Loans, Financing Receivables by Credit Quality Indicator (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Risk Rating by Loan Class [Abstract]
Loans	$ 780,645	$ 775,494	$ 749,196
Pass [Member]
Risk Rating by Loan Class [Abstract]
Loans	744,249	725,886
Special Mention [Member]
Risk Rating by Loan Class [Abstract]
Loans	26,490	27,430
Substandard [Member]
Risk Rating by Loan Class [Abstract]
Loans	9,906	21,728
Doubtful [Member]
Risk Rating by Loan Class [Abstract]
Loans	0	450
Loss [Member]
Risk Rating by Loan Class [Abstract]
Loans	0	0
Commercial [Member]
Risk Rating by Loan Class [Abstract]
Loans	106,140	125,177	135,015
Commercial [Member] | Pass [Member]
Risk Rating by Loan Class [Abstract]
Loans	104,944	121,848
Commercial [Member] | Special Mention [Member]
Risk Rating by Loan Class [Abstract]
Loans	428	66
Commercial [Member] | Substandard [Member]
Risk Rating by Loan Class [Abstract]
Loans	768	2,813
Commercial [Member] | Doubtful [Member]
Risk Rating by Loan Class [Abstract]
Loans	0	450
Commercial [Member] | Loss [Member]
Risk Rating by Loan Class [Abstract]
Loans	0	0
Commercial Real Estate [Member]
Risk Rating by Loan Class [Abstract]
Loans	451,774	420,106	398,346
Commercial Real Estate [Member] | Pass [Member]
Risk Rating by Loan Class [Abstract]
Loans	427,991	395,436
Commercial Real Estate [Member] | Special Mention [Member]
Risk Rating by Loan Class [Abstract]
Loans	17,739	14,272
Commercial Real Estate [Member] | Substandard [Member]
Risk Rating by Loan Class [Abstract]
Loans	6,044	10,398
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	115,751	123,626	113,555
Agriculture [Member] | Pass [Member]
Risk Rating by Loan Class [Abstract]
Loans	105,573	104,809
Agriculture [Member] | Special Mention [Member]
Risk Rating by Loan Class [Abstract]
Loans	7,823	11,750
Agriculture [Member] | Substandard [Member]
Risk Rating by Loan Class [Abstract]
Loans	2,355	7,067
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	64,943	51,064	42,081
Residential Mortgage [Member] | Pass [Member]
Risk Rating by Loan Class [Abstract]
Loans	64,596	50,149
Residential Mortgage [Member] | Special Mention [Member]
Risk Rating by Loan Class [Abstract]
Loans	0	0
Residential Mortgage [Member] | Substandard [Member]
Risk Rating by Loan Class [Abstract]
Loans	347	915
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	15,212	20,124	21,299
Residential Construction [Member] | Pass [Member]
Risk Rating by Loan Class [Abstract]
Loans	15,212	19,372
Residential Construction [Member] | Special Mention [Member]
Risk Rating by Loan Class [Abstract]
Loans	0	752
Residential Construction [Member] | Substandard [Member]
Risk Rating by Loan Class [Abstract]
Loans	0	0
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	26,825	35,397	$ 38,900
Consumer [Member] | Pass [Member]
Risk Rating by Loan Class [Abstract]
Loans	25,933	34,272
Consumer [Member] | Special Mention [Member]
Risk Rating by Loan Class [Abstract]
Loans	500	590
Consumer [Member] | Substandard [Member]
Risk Rating by Loan Class [Abstract]
Loans	392	535
Consumer [Member] | Doubtful [Member]
Risk Rating by Loan Class [Abstract]
Loans	0	0
Consumer [Member] | Loss [Member]
Risk Rating by Loan Class [Abstract]
Loans	$ 0	$ 0