CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest income
Interest and fees on loans	$ 71,947	$ 68,571	$ 64,941
Interest on money market investments	22	46	43
Interest and dividends on securities
U.S. government agencies and corporations	213	206	281
Tax-exempt obligations of states and political subdivisions	4,659	4,859	4,459
Corporate bonds and other	123	108	124
Total interest income	76,964	73,790	69,848
Interest expense
Savings and interest-bearing deposits	824	1,102	1,142
Certificates of deposit, $100 or more	2,047	2,684	3,161
Other time deposits	2,454	3,217	3,935
Borrowings	3,799	3,892	3,998
Trust preferred capital notes	987	986	999
Total interest expense	10,111	11,881	13,235
Net interest income	66,853	61,909	56,613
Provision for loan losses	12,405	14,160	14,959
Net interest income after provision for loan losses	54,448	47,749	41,654
Noninterest income
Gains on sales of loans	20,572	16,094	18,564
Service charges on deposit accounts	3,326	3,509	3,511
Other service charges and fees	6,310	5,290	4,913
Investment services income	1,017	1,008	834
Net gains on calls and sales of available for sale securities	11	13	70
Other income	2,266	1,132	1,808
Total noninterest income	33,502	27,046	29,700
Noninterest Expenses
Salaries and employee benefits	40,693	34,317	34,889
Occupancy expenses	6,795	6,491	5,768
Other expenses	16,434	15,276	19,638
Total noninterest expenses	63,922	56,084	60,295
Income before income taxes	24,028	18,711	11,059
Income tax expense	7,646	5,735	2,949
Net income	16,382	12,976	8,110
Effective dividends on preferred stock	311	1,183	1,149
Net income available to common shareholders	$ 16,071	$ 11,793	$ 6,961
Earnings per common share-basic (in dollars per share)	$ 5.00	$ 3.76	$ 2.26
Earnings per common share-assuming dilution (in dollars per share)	$ 4.86	$ 3.72	$ 2.24