Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Interest income:
Loans and loans held for sale	$ 162,204	$ 170,648	$ 485,615	$ 513,678
Investment securities:
Taxable	32,641	32,072	96,766	96,347
Tax-exempt	5,214	5,477	16,567	16,372
Total investment securities interest	37,855	37,549	113,333	112,719
Total interest income	200,059	208,197	598,948	626,397
Deposits:
Interest bearing	750	755	2,300	2,236
Savings and money market accounts	5,639	5,570	16,774	16,605
Certificates and other time deposits	2,757	2,846	7,444	8,319
Federal funds purchased and securities sold under agreements to repurchase	254	268	826	697
Wholesale borrowings	1,171	1,397	3,459	3,917
Long-term debt	4,165	3,783	12,081	11,566
Total interest expense	14,736	14,619	42,884	43,340
Net interest income	185,323	193,578	556,064	583,057
Provision for Loan and Lease Losses	14,275	9,192	31,489	38,982
Net interest income after provision for loan losses	171,048	184,386	524,575	544,075
Noninterest income:
Trust department income	10,948	10,300	31,917	30,118
Service charges on deposits	17,295	18,684	49,667	53,860
Credit card fees	13,939	13,754	40,712	39,361
ATM and other service fees	6,518	6,182	18,962	17,998
Bank owned life insurance income	4,622	4,218	11,911	11,840
Investment services and insurance	4,032	3,606	11,607	10,974
Investment securities gains/(losses), net	41	14	962	150
Loan sales and servicing income	2,414	4,740	7,290	12,932
Other operating income	11,617	8,235	30,827	32,331
Total noninterest income	71,426	69,733	203,855	209,564
Noninterest expense:
Salaries, wages, pension and employee benefits	85,772	90,593	262,318	269,071
Net occupancy expense	13,540	13,887	43,221	45,248
Equipment expense	12,235	12,188	35,852	36,366
Stationery, supplies and postage	3,304	3,723	10,202	11,820
Bankcard, loan processing and other costs	12,335	11,151	35,935	33,795
Professional services	5,154	5,270	14,522	15,373
Amortization of intangibles	2,598	2,933	7,794	8,802
FDIC insurance expense	5,234	2,988	15,478	14,492
Other operating expense	20,570	20,412	57,746	64,911
Total noninterest expense	160,742	163,145	483,068	499,878
Income before income tax expense	81,732	90,974	245,362	253,761
Income tax expense	22,720	27,076	72,627	76,889
Net income	59,012	63,898	172,735	176,872
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	477	519	1,401	1,433
Preferred Stock Dividends, Income Statement Impact	1,469	1,469	4,407	4,407
Net income attributable to common shareholders	57,066	61,910	166,927	171,032
Net income used in diluted EPS calculation	$ 57,066	$ 61,910	$ 166,927	$ 171,032
Weighted average number of common shares outstanding - basic	165,762	165,389	165,638	165,263
Weighted average number of common shares outstanding - diluted	166,058	165,804	165,939	165,916
Basic earnings per common share	$ 0.34	$ 0.37	$ 1.01	$ 1.03
Diluted earnings per common share	0.34	0.37	1.01	1.03
Cash dividend per common share	$ 0.17	$ 0.16	$ 0.49	$ 0.48