Loans, Financing Receivables by Credit Quality Indicator (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Risk Rating by Loan Class [Abstract]
Loans	$ 775,494	$ 749,196	$ 679,563
Pass [Member]
Risk Rating by Loan Class [Abstract]
Loans	725,886	720,446
Special Mention [Member]
Risk Rating by Loan Class [Abstract]
Loans	27,430	22,938
Substandard [Member]
Risk Rating by Loan Class [Abstract]
Loans	21,728	5,812
Doubtful [Member]
Risk Rating by Loan Class [Abstract]
Loans	450	0
Loss [Member]
Risk Rating by Loan Class [Abstract]
Loans	0	0
Commercial [Member]
Risk Rating by Loan Class [Abstract]
Loans	125,177	135,015	126,311
Commercial [Member] | Pass [Member]
Risk Rating by Loan Class [Abstract]
Loans	121,848	132,846
Commercial [Member] | Special Mention [Member]
Risk Rating by Loan Class [Abstract]
Loans	66	1,050
Commercial [Member] | Substandard [Member]
Risk Rating by Loan Class [Abstract]
Loans	2,813	1,119
Commercial [Member] | Doubtful [Member]
Risk Rating by Loan Class [Abstract]
Loans	450	0
Commercial [Member] | Loss [Member]
Risk Rating by Loan Class [Abstract]
Loans	0	0
Commercial Real Estate [Member]
Risk Rating by Loan Class [Abstract]
Loans	420,106	398,346	344,210
Commercial Real Estate [Member] | Pass [Member]
Risk Rating by Loan Class [Abstract]
Loans	395,436	378,632
Commercial Real Estate [Member] | Special Mention [Member]
Risk Rating by Loan Class [Abstract]
Loans	14,272	16,101
Commercial Real Estate [Member] | Substandard [Member]
Risk Rating by Loan Class [Abstract]
Loans	10,398	3,613
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	123,626	113,555	101,905
Agriculture [Member] | Pass [Member]
Risk Rating by Loan Class [Abstract]
Loans	104,809	110,370
Agriculture [Member] | Special Mention [Member]
Risk Rating by Loan Class [Abstract]
Loans	11,750	3,140
Agriculture [Member] | Substandard [Member]
Risk Rating by Loan Class [Abstract]
Loans	7,067	45
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	51,064	42,081	40,237
Residential Mortgage [Member] | Pass [Member]
Risk Rating by Loan Class [Abstract]
Loans	50,149	39,142
Residential Mortgage [Member] | Special Mention [Member]
Risk Rating by Loan Class [Abstract]
Loans	0	2,147
Residential Mortgage [Member] | Substandard [Member]
Risk Rating by Loan Class [Abstract]
Loans	915	792
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	20,124	21,299	23,650
Residential Construction [Member] | Pass [Member]
Risk Rating by Loan Class [Abstract]
Loans	19,372	21,299
Residential Construction [Member] | Special Mention [Member]
Risk Rating by Loan Class [Abstract]
Loans	752	0
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	35,397	38,900	$ 43,250
Consumer [Member] | Pass [Member]
Risk Rating by Loan Class [Abstract]
Loans	34,272	38,157
Consumer [Member] | Special Mention [Member]
Risk Rating by Loan Class [Abstract]
Loans	590	500
Consumer [Member] | Substandard [Member]
Risk Rating by Loan Class [Abstract]
Loans	535	243
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