Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Interest income:
Interest and fees on loans	$ 58,084	$ 61,475	$ 115,994	$ 123,866
Interest and dividends on investment securities:
Taxable	9,458	10,649	19,163	20,560
Exempt from federal taxes	1,240	1,194	2,444	2,365
Interest on deposits in banks	279	227	516	594
Interest on federal funds sold	6	6	7	9
Total interest income	69,067	73,551	138,124	147,394
Interest expense:
Interest on deposits	5,779	8,903	12,041	18,774
Interest on securities sold under repurchase agreements	152	171	308	408
Interest on long-term debt	495	495	993	984
Interest on subordinated debentures held by subsidiary trusts	1,467	1,455	2,974	2,903
Total interest expense	7,893	11,024	16,316	23,069
Net interest income	61,174	62,527	121,808	124,325
Provision for loan losses	12,000	15,400	23,250	30,400
Net interest income after provision for loan losses	49,174	47,127	98,558	93,925
Non-interest income:
Income from the origination and sale of loans	9,420	4,109	17,804	7,554
Other service charges, commissions and fees	8,254	7,768	16,678	15,148
Service charges on deposit accounts	4,455	4,385	8,616	8,495
Wealth management revenues	3,815	3,689	7,098	6,999
Investment securities gains, net	198	16	229	18
Other income	1,520	1,624	3,619	3,536
Total non-interest income	27,662	21,591	54,044	41,750
Non-interest expense:
Salaries and wages	21,640	20,554	43,204	40,757
Employee benefits	6,819	7,335	15,785	14,834
Occupancy, net	4,037	4,013	8,025	8,228
Furniture and equipment	3,189	3,129	6,327	6,349
Outsourced technology services	2,179	2,212	4,445	4,453
OREO expense, net of income	1,806	2,042	2,911	3,753
FDIC insurance premiums	1,601	1,629	3,196	4,095
Professional fees	1,002	726	1,935	1,505
Mortgage servicing rights amortization	817	671	1,712	1,478
Mortgage servicing rights impairment recovery	52	27	(816)	(320)
Core deposit intangibles amortization	355	361	710	723
Other expenses	13,802	11,493	27,305	21,295
Total non-interest expense	57,299	54,192	114,739	107,150
Income before income tax expense	19,537	14,526	37,863	28,525
Income tax expense	6,527	4,672	12,639	9,165
Net income	13,010	9,854	25,224	19,360
Preferred stock dividends	853	853	1,706	1,697
Net income available to common stockholders	$ 12,157	$ 9,001	$ 23,518	$ 17,663
Basic earnings per common share	$ 0.28	$ 0.21	$ 0.55	$ 0.41
Diluted earnings per common share	$ 0.28	$ 0.21	$ 0.55	$ 0.41