CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Interest income
Interest and fees on loans	$ 68,571	$ 64,941	$ 60,116
Interest on money market investments	46	43	6
Interest and dividends on securities
U.S. government agencies and corporations	206	281	418
Tax-exempt obligations of states and political subdivisions	4,859	4,459	4,208
Corporate bonds and other	108	124	223
Total interest income	73,790	69,848	64,971
Interest expense
Savings and interest-bearing deposits	1,102	1,142	1,711
Certificates of deposit, $100 thousand or more	2,684	3,161	3,433
Other time deposits	3,217	3,935	5,174
Borrowings	3,892	3,998	4,071
Trust preferred capital notes	986	999	1,070
Total interest expense	11,881	13,235	15,459
Net interest income	61,909	56,613	49,512
Provision for loan losses	14,160	14,959	18,563
Net interest income after provision for loan losses	47,749	41,654	30,949
Noninterest income
Gains on sales of loans	16,094	18,564	24,976
Service charges on deposit accounts	3,509	3,511	3,303
Other service charges and fees	5,290	4,913	5,018
Investment services income	1,008	834	648
Net gains on calls and sales of available for sale securities	13	70	22
Other income	1,132	1,808	2,722
Total noninterest income	27,046	29,700	36,689
Noninterest expenses
Salaries and employee benefits	34,317	34,889	35,118
Occupancy expenses	6,491	5,768	5,714
Other expenses	15,276	19,638	19,335
Total noninterest expenses	56,084	60,295	60,167
Income before income taxes	18,711	11,059	7,471
Income tax expense	5,735	2,949	1,945
Net income	12,976	8,110	5,526
Effective dividends on preferred stock	1,183	1,149	1,130
Net income available to common shareholders	$ 11,793	$ 6,961	$ 4,396
Earnings per common share-basic (in dollars per share)	$ 3.76	$ 2.26	$ 1.44
Earnings per common share-assuming dilution (in dollars per share)	$ 3.72	$ 2.24	$ 1.44