Loans, Financing Receivables by Credit Quality Indicator (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Risk rating by loan class [Abstract]
Loans	$ 448,228	$ 442,999
Allowance for loan losses [Roll Forward]
Beginning balance	10,408	11,039	11,916
Provision for loan losses	3,276	5,138	4,914
Charge-offs	(5,895)	(6,642)	(6,616)
Recoveries	765	873	825
Net charge-offs	(5,130)	(5,769)	(5,791)
Ending balance	8,554	10,408	11,039
Allowance for loan loss allocations for impairments [Abstract]
Loans individually evaluated for impairment	1,072	1,648	1,282
Loans collectively evaluated for impairment	7,482	8,760	9,757
Ending balance	8,554	10,408	11,039
Loans individually and collectively evaluated for impairment [Abstract]
Loans individually evaluated for impairment	13,381	18,226	20,165
Loans collectively evaluated for impairment	434,847	424,773	433,062
Ending Balance	448,228	442,999	453,227
Pass [Member]
Risk rating by loan class [Abstract]
Loans	401,285	374,100
Special Mention [Member]
Risk rating by loan class [Abstract]
Loans	20,252	30,517
Substandard [Member]
Risk rating by loan class [Abstract]
Loans	26,618	37,945
Doubtful [Member]
Risk rating by loan class [Abstract]
Loans	73	437
Loss [Member]
Risk rating by loan class [Abstract]
Loans	0	0
Commercial [Member]
Risk rating by loan class [Abstract]
Loans	88,810	91,914
Allowance for loan losses [Roll Forward]
Beginning balance	3,598	3,761	4,036
Provision for loan losses	2,493	2,033	1,115
Charge-offs	(3,498)	(2,381)	(1,930)
Recoveries	306	185	540
Net charge-offs	(3,192)	(2,196)	(1,390)
Ending balance	2,899	3,598	3,761
Allowance for loan loss allocations for impairments [Abstract]
Loans individually evaluated for impairment	95	101	89
Loans collectively evaluated for impairment	2,804	3,497	3,672
Ending balance	2,899	3,598	3,761
Loans individually and collectively evaluated for impairment [Abstract]
Loans individually evaluated for impairment	3,288	3,488	2,994
Loans collectively evaluated for impairment	85,522	88,426	79,821
Ending Balance	88,810	91,914	82,815
Commercial [Member] | Pass [Member]
Risk rating by loan class [Abstract]
Loans	78,078	71,229
Commercial [Member] | Special Mention [Member]
Risk rating by loan class [Abstract]
Loans	4,393	8,444
Commercial [Member] | Substandard [Member]
Risk rating by loan class [Abstract]
Loans	6,339	11,804
Commercial [Member] | Doubtful [Member]
Risk rating by loan class [Abstract]
Loans	0	437
Commercial [Member] | Loss [Member]
Risk rating by loan class [Abstract]
Loans	0	0
Commercial Real Estate [Member]
Risk rating by loan class [Abstract]
Loans	188,426	175,793
Allowance for loan losses [Roll Forward]
Beginning balance	1,747	1,957	2,706
Provision for loan losses	351	1,502	741
Charge-offs	(375)	(2,000)	(1,491)
Recoveries	0	288	1
Net charge-offs	(375)	(1,712)	(1,490)
Ending balance	1,723	1,747	1,957
Allowance for loan loss allocations for impairments [Abstract]
Loans individually evaluated for impairment	26	22	22
Loans collectively evaluated for impairment	1,697	1,725	1,935
Ending balance	1,723	1,747	1,957
Loans individually and collectively evaluated for impairment [Abstract]
Loans individually evaluated for impairment	3,042	4,269	7,088
Loans collectively evaluated for impairment	185,384	171,524	179,317
Ending Balance	188,426	175,793	186,405
Commercial Real Estate [Member] | Pass [Member]
Risk rating by loan class [Abstract]
Loans	170,676	148,317
Commercial Real Estate [Member] | Special Mention [Member]
Risk rating by loan class [Abstract]
Loans	9,049	16,492
Commercial Real Estate [Member] | Substandard [Member]
Risk rating by loan class [Abstract]
Loans	8,701	10,984
Commercial Real Estate [Member] | Doubtful [Member]
Risk rating by loan class [Abstract]
Loans	0	0
Commercial Real Estate [Member] | Loss [Member]
Risk rating by loan class [Abstract]
Loans	0	0
Agriculture [Member]
Risk rating by loan class [Abstract]
Loans	52,747	52,064
Allowance for loan losses [Roll Forward]
Beginning balance	1,934	2,141	1,681
Provision for loan losses	(907)	511	1,118
Charge-offs	(116)	(860)	(736)
Recoveries	4	142	78
Net charge-offs	(112)	(718)	(658)
Ending balance	915	1,934	2,141
Allowance for loan loss allocations for impairments [Abstract]
Loans individually evaluated for impairment	0	0	41
Loans collectively evaluated for impairment	915	1,934	2,100
Ending balance	915	1,934	2,141
Loans individually and collectively evaluated for impairment [Abstract]
Loans individually evaluated for impairment	0	3,598	2,135
Loans collectively evaluated for impairment	52,747	48,466	50,905
Ending Balance	52,747	52,064	53,040
Agriculture [Member] | Pass [Member]
Risk rating by loan class [Abstract]
Loans	49,613	48,330
Agriculture [Member] | Special Mention [Member]
Risk rating by loan class [Abstract]
Loans	172	0
Agriculture [Member] | Substandard [Member]
Risk rating by loan class [Abstract]
Loans	2,962	3,734
Agriculture [Member] | Doubtful [Member]
Risk rating by loan class [Abstract]
Loans	0	0
Agriculture [Member] | Loss [Member]
Risk rating by loan class [Abstract]
Loans	0	0
Residential Mortgage [Member]
Risk rating by loan class [Abstract]
Loans	51,266	51,586
Allowance for loan losses [Roll Forward]
Beginning balance	1,135	830	735
Provision for loan losses	877	566	788
Charge-offs	(864)	(272)	(715)
Recoveries	0	11	22
Net charge-offs	(864)	(261)	(693)
Ending balance	1,148	1,135	830
Allowance for loan loss allocations for impairments [Abstract]
Loans individually evaluated for impairment	417	731	543
Loans collectively evaluated for impairment	731	404	287
Ending balance	1,148	1,135	830
Loans individually and collectively evaluated for impairment [Abstract]
Loans individually evaluated for impairment	4,823	5,069	6,033
Loans collectively evaluated for impairment	46,443	46,517	46,314
Ending Balance	51,266	51,586	52,347
Residential Mortgage [Member] | Pass [Member]
Risk rating by loan class [Abstract]
Loans	45,962	42,845
Residential Mortgage [Member] | Special Mention [Member]
Risk rating by loan class [Abstract]
Loans	604	1,830
Residential Mortgage [Member] | Substandard [Member]
Risk rating by loan class [Abstract]
Loans	4,700	6,911
Residential Mortgage [Member] | Doubtful [Member]
Risk rating by loan class [Abstract]
Loans	0	0
Residential Mortgage [Member] | Loss [Member]
Risk rating by loan class [Abstract]
Loans	0	0
Residential Construction [Member]
Risk rating by loan class [Abstract]
Loans	7,586	7,492
Allowance for loan losses [Roll Forward]
Beginning balance	1,198	1,719	1,611
Provision for loan losses	(648)	(395)	932
Charge-offs	(167)	(197)	(830)
Recoveries	341	71	6
Net charge-offs	174	(126)	(824)
Ending balance	724	1,198	1,719
Allowance for loan loss allocations for impairments [Abstract]
Loans individually evaluated for impairment	433	668	575
Loans collectively evaluated for impairment	291	530	1,144
Ending balance	724	1,198	1,719
Loans individually and collectively evaluated for impairment [Abstract]
Loans individually evaluated for impairment	1,097	1,147	1,621
Loans collectively evaluated for impairment	6,489	6,345	8,625
Ending Balance	7,586	7,492	10,246
Residential Construction [Member] | Pass [Member]
Risk rating by loan class [Abstract]
Loans	5,512	5,140
Residential Construction [Member] | Special Mention [Member]
Risk rating by loan class [Abstract]
Loans	1,212	927
Residential Construction [Member] | Substandard [Member]
Risk rating by loan class [Abstract]
Loans	862	1,425
Residential Construction [Member] | Doubtful [Member]
Risk rating by loan class [Abstract]
Loans	0	0
Residential Construction [Member] | Loss [Member]
Risk rating by loan class [Abstract]
Loans	0	0
Consumer [Member]
Risk rating by loan class [Abstract]
Loans	59,393	64,150
Allowance for loan losses [Roll Forward]
Beginning balance	796	556	506
Provision for loan losses	1,075	996	786
Charge-offs	(875)	(932)	(914)
Recoveries	114	176	178
Net charge-offs	(761)	(756)	(736)
Ending balance	1,110	796	556
Allowance for loan loss allocations for impairments [Abstract]
Loans individually evaluated for impairment	101	126	12
Loans collectively evaluated for impairment	1,009	670	544
Ending balance	1,110	796	556
Loans individually and collectively evaluated for impairment [Abstract]
Loans individually evaluated for impairment	1,131	655	294
Loans collectively evaluated for impairment	58,262	63,495	68,080
Ending Balance	59,393	64,150	68,374
Consumer [Member] | Pass [Member]
Risk rating by loan class [Abstract]
Loans	51,444	58,239
Consumer [Member] | Special Mention [Member]
Risk rating by loan class [Abstract]
Loans	4,822	2,824
Consumer [Member] | Substandard [Member]
Risk rating by loan class [Abstract]
Loans	3,054	3,087
Consumer [Member] | Doubtful [Member]
Risk rating by loan class [Abstract]
Loans	73	0
Consumer [Member] | Loss [Member]
Risk rating by loan class [Abstract]
Loans	0	0
Unallocated [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	0	75	641
Provision for loan losses	35	(75)	(566)
Charge-offs	0	0	0
Recoveries	0	0	0
Net charge-offs	0	0	0
Ending balance	35	0	75
Allowance for loan loss allocations for impairments [Abstract]
Loans individually evaluated for impairment	0	0	0
Loans collectively evaluated for impairment	35	0	75
Ending balance	$ 35	$ 0	$ 75