CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest and dividend income:
Loans	$ 59,209	$ 51,921	$ 49,651
Investment securities:
Taxable	9,359	10,164	13,836
Nontaxable	13,408	12,766	12,742
Total interest and dividend income	81,976	74,851	76,229
Interest expense:
Savings, NOW and money market deposits	1,955	2,302	3,393
Time deposits	6,171	5,040	5,803
Short-term borrowings	148	288	195
Long-term debt	6,774	4,734	6,736
Total interest expense	15,048	12,364	16,127
Net interest income	66,928	62,487	60,102
Provision for loan losses	3,189	2,997	3,628
Net interest income after provision for loan losses	63,739	59,490	56,474
Noninterest income:
Investment Management Division income	2,058	1,872	1,624
Service charges on deposit accounts	2,974	3,019	3,053
Net gains on sales of securities	141	16	3,613
Other	2,228	2,138	1,898
Total noninterest income	7,401	7,045	10,188
Noninterest expense:
Salaries	18,885	17,160	16,360
Employee benefits	4,833	5,517	5,035
Occupancy and equipment	8,880	7,669	7,265
Debt extinguishment	0	0	3,812
Other	9,433	9,154	8,780
Total noninterest expense	42,031	39,500	41,252
Income before income taxes	29,109	27,035	25,410
Income tax expense	6,095	5,735	5,017
Net Income	$ 23,014	$ 21,300	$ 20,393
Weighted average:
Common shares (in shares)	13,807,482	13,633,479	13,372,839
Dilutive stock options and restricted stock units (in shares)	147,105	124,746	128,312
Weighted average number of shares (in shares)	13,954,587	13,758,225	13,501,151
Earnings per share:
Basic (in dollars per share)	$ 1.67	$ 1.56	$ 1.52
Diluted (in dollars per share)	$ 1.65	$ 1.55	$ 1.51
Cash dividends declared per share (in dollars per share)	$ 0.72	$ 0.68	$ 0.64