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 and loans held for sale	$ 162,977	$ 161,872	$ 325,255	$ 323,411
Investment securities:
Taxable	33,350	32,175	66,499	64,125
Tax-exempt	5,013	5,327	10,274	11,353
Total investment securities interest	38,363	37,502	76,773	75,478
Total interest income	201,340	199,374	402,028	398,889
Deposits:
Interest bearing	1,013	783	1,942	1,550
Savings and money market accounts	5,641	5,588	11,293	11,135
Certificates and other time deposits	3,116	2,510	6,405	4,687
Federal funds purchased and securities sold under agreements to repurchase	109	329	374	572
Wholesale borrowings	1,121	1,129	2,355	2,289
Long-term debt	4,262	3,917	8,425	7,915
Total interest expense	15,262	14,256	30,794	28,148
Net interest income	186,078	185,118	371,234	370,741
Provision for loan losses	6,391	8,966	14,200	17,214
Net interest income after provision for loan losses	179,687	176,152	357,034	353,527
Noninterest income:
Trust department income	11,167	10,820	21,451	20,969
Service charges on deposits	16,263	16,704	31,849	32,372
Credit card fees	14,942	14,124	28,520	26,773
ATM and other service fees	6,427	6,345	12,661	12,444
Bank owned life insurance income	4,186	3,697	7,882	7,289
Investment services and insurance	3,851	3,871	7,756	7,575
Investment securities gains/(losses), net	2,164	567	2,459	921
Loan sales and servicing income	1,995	3,276	3,847	4,876
Other operating income	4,120	7,178	16,084	19,210
Total noninterest income	65,115	66,582	132,509	132,429
Noninterest expense:
Salaries, wages, pension and employee benefits	86,789	86,020	172,669	176,546
Net occupancy expense	13,466	13,727	28,240	29,681
Equipment expense	12,078	12,592	24,486	23,617
Stationery, supplies and postage	2,945	3,370	6,564	6,898
Bankcard, loan processing and other costs	12,269	12,461	23,277	23,600
Professional services	4,467	5,358	12,818	9,368
Amortization of intangibles	2,304	2,598	4,608	5,196
FDIC insurance expense	5,192	5,077	10,637	10,244
Other operating expense	20,810	20,471	43,984	37,176
Total noninterest expense	160,320	161,674	327,283	322,326
Income before income tax expense	84,482	81,060	162,260	163,630
Income tax expense	26,173	24,476	49,815	49,907
Net income	58,309	56,584	112,445	113,723
Less: Net income allocated to participating shareholders	496	467	955	937
Preferred Stock dividends	1,469	1,469	2,938	2,938
Net income attributable to common shareholders	56,344	54,648	108,552	109,848
Net income used in diluted EPS calculation	$ 56,344	$ 54,648	$ 108,552	$ 109,848
Weighted average number of common shares outstanding - basic	166,188	165,736	165,966	165,574
Weighted average number of common shares outstanding - diluted	166,807	166,277	166,563	166,089
Basic earnings per common share (in dollars per share)	$ 0.34	$ 0.33	$ 0.65	$ 0.66
Diluted earnings per common share (in dollars per share)	0.34	0.33	0.65	0.66
Cash dividend per common share (in dollars per share)	$ 0.17	$ 0.16	$ 0.34	$ 0.32