Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest income:
Loans, including fees	$ 156,717	$ 141,905	$ 310,830	$ 288,872
Loans held for sale	249	222	408	318
Securities-taxable	23,049	21,674	47,006	42,464
Securities-tax exempt	3,011	845	4,813	1,725
Short-term investments	480	274	1,090	628
Total interest income	183,506	164,920	364,147	334,007
Interest expense:
Deposits	12,603	7,621	24,336	14,747
Short-term borrowings	909	186	1,902	358
Long-term debt	5,025	5,322	10,104	8,953
Total interest expense	18,537	13,129	36,342	24,058
Net interest income	164,969	151,791	327,805	309,949
Provision for loan losses	17,196	6,608	77,232	12,762
Net interest income after provision for loan losses	147,773	145,183	250,573	297,187
Noninterest income:
Service charges on deposit accounts	18,394	17,908	36,777	35,223
Trust fees	12,089	11,795	23,313	22,995
Bank card and ATM fees	11,954	11,868	23,302	23,051
Investment and annuity fees	5,043	4,838	9,976	9,888
Secondary mortgage market operations	4,176	3,618	7,088	6,282
Insurance commissions and fees	1,240	2,595	2,547	4,349
Amortization of FDIC loss share receivable	(1,526)	(1,273)	(3,139)	(2,470)
Securities transactions	768		1,114	333
Other income	11,556	9,525	20,902	17,769
Total noninterest income	63,694	60,874	121,880	117,420
Noninterest expense:
Compensation expense	70,233	70,550	143,234	135,567
Employee benefits	14,004	12,870	29,718	28,504
Personnel expense	84,237	83,420	172,952	164,071
Net occupancy expense	10,394	11,804	20,750	22,981
Equipment expense	3,080	4,090	6,854	8,025
Data processing expense	14,370	14,012	28,577	27,568
Professional services expense	7,712	8,952	15,333	24,322
Amortization of intangibles	5,005	6,148	10,129	12,466
Telecommunications and postage	3,272	3,471	6,633	7,122
Deposit insurance and regulatory fees	6,049	4,213	11,446	7,808
Other real estate expense, net	350	501	1,118	957
Other expense	16,473	22,306	33,182	37,112
Total noninterest expense	150,942	158,917	306,974	312,432
Income before income taxes	60,525	47,140	65,479	102,175
Income taxes	13,618	12,311	14,733	27,187
Net income	$ 46,907	$ 34,829	$ 50,746	$ 74,988
Earnings per common share-basic	$ 0.59	$ 0.44	$ 0.64	$ 0.93
Earnings per common share-diluted	0.59	0.44	0.64	0.93
Dividends paid per share	$ 0.24	$ 0.24	$ 0.48	$ 0.48
Weighted average shares outstanding-basic	77,523	77,951	77,512	78,719
Weighted average shares outstanding-diluted	77,680	78,115	77,676	78,881