CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest and dividend income:
Loans	$ 49,651	$ 47,777	$ 45,660
Investment securities:
Taxable	13,836	16,662	16,879
Nontaxable	12,742	11,873	9,864
Total interest and dividend income	76,229	76,312	72,403
Interest expense:
Savings, NOW and money market deposits	3,393	4,035	4,049
Time deposits	5,803	6,052	5,977
Short-term borrowings	195	93	108
Long-term debt	6,736	7,387	6,640
Total interest expense	16,127	17,567	16,774
Net interest income	60,102	58,745	55,629
Provision for loan losses	3,628	4,061	3,973
Net interest income after provision for loan losses	56,474	54,684	51,656
Noninterest income:
Investment Management Division income	1,624	1,539	1,465
Service charges on deposit accounts	3,053	3,186	3,465
Net gains on sales of available-for-sale securities	3,613	138	1,719
Other	1,898	1,563	1,284
Total noninterest income	10,188	6,426	7,933
Noninterest expense:
Salaries	16,360	15,785	15,458
Employee benefits	5,035	5,066	5,303
Occupancy and equipment	7,265	7,148	6,486
Debt extinguishment	3,812	0	0
Other operating	8,780	8,710	8,579
Total noninterest expense	41,252	36,709	35,826
Income before income taxes	25,410	24,401	23,763
Income tax expense	5,017	4,944	5,371
Net Income	$ 20,393	$ 19,457	$ 18,392
Weighted average:
Common shares (in shares)	8,915,226	8,761,895	7,899,241
Dilutive stock options and restricted stock units (in shares)	85,541	93,069	108,436
Weighted average number of shares (in shares)	9,000,767	8,854,964	8,007,677
Earnings per share:
Basic (in dollars per share)	$ 2.29	$ 2.22	$ 2.33
Diluted (in dollars per share)	$ 2.27	$ 2.20	$ 2.30
Cash dividends declared per share (in dollars per share)	$ 0.96	$ 0.90	$ 0.84