Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest Revenue
Loans and leases	$ 425,611	$ 461,076	$ 496,782
Deposits with other banks	1,711	701	355
Federal funds sold and securities purchased under agreement to resell	3	167	606
Held-to-maturity securities:
Taxable	0	13,080	36,278
Tax-exempt	0	5,638	10,409
Available-for-sale securities:
Taxable	39,408	43,989	32,033
Tax-exempt	16,658	10,983	3,275
Loans held for sale	3,033	2,219	3,024
Total interest revenue	486,424	537,853	582,762
Deposits:
Interest bearing demand	16,111	22,646	35,187
Savings	2,697	3,211	3,576
Other time	39,797	61,709	83,999
Federal funds purchased and securities sold under agreement to repurchase	274	458	841
FHLB borrowings	1,446	3,459	6,545
Junior subordinated debt	11,502	11,451	11,461
Other	6	6	11
Total interest expense	71,833	102,940	141,620
Net interest revenue	414,591	434,913	441,142
Provision for credit losses	28,000	130,081	204,016
Net interest revenue, after provision for credit losses	386,591	304,832	237,126
Noninterest Revenue
Mortgage lending	56,919	17,069	29,745
Credit card, debit card and merchant fees	31,705	42,373	37,663
Service charges	56,877	66,670	70,690
Trust income	11,913	12,186	11,149
Securities gains (losses), net	442	12,127	2,569
Insurance commissions	90,138	86,918	82,172
Other	32,155	33,502	30,156
Total noninterest revenue	280,149	270,845	264,144
Noninterest Expense
Salaries and employee benefits	304,624	282,880	271,688
Occupancy, net of rental income	42,140	42,362	43,008
Equipment	20,849	21,707	22,598
Deposit insurance assessments	16,478	21,316	19,259
Prepayment penalty on FHLB borrowings	0	9,778	0
Other	165,102	155,590	130,480
Total noninterest expense	549,193	533,633	487,033
Income before income taxes	117,547	42,044	14,237
Income tax expense (benefit)	33,252	4,475	(8,705)
Net Income	$ 84,295	$ 37,569	$ 22,942
Net Income Per Share: Basic (in dollars per share)	$ 0.90	$ 0.45	$ 0.28
Diluted (in dollars per share)	$ 0.90	$ 0.45	$ 0.27