Loans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	$ 515,736		$ 515,736		$ 502,463
Allowance for loan losses	6,989		6,989		6,784
Net loans	508,747		508,747		495,679
Individually evaluated for impairment	10,593		10,593		10,418
Collectively evaluated for impairment	505,143		505,143		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	537		537		582
Collectively evaluated for impairment	6,452		6,452		6,202
Total	6,989	6,650	6,989	6,650
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	6,928	6,545	6,784	6,487
Charge-offs	(23)	(16)	(43)	(75)
Recoveries	9	16	23	28
Provision	75	105	225	210
Balance at end of period	6,989	6,650	6,989	6,650
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] | Mortgages [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	180,782		180,782		178,080
Individually evaluated for impairment	487		487		424
Collectively evaluated for impairment	180,295		180,295		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	38		38		22
Collectively evaluated for impairment	896		896		853
Total	934	786	934	786
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	913	753	875	805
Charge-offs	(13)	0	(13)	(49)
Recoveries	0	0	2	0
Provision	34	33	70	30
Balance at end of period	934	786	934	786
Real Estate Loans [Member] | Other commercial and agricultural [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	198,127		198,127		194,725
Individually evaluated for impairment	8,332		8,332		9,093
Collectively evaluated for impairment	189,795		189,795		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	499		499		559
Collectively evaluated for impairment	3,741		3,741		3,878
Total	4,240	4,405	4,240	4,405
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	4,416	4,336	4,437	4,132
Charge-offs	0	0	0	(2)
Recoveries	0	6	0	6
Provision	(176)	63	(197)	269
Balance at end of period	4,240	4,405	4,240	4,405
Real Estate Loans [Member] | Residential Mortgages [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	111,940		111,940		106,548
Real Estate Loans [Member] | Home Equity [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	68,842		68,842		71,532
Real Estate Loans [Member] | Commercial [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	178,480		178,480		176,710
Real Estate Loans [Member] | Agricultural [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	19,647		19,647		18,015
Real Estate Loans [Member] | Construction [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	13,455		13,455		12,011
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	13,455		13,455		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	91		91		38
Total	91	19	91	19
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	78	16	38	15
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	13	3	53	4
Balance at end of period	91	19	91	19
Other Commercial and Agricultural Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	54,073		54,073		47,880
Individually evaluated for impairment	1,774		1,774		901
Collectively evaluated for impairment	52,299		52,299		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	0		0		1
Collectively evaluated for impairment	957		957		727
Total	957	685	957	685
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	700	671	728	674
Charge-offs	0	0	0	0
Recoveries	0	3	0	6
Provision	257	11	229	5
Balance at end of period	957	685	957	685
Consumer [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	10,062		10,062		10,559
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	10,062		10,062		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	108	114	108
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	118	96	119	111
Charge-offs	(10)	(16)	(30)	(24)
Recoveries	9	7	21	16
Provision	(3)	21	4	5
Balance at end of period	114	108	114	108
State and Political Subdivision Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	59,237		59,237		59,208
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	59,237		59,237		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	310		310		271
Total	310	246	310	246
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	303	245	271	235
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	7	1	39	11
Balance at end of period	310	246	310	246
Other Agricultural Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	9,415		9,415		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	343		343		316
Total	343	401	343	401
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	400	428	316	515
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	(57)	(27)	27	(114)
Balance at end of period	$ 343	$ 401	$ 343	$ 401