Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
INTEREST REVENUE:
Loans and leases	$ 98,836	$ 105,937	$ 296,452	$ 322,686
Deposits with other banks	310	399	1,395	1,182
Federal funds sold and securities purchased under agreement to resell		2		3
Available-for-sale securities:
Taxable	8,218	9,329	25,323	30,679
Tax-exempt	3,866	4,109	11,737	12,575
Loans held for sale	731	974	2,090	2,204
Total interest revenue	111,961	120,750	336,997	369,329
Deposits:
Interest bearing demand	2,061	3,889	7,609	12,523
Savings	383	686	1,318	2,091
Other time	7,271	9,482	22,983	31,048
Federal funds purchased and securities sold under agreement to repurchase	80	73	213	202
Federal Home Loan Bank borrowings	350	364	1,047	1,097
Junior subordinated debt	1,424	2,875	7,141	8,633
Other	151	2	154	5
Total interest expense	11,720	17,371	40,465	55,599
Net interest revenue	100,241	103,379	296,532	313,730
Provision for credit losses	500	6,000	7,500	22,000
Net interest revenue, after provision for credit losses	99,741	97,379	289,032	291,730
NONINTEREST REVENUE:
Mortgage lending	5,134	13,549	35,372	39,731
Credit card, debit card and merchant fees	8,834	8,270	24,681	23,580
Deposit service charges	13,679	14,189	39,335	43,002
Trust income	3,332	3,101	9,734	8,522
Security (losses) gains, net	(5)	39	17	290
Insurance commissions	23,800	23,519	76,303	69,636
Other	7,740	7,753	24,499	24,487
Total noninterest revenue	62,514	70,420	209,941	209,248
NONINTEREST EXPENSE:
Salaries and employee benefits	73,532	74,829	231,230	227,421
Occupancy, net of rental income	10,360	10,944	31,174	31,497
Equipment	4,555	5,083	14,088	15,540
Deposit insurance assessments	3,325	3,998	9,068	13,375
Voluntary early retirement expense			10,850
Write-off and amortization of bond issue cost	2,907	38	2,983	114
Other	34,718	38,896	107,626	118,027
Total noninterest expense	129,397	133,788	407,019	405,974
Income before income taxes	32,858	34,011	91,954	95,004
Income tax expense	8,001	10,186	25,537	27,689
Net income	$ 24,857	$ 23,825	$ 66,417	$ 67,315
Earnings per share:
Basic (in dollars per share)	$ 0.26	$ 0.25	$ 0.70	$ 0.72
Diluted (in dollars per share)	$ 0.26	$ 0.25	$ 0.70	$ 0.72
Dividends declared per common share (in dollars per share)	$ 0.05	$ 0.01	$ 0.07	$ 0.03