Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest income
Interest and fees on loans	$ 71,264	$ 75,524	$ 213,909	$ 226,852
Interest on federal funds sold and other short-term investments	157	145	446	903
Interest and dividends on securities:
Taxable	4,585	4,843	11,973	13,841
Tax-exempt	699	824	2,187	2,633
Total interest income	76,705	81,336	228,515	244,229
Interest expense
Interest on deposits	6,569	7,844	20,403	24,776
Interest on short-term borrowings	276	59	694	184
Interest on long-term borrowings	2,230	3,419	6,763	11,234
Total interest expense	9,075	11,322	27,860	36,194
Net interest income	67,630	70,014	200,655	208,035
Provision for loan losses	4,777	4,346	14,924	11,915
Net interest income after provision for loan losses	62,853	65,668	185,731	196,120
Other income
Fees from trust and brokerage services	4,006	4,170	12,206	12,167
Fees from deposit services	10,341	10,521	30,173	31,226
Bankcard fees and merchant discounts	1,003	866	2,699	2,251
Other service charges, commissions, and fees	599	513	1,786	1,690
Income from bank-owned life insurance	1,138	1,247	4,712	3,791
Income from mortgage banking	605	819	2,309	1,620
Other income	542	686	2,279	1,992
Total other-than-temporary impairment losses	0	(1,606)	285	(4,991)
Portion of loss recognized in other comprehensive income	0	(649)	(1,256)	(383)
Net other-than-temporary impairment losses	0	(2,255)	(971)	(5,374)
Net gains on sales/calls of investment securities	101	67	589	184
Net investment securities gains (losses)	101	(2,188)	(382)	(5,190)
Total other income	18,335	16,634	55,782	49,547
Other expense
Employee compensation	17,269	17,258	50,830	53,130
Employee benefits	5,842	5,271	17,510	16,286
Net occupancy expense	4,931	5,060	14,943	15,423
Other real estate owned (OREO) expense	1,535	2,160	5,135	6,648
Equipment expense	1,960	2,051	5,370	6,400
Data processing expense	2,880	3,675	8,424	9,523
Bankcard processing expense	331	342	988	959
FDIC insurance expense	1,539	1,489	4,662	4,539
Other expense	12,298	16,563	37,519	42,475
Total other expense	48,585	53,869	145,381	155,383
Income before income taxes	32,603	28,433	96,132	90,284
Income taxes	10,433	9,099	30,164	28,891
Net income	$ 22,170	$ 19,334	$ 65,968	$ 61,393
Earnings per common share:
Basic	$ 0.44	$ 0.38	$ 1.31	$ 1.22
Diluted	$ 0.44	$ 0.38	$ 1.31	$ 1.22
Dividends per common share	$ 0.31	$ 0.31	$ 0.93	$ 0.93
Average outstanding shares:
Basic	50,378,613	50,276,074	50,336,741	50,262,089
Diluted	50,472,959	50,295,162	50,402,455	50,298,998