Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest and dividend income
Interest and fees on loans	$ 25,056	$ 23,531	$ 23,416
Interest on debt securities:
Taxable	885	950	817
Tax exempt	589	436	367
Dividends	95	43	68
Interest on federal funds sold and overnight deposits	51	15	24
Interest on interest bearing deposits in banks	160	169	160
Total interest and dividend income	26,836	25,144	24,852
Interest expense
Interest on deposits	1,622	1,682	1,746
Interest on short-term borrowed funds	8	9	5
Interest on long-term borrowed funds	431	334	404
Total interest expense	2,061	2,025	2,155
Net interest income	24,775	23,119	22,697
Provision for loan losses	150	550	345
Net interest income after provision for loan losses	24,625	22,569	22,352
Noninterest income
Trust income	737	719	726
Service fees	5,871	5,568	5,354
Net gains on sales of investment securities available-for-sale	71	53	315
Net gains on sales of loans held for sale	2,898	2,871	2,097
Other income	563	581	417
Total noninterest income	10,140	9,792	8,909
Noninterest expenses
Salaries and wages	10,203	9,517	8,916
Pension and other employee benefits	3,525	2,977	2,725
Occupancy expense, net	1,263	1,279	1,199
Equipment expense	2,115	1,875	1,674
Other expenses	7,115	6,656	7,080
Total noninterest expenses	24,221	22,304	21,594
Income before provision for income taxes	10,544	10,057	9,667
Provision for income taxes	2,033	2,179	1,973
Net income	$ 8,511	$ 7,878	$ 7,694
Earnings per common share	$ 1.91	$ 1.77	$ 1.73
Dividends per common share	$ 1.11	$ 1.08	$ 1.04