Loans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	$ 533,223		$ 540,612
Allowance for loan losses	7,233		7,098
Net loans	525,990		533,514
Individually evaluated for impairment	10,814		10,400
Collectively evaluated for impairment	522,409		530,212
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	676		333
Collectively evaluated for impairment	6,557		6,765
Total	7,233	6,928
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	7,098	6,784
Charge-offs	(56)	(20)
Recoveries	11	14
Provision	180	150
Balance at end of period	7,233	6,928
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	185,904		187,101
Individually evaluated for impairment	335		342
Collectively evaluated for impairment	185,569		186,759
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	27		27
Collectively evaluated for impairment	859		919
Total	886	913
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	946	875
Charge-offs	(38)	0
Recoveries	0	2
Provision	(22)	36
Balance at end of period	886	913
Real Estate Loans [Member] | Commercial and Agricultural [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	214,030		215,088
Individually evaluated for impairment	8,441		8,310
Collectively evaluated for impairment	205,589		206,778
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	504		305
Collectively evaluated for impairment	4,026		4,253
Total	4,530	4,416
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	4,558	4,437
Charge-offs	(10)	0
Recoveries	2	0
Provision	(20)	(21)
Balance at end of period	4,530	4,416
Real Estate Loans [Member] | Residential Mortgages [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	120,997		119,884
Real Estate Loans [Member] | Home Equity [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	64,907		67,217
Real Estate Loans [Member] | Commercial [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	192,785		193,087
Real Estate Loans [Member] | Agricultural [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	21,245		22,001
Real Estate Loans [Member] | Construction [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	3,510		8,937
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	3,510		8,937
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
Collectively evaluated for impairment	8		50
Total	8	78
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	50	38
Charge-offs	0	0
Recoveries	0	0
Provision	(42)	40
Balance at end of period	8	78
Other Commercial and Agricultural Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	55,468		54,029
Individually evaluated for impairment	2,023		1,733
Collectively evaluated for impairment	53,445		52,296
Consumer [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	9,056		9,563
Individually evaluated for impairment	15		15
Collectively evaluated for impairment	9,041		9,548
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
Collectively evaluated for impairment	83		105
Total	83	118
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	105	119
Charge-offs	(8)	(20)
Recoveries	9	12
Provision	(23)	7
Balance at end of period	83	118
Commercial and Other Loans [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	145		1
Collectively evaluated for impairment	1,028		941
Total	1,173	700
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	942	728
Charge-offs	0	0
Recoveries	0	0
Provision	231	(28)
Balance at end of period	1,173	700
State and Political Subdivision Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	65,255		65,894
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	65,255		65,894
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
Collectively evaluated for impairment	396		330
Total	396	303
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	330	271
Charge-offs	0	0
Recoveries	0	0
Provision	66	32
Balance at end of period	396	303
Other Agricultural Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total Loans	9,455		9,541
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
Collectively evaluated for impairment	157		167
Total	157	400
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	167	316
Charge-offs	0	0
Recoveries	0	0
Provision	(10)	84
Balance at end of period	$ 157	$ 400