Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Interest income:
Loans and loans held for sale	$ 161,872	$ 172,517	$ 323,411	$ 343,030
Investment securities:
Taxable	32,175	32,253	64,125	64,275
Tax-exempt	5,327	5,555	11,353	10,895
Total investment securities interest	37,502	37,808	75,478	75,170
Total interest income	199,374	210,325	398,889	418,200
Deposits:
Interest bearing	783	745	1,550	1,481
Savings and money market accounts	5,588	5,477	11,135	11,035
Certificates and other time deposits	2,510	3,009	4,687	5,473
Federal funds purchased and securities sold under agreements to repurchase	329	233	572	429
Wholesale borrowings	2,351	1,391	4,691	2,520
Long-term debt	2,695	3,893	5,513	7,783
Total interest expense	14,256	14,748	28,148	28,721
Net interest income	185,118	195,577	370,741	389,479
Provision for Loan and Lease Losses	8,966	15,253	17,214	29,790
Net interest income after provision for loan losses	176,152	180,324	353,527	359,689
Noninterest income:
Trust department income	10,820	10,070	20,969	19,818
Service charges on deposits	16,704	18,528	32,372	35,176
Credit card fees	14,124	13,455	26,773	25,607
ATM and other service fees	6,345	5,996	12,444	11,816
Bank owned life insurance income	3,697	4,040	7,289	7,622
Investment services and insurance	3,871	3,852	7,575	7,368
Investment securities gains/(losses), net	567	80	921	136
Loan sales and servicing income	3,276	4,462	4,876	8,192
Other operating income	7,178	12,077	19,210	24,096
Total noninterest income	66,582	72,560	132,429	139,831
Noninterest expense:
Salaries, wages, pension and employee benefits	86,020	89,465	176,546	178,478
Net occupancy expense	13,727	14,347	29,681	31,361
Equipment expense	12,592	12,267	23,617	24,178
Stationery, supplies and postage	3,370	3,990	6,898	8,097
Bankcard, loan processing and other costs	12,461	11,810	23,600	22,644
Professional services	5,358	4,745	9,368	10,103
Amortization of intangibles	2,598	2,933	5,196	5,869
FDIC insurance expense	5,077	5,533	10,244	11,504
Other operating expense	20,471	22,310	37,176	44,499
Total noninterest expense	161,674	167,400	322,326	336,733
Income before income tax expense	81,060	85,484	163,630	162,787
Income tax expense	24,476	25,965	49,907	49,813
Net income	56,584	59,519	113,723	112,974
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	467	489	937	926
Preferred Stock Dividends, Income Statement Impact	1,469	1,469	2,938	2,938
Net income attributable to common shareholders	54,648	57,561	109,848	109,110
Net income used in diluted EPS calculation	$ 54,648	$ 57,561	$ 109,848	$ 109,110
Weighted average number of common shares outstanding - basic	165,736	165,335	165,574	165,198
Weighted average number of common shares outstanding - diluted	166,277	166,147	166,089	166,052
Basic earnings per common share	$ 0.33	$ 0.35	$ 0.66	$ 0.66
Diluted earnings per common share	0.33	0.35	0.66	0.66
Cash dividend per common share	$ 0.16	$ 0.16	$ 0.32	$ 0.32