Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Interest income:
Interest and fees on loans	$ 57,418	$ 61,372	$ 173,412	$ 185,238
Interest and dividends on investment securities:
Taxable	9,194	10,721	28,357	31,281
Exempt from federal taxes	1,223	1,188	3,667	3,553
Interest on deposits in banks	336	200	852	794
Interest on federal funds sold	4	2	11	11
Total interest income	68,175	73,483	206,299	220,877
Interest expense:
Interest on deposits	5,414	7,905	17,455	26,679
Interest on securities sold under repurchase agreements	144	137	452	545
Interest on long-term debt	502	498	1,495	1,482
Interest on subordinated debentures held by subsidiary trusts	1,110	1,451	4,084	4,354
Total interest expense	7,170	9,991	23,486	33,060
Net interest income	61,005	63,492	182,813	187,817
Provision for loan losses	9,500	14,000	32,750	44,400
Net interest income after provision for loan losses	51,505	49,492	150,063	143,417
Non-interest income:
Income from the origination and sale of loans	11,665	5,512	29,469	13,066
Other service charges, commissions and fees	8,774	8,479	25,452	23,627
Service charges on deposit accounts	4,395	4,609	13,011	13,104
Wealth management revenues	3,557	3,202	10,655	9,980
Investment securities gains, net	66	38	295	56
Other income	1,725	1,285	5,344	5,042
Total non-interest income	30,182	23,125	84,226	64,875
Non-interest expense:
Salaries and wages	23,341	20,801	66,545	61,557
Employee benefits	7,447	6,087	23,232	20,922
Occupancy, net	3,793	4,180	11,818	12,408
Furniture and equipment	3,231	3,018	9,558	9,367
Outsourced technology services	2,182	2,235	6,627	6,688
OREO expense, net of income	2,612	2,878	5,523	6,631
FDIC insurance premiums	1,622	1,631	4,818	5,726
Professional fees	1,050	995	2,985	2,500
Mortgage servicing rights amortization	879	807	2,591	2,285
Mortgage servicing rights impairment recovery	55	1,168	(761)	848
Core deposit intangibles amortization	355	362	1,066	1,085
Other expenses	10,497	10,879	37,801	32,174
Total non-interest expense	57,064	55,041	171,803	162,191
Income before income tax expense	24,623	17,576	62,486	46,101
Income tax expense	8,468	5,655	21,107	14,820
Net income	16,155	11,921	41,379	31,281
Preferred stock dividends	863	862	2,569	2,559
Net income available to common stockholders	$ 15,292	$ 11,059	$ 38,810	$ 28,722
Basic earnings per common share	$ 0.36	$ 0.26	$ 0.90	$ 0.67
Diluted earnings per common share	$ 0.35	$ 0.26	$ 0.90	$ 0.67