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 and fees on loans and leases:
Taxable	$ 65,479	$ 67,902	$ 71,822
Exempt from federal income taxes	4,725	4,918	4,178
Total interest and fees on loans and leases	70,204	72,820	76,000
Interest and dividends on investment securities:
Taxable	5,951	8,063	10,377
Exempt from federal income taxes	4,335	4,469	4,554
Other interest income	164	116	72
Total interest income	80,654	85,468	91,003
Interest expense
Interest on demand deposits	686	939	1,302
Interest on savings deposits	790	1,468	2,555
Interest on time deposits	5,162	6,576	10,054
Interest on short-term borrowings	326	332	2,116
Interest on long-term borrowings	1,210	1,413	1,442
Total interest expense	8,174	10,728	17,469
Net interest income	72,480	74,740	73,534
Provision for loan and lease losses	10,035	17,479	21,565
Net interest income after provision for loan and lease losses	62,445	57,261	51,969
Noninterest income
Trust fee income	6,777	6,344	6,080
Service charges on deposit accounts	4,429	5,057	6,693
Investment advisory commission and fee income	5,363	5,373	4,626
Insurance commission and fee income	8,531	7,733	7,694
Other service fee income	5,855	5,240	5,046
Bank owned life insurance income	2,670	1,668	1,270
Other-than-temporary impairment on equity securities	(13)	(16)	(62)
Net gain on sales of investment securities	305	1,417	432
Net gain on mortgage banking activities	6,088	1,868	2,960
Net loss on interest rate swap			(1,072)
Net gain (loss) on sales and dispositions of fixed assets	1,257	(12)	(11)
Net loss on sales and write-downs of other real estate owned	(1,904)	(798)	(377)
Other	902	533	1,139
Total noninterest income	40,260	34,407	34,418
Noninterest expense
Salaries, commissions and benefits	44,287	38,230	38,034
Net occupancy	5,716	5,782	5,476
Equipment	4,486	4,002	3,811
Marketing and advertising	1,725	1,760	2,318
Deposit insurance premiums	1,689	2,039	2,670
Other	18,379	16,197	15,040
Total noninterest expense	76,282	68,010	67,349
Income before income taxes	26,423	23,658	19,038
Income taxes	5,551	4,776	3,282
Net income	$ 20,872	$ 18,882	$ 15,756
Net income per share:
Basic	$ 1.25	$ 1.13	$ 0.95
Diluted	$ 1.24	$ 1.13	$ 0.95
Dividends declared	$ 0.80	$ 0.80	$ 0.80