Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Interest income:
Loans and loans held for sale	$ 161,539	$ 170,514
Investment securities:
Taxable	31,950	32,022
Tax-exempt	6,026	5,340
Total investment securities interest	37,976	37,362
Total interest income	199,515	207,876
Deposits:
Interest bearing	767	737
Savings and money market accounts	5,547	5,559
Certificates and other time deposits	2,177	2,464
Federal funds purchased and securities sold under agreements to repurchase	243	197
Wholesale borrowings	2,340	1,129
Long-term debt	2,818	3,890
Total interest expense	13,892	13,976
Net interest income	185,623	193,900
Provision for Loan and Lease Losses	8,248	14,536
Net interest income after provision for loan losses	177,375	179,364
Noninterest income:
Trust department income	10,149	9,748
Service charges on deposits	15,668	16,648
Credit card fees	12,649	12,152
ATM and other service fees	6,099	5,819
Bank owned life insurance income	3,592	3,582
Investment services and insurance	3,704	3,516
Investment securities gains/(losses), net	354	56
Loan sales and servicing income	1,600	3,730
Other operating income	12,032	12,019
Total noninterest income	65,847	67,270
Noninterest expense:
Salaries, wages, pension and employee benefits	90,526	89,013
Net occupancy expense	15,954	17,014
Equipment expense	11,025	11,911
Stationery, supplies and postage	3,528	4,108
Bankcard, loan processing and other costs	11,139	10,834
Professional services	4,010	5,359
Amortization of intangibles	2,598	2,936
FDIC insurance expense	5,167	5,971
Other operating expense	16,705	22,185
Total noninterest expense	160,652	169,331
Income before income tax expense	82,570	77,303
Income tax expense	25,431	23,848
Net income	57,139	53,455
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	407	380
Preferred Stock Dividends, Income Statement Impact	1,469	1,469
Net income attributable to common shareholders	55,263	51,606
Net income used in diluted EPS calculation	$ 55,263	$ 51,606
Weighted average number of common shares outstanding - basic	165,411	165,060
Weighted average number of common shares outstanding - diluted	166,003	166,004
Basic earnings per common share	$ 0.33	$ 0.31
Diluted earnings per common share	$ 0.33	$ 0.31
Cash dividend per common share	$ 0.16	$ 0.16