Loans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	$ 522,332		$ 522,332		$ 502,463
Allowance for loan losses	7,070		7,070		6,784
Net loans	515,262		515,262		495,679
Individually evaluated for impairment	10,886		10,886		10,418
Collectively evaluated for impairment	511,446		511,446		492,045
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]
Individually evaluated for impairment	598		598		582
Collectively evaluated for impairment	6,472		6,472		6,202
Total	7,070	6,734	7,070	6,734
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	6,989	6,650	6,784	6,487
Charge-offs	(15)	(32)	(58)	(107)
Recoveries	6	11	29	39
Provision	90	105	315	315
Balance at end of period	7,070	6,734	7,070	6,734
Minimum [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Number of days past for loan to be considered impaired, Minimum			90 days
First Mortgage [Member] | Minimum [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Period of mortgage on real estate			15 years
First Mortgage [Member] | Maximum [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Period of mortgage on real estate			30 years
Second Mortgage [Member] | Maximum [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Period of mortgage on real estate			15 years
Real Estate Loans [Member] | Residential [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	183,370		183,370		178,080
Individually evaluated for impairment	482		482		424
Collectively evaluated for impairment	182,888		182,888		177,656
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]
Individually evaluated for impairment	37		37		22
Collectively evaluated for impairment	919		919		853
Total	956	865	956	865
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	934	786	875	805
Charge-offs	(2)	0	(15)	(49)
Recoveries	1	0	3	0
Provision	23	79	93	109
Balance at end of period	956	865	956	865
Real Estate Loans [Member] | Other commercial and agricultural [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	196,446		196,446		194,725
Individually evaluated for impairment	8,594		8,594		9,093
Collectively evaluated for impairment	187,852		187,852		185,632
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]
Individually evaluated for impairment	560		560		559
Collectively evaluated for impairment	3,852		3,852		3,878
Total	4,412	4,231	4,412	4,231
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	4,240	4,405	4,437	4,132
Charge-offs	0	0	0	(2)
Recoveries	0	1	0	7
Provision	172	(175)	(25)	94
Balance at end of period	4,412	4,231	4,412	4,231
Real Estate Loans [Member] | Residential Mortgages [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	115,009		115,009		106,548
Real Estate Loans [Member] | Home Equity [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	68,361		68,361		71,532
Real Estate Loans [Member] | Commercial [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	175,533		175,533		176,710
Real Estate Loans [Member] | Agricultural [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	20,913		20,913		18,015
Real Estate Loans [Member] | Construction [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	18,272		18,272		12,011
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	18,272		18,272		12,011
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	112		112		38
Total	112	26	112	26
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	91	19	38	15
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	21	7	74	11
Balance at end of period	112	26	112	26
Other Commercial and Agricultural Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	54,160		54,160		47,880
Individually evaluated for impairment	1,795		1,795		901
Collectively evaluated for impairment	52,365		52,365		46,979
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]
Individually evaluated for impairment	1		1		1
Collectively evaluated for impairment	963		963		727
Total	964	666	964	666
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	957	685	728	674
Charge-offs	(1)	(20)	(1)	(20)
Recoveries	0	1	0	7
Provision	8	0	237	5
Balance at end of period	964	666	964	666
Consumer [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	9,979		9,979		10,559
Individually evaluated for impairment	15		15		0
Collectively evaluated for impairment	9,964		9,964		10,559
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	114		114		119
Total	114	104	114	104
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	114	108	119	111
Charge-offs	(12)	(12)	(42)	(36)
Recoveries	5	9	26	25
Provision	7	(1)	11	4
Balance at end of period	114	104	114	104
State and Political Subdivision Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	60,105		60,105		59,208
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	60,105		60,105		59,208
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	313		313		271
Total	313	274	313	274
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	310	246	271	235
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	3	28	42	39
Balance at end of period	313	274	313	274
Other Agricultural Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	9,280		9,280		6,260
Unallocated [Member]
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	199		199		316
Total	199	568	199	568
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	343	401	316	515
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	(144)	167	(117)	53
Balance at end of period	$ 199	$ 568	$ 199	$ 568