Consolidated Statements of Income - 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:
Loans, including fees	$ 199,702	$ 155,761	$ 566,663	$ 466,591
Loans held for sale	216	323	669	731
Securities-taxable	26,616	21,782	74,385	68,788
Securities-tax exempt	5,608	3,780	16,643	8,593
Short-term investments	574	507	3,048	1,597
Total interest income	232,716	182,153	661,408	546,300
Interest expense:
Deposits	21,789	12,590	52,972	36,926
Short-term borrowings	4,425	1,040	11,598	2,942
Long-term debt	3,645	5,010	12,573	15,114
Total interest expense	29,859	18,640	77,143	54,982
Net interest income	202,857	163,513	584,265	491,318
Provision for loan losses	13,040	18,972	43,982	96,204
Net interest income after provision for loan losses	189,817	144,541	540,283	395,114
Noninterest income:
Service charges on deposit accounts	21,444	18,716	60,711	55,493
Trust fees	10,742	11,512	33,459	34,825
Bank card and ATM fees	13,390	11,808	39,545	35,110
Investment and annuity fees	5,570	4,289	15,440	14,265
Secondary mortgage market operations	4,157	4,917	11,965	12,005
Insurance commissions and fees	660	1,088	2,499	3,635
Amortization of FDIC loss share receivable		(1,539)	(2,427)	(4,678)
Other income	11,152	11,866	36,901	32,768
Securities transactions		351		1,465
Total noninterest income	67,115	63,008	198,093	184,888
Noninterest expense:
Compensation expense	82,242	70,290	237,486	213,524
Employee benefits	12,499	12,873	44,019	42,591
Personnel expense	94,741	83,163	281,505	256,115
Net occupancy expense	12,448	10,068	36,285	30,818
Equipment expense	3,779	3,349	11,457	10,203
Data processing expense	16,798	14,590	48,993	43,167
Professional services expense	10,062	6,584	31,691	21,917
Amortization of intangibles	6,070	4,886	16,532	15,015
Telecommunications and postage	3,876	3,284	11,081	9,917
Deposit insurance and regulatory fees	7,883	5,969	21,356	17,415
Other real estate (income) expense, net	199	(5,214)	(2,329)	(4,096)
Other expense	21,760	22,379	68,057	55,561
Total noninterest expense	177,616	149,058	524,628	456,032
Income before income taxes	79,316	58,491	213,748	123,970
Income taxes	20,414	11,772	53,565	26,505
Net income	$ 58,902	$ 46,719	$ 160,183	$ 97,465
Earnings per common share-basic	$ 0.68	$ 0.59	$ 1.85	$ 1.23
Earnings per common share-diluted	0.68	0.59	1.85	1.23
Dividends paid per share	$ 0.24	$ 0.24	$ 0.72	$ 0.72
Weighted average shares outstanding-basic	84,749	77,550	84,577	77,525
Weighted average shares outstanding-diluted	84,980	77,677	84,818	77,653