-diluted	0.60	0.59	1.17	0.64
Dividends paid per share	$ 0.24	$ 0.24	$ 0.48	$ 0.48
Weighted average shares outstanding-basic	84,614	77,523	84,489	77,512
Weighted average shares outstanding-diluted	84,867	77,680	84,755	77,676