Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Loans including fees:
Taxable	$ 63,223	$ 62,911	$ 127,441	$ 125,041
Nontaxable	2,380	2,228	4,559	4,447
Investment securities, available-for-sale:
Taxable	11,140	11,316	22,212	22,660
Nontaxable	4,933	3,905	9,483	7,485
Investment securities, held-to-maturity, taxable	3,999	4,894	8,069	9,869
Money market and other interest-earning investments	7	10	20	25
Total interest income	85,682	85,264	171,784	169,527
Interest Expense
Deposits	5,016	7,044	10,284	14,726
Short-term borrowings	213	118	480	245
Other borrowings	1,262	2,129	2,779	4,310
Total interest expense	6,491	9,291	13,543	19,281
Net interest income	79,191	75,973	158,241	150,246
Provision for loan losses	(3,693)	393	(2,848)	2,449
Net interest income after provision for loan losses	82,884	75,580	161,089	147,797
Noninterest Income
Wealth management fees	6,412	5,844	12,068	10,940
Service charges on deposit accounts	11,766	12,904	22,864	25,766
ATM fees	5,942	5,895	11,740	12,228
Mortgage banking revenue	1,593	773	2,866	1,332
Insurance premiums and commissions	9,318	9,311	20,261	18,925
Investment product fees	4,074	3,163	7,657	6,094
Company-owned life insurance	1,614	1,512	3,258	3,007
Net securities gains	1,789	6,992	2,808	7,611
Total other-than-temporary impairment losses		(780)		(876)
Loss recognized in other comprehensive income
Impairment losses recognized in earnings		(780)		(876)
Gain (loss) on derivatives	144	249	132	431
Gain on sale leaseback transactions	1,791	1,606	3,375	3,213
Gain on branch divestitures-deposit premium			2,244
Change in FDIC indemnification asset	(1,474)	(4,005)	(3,776)	759
Other income	3,275	5,078	7,062	8,245
Total noninterest income	46,244	48,542	92,559	97,675
Noninterest Expense
Salaries and employee benefits	48,723	46,751	99,683	92,797
Occupancy	12,029	13,256	24,113	25,716
Equipment	2,775	2,967	5,673	5,823
Marketing	1,934	1,495	3,139	2,937
Data processing	5,659	5,934	10,891	11,403
Communication	2,703	2,602	5,269	5,426
Professional fees	2,834	2,630	6,503	5,354
Loan expense	1,969	1,528	3,585	3,136
Supplies	649	609	1,218	1,367
FDIC assessment	118	1,379	1,770	2,774
Other real estate owned expense	1,537	1,576	2,551	11,383
Amortization of intangibles	1,840	1,911	4,365	3,932
Other expense	4,146	3,389	8,339	5,266
Total noninterest expense	86,916	86,027	177,099	177,314
Income before income taxes	42,212	38,095	76,549	68,158
Income tax expense	13,734	10,889	24,126	19,229
Net income	$ 28,478	$ 27,206	$ 52,423	$ 48,929
Net income per common share-basic	$ 0.28	$ 0.29	$ 0.52	$ 0.52
Net income per common share-diluted	$ 0.28	$ 0.29	$ 0.52	$ 0.52
Weighted average number of common shares outstanding-basic	100,981	94,514	101,031	94,479
Weighted average number of common shares outstanding-diluted	101,352	94,871	101,448	94,847
Dividends per common share	$ 0.10	$ 0.09	$ 0.20	$ 0.18