Consolidated Statements of Income and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Interest income:
Loans and loans held for sale	$ 98,672	$ 103,082
Investment securities:
Taxable	19,239	22,418
Tax-exempt	4,045	3,580
Total investment securities interest	23,284	25,998
Total interest income	121,956	129,080
Interest expense:
Demand-interest bearing	318	247
Savings and money market accounts	5,315	5,103
Certificates and other time deposits	2,063	3,524
Securities sold under agreements to repurchase	313	268
Wholesale borrowings	850	1,151
Long-term Debt	1,748	0
Total interest expense	10,607	10,293
Net interest income	111,349	118,787
Provision for noncovered loan losses	5,808	8,129
Provision for covered loan losses	4,138	5,932
Net interest income after provision for loan losses	101,403	104,726
Other income:
Trust department income	5,741	5,627
Service charges on deposits	12,585	14,409
Credit card fees	10,222	10,180
ATM and other service fees	3,335	3,790
Bank owned life insurance income	4,897	3,056
Investment services and insurance	2,415	2,247
Investment securities gains, net	(9)	260
Loan sales and servicing income	7,863	6,691
Other operating income	10,343	5,466
Total other income	57,392	51,726
Other expenses:
Salaries, wages, pension and employee benefits	57,906	63,973
Net occupancy expense	8,282	8,592
Equipment expense	7,349	7,104
Stationery, supplies and postage	2,096	2,143
Bankcard, loan processing and other costs	7,840	7,653
Professional services	5,410	3,352
Amortization of intangibles	317	483
FDIC expense	3,526	3,720
Other operating expense	14,199	16,748
Total other expenses	106,925	113,768
Income before income tax expense	51,870	42,684
Income tax expense	14,524	12,340
Net income	37,346	30,344
Other comprehensive income (loss), net of taxes:
Changes in unrealized securities' holding gains and (losses), net of taxes of ($4.3) million and $1.0 million	(7,920)	1,884
Reclassification for realized securities' (gains) and losses, net of taxes of ($.003) million and $.09 million	6	(169)
Total other comprehensive gain (loss), net of taxes	(7,914)	1,715
Comprehensive income	29,432	32,059
Net income available to common shareholders	36,125	30,207
Net income used in diluted EPS calculation	$ 36,125	$ 30,207
Weighted average number of common shares outstanding - basic	109,689	109,211
Weighted average number of common shares outstanding-diluted	109,689	109,211
Basic earnings per common share (in dollars per share)	$ 0.33	$ 0.28
Diluted earnings per common share (in dollars per share)	$ 0.33	$ 0.28
Dividend per common share (in dollars per share)	$ 0.16	$ 0.16