Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
INTEREST REVENUE:
Loans and leases	$ 396,441	$ 425,611	$ 461,076
Deposits with other banks	1,694	1,711	701
Federal funds sold and securities purchased under agreement to resell		3	167
Held-to-maturity securities:
Taxable			13,080
Tax-exempt			5,638
Available-for-sale securities:
Taxable	33,286	39,408	43,989
Tax-exempt	15,547	16,658	10,983
Loans held for sale	2,539	3,033	2,219
Total interest revenue	449,507	486,424	537,853
Deposits:
Interest bearing demand	9,645	16,111	22,646
Savings	1,705	2,697	3,211
Other time	29,729	39,797	61,709
Federal funds purchased and securities sold under agreement to repurchase	297	274	458
Long-term debt	1,803	1,446	3,459
Junior subordinated debt	7,376	11,502	11,451
Other	3	6	6
Total interest expense	50,558	71,833	102,940
Net interest revenue	398,949	414,591	434,913
Provision for credit losses	7,500	28,000	130,081
Net interest revenue, after provision for credit losses	391,449	386,591	304,832
NONINTEREST REVENUE:
Mortgage lending	44,977	56,919	17,069
Credit card, debit card and merchant fees	33,005	31,705	42,373
Deposit service charges	52,905	56,877	66,670
Trust income	13,451	11,913	12,186
Security gains, net	46	442	12,127
Insurance commissions	97,700	90,138	86,918
Other	32,982	32,155	33,502
Total noninterest revenue	275,066	280,149	270,845
NONINTEREST EXPENSE:
Salaries and employee benefits	306,696	304,624	282,880
Occupancy, net of rental income	41,109	42,140	42,362
Equipment	18,386	20,849	21,707
Deposit insurance assessments	11,755	16,478	21,316
Voluntary early retirement expense	10,850
Write-off and amortization of bond issue cost	2,995	153	153
Prepayment penalty on FHLB borrowings			9,778
Other	143,058	164,949	155,437
Total noninterest expense	534,849	549,193	533,633
Income before income taxes	131,666	117,547	42,044
Income tax expense	37,551	33,252	4,475
Net Income	$ 94,115	$ 84,295	$ 37,569
Earnings per share: Basic (in dollars per share)	$ 0.99	$ 0.90	$ 0.45
Earnings per share: Diluted (in dollars per share)	$ 0.99	$ 0.90	$ 0.45