Loans - Internal Risk Rating (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 688,092	$ 685,775
Commercial Loan Portfolio | Internal Noninvestment Grade
Financing Receivable, Recorded Investment [Line Items]
Total Loans	602,214	597,505
Commercial Loan Portfolio | Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	591,122	586,894
Commercial Loan Portfolio | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,809	6,665
Commercial Loan Portfolio | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	4,283	3,946
Commercial Loan Portfolio | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Retail Residential Loan Portfolio
Financing Receivable, Recorded Investment [Line Items]
Total Loans	82,809	85,152
Retail Residential Loan Portfolio | Senior Lien
Financing Receivable, Recorded Investment [Line Items]
Total Loans	45,772	46,830
Retail Residential Loan Portfolio | Jr. Lien & Lines of Credit
Financing Receivable, Recorded Investment [Line Items]
Total Loans	37,037	38,322
Retail Residential Loan Portfolio | Unrated
Financing Receivable, Recorded Investment [Line Items]
Total Loans	78,182	80,333
Retail Residential Loan Portfolio | Unrated | Senior Lien
Financing Receivable, Recorded Investment [Line Items]
Total Loans	41,704	42,772
Retail Residential Loan Portfolio | Unrated | Jr. Lien & Lines of Credit
Financing Receivable, Recorded Investment [Line Items]
Total Loans	36,478	37,561
Retail Residential Loan Portfolio | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	163	102
Retail Residential Loan Portfolio | Special mention | Senior Lien
Financing Receivable, Recorded Investment [Line Items]
Total Loans	78	89
Retail Residential Loan Portfolio | Special mention | Jr. Lien & Lines of Credit
Financing Receivable, Recorded Investment [Line Items]
Total Loans	85	13
Retail Residential Loan Portfolio | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	4,464	4,717
Retail Residential Loan Portfolio | Substandard | Senior Lien
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,990	3,969
Retail Residential Loan Portfolio | Substandard | Jr. Lien & Lines of Credit
Financing Receivable, Recorded Investment [Line Items]
Total Loans	474	748
Retail Residential Loan Portfolio | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Retail Residential Loan Portfolio | Doubtful | Senior Lien
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Retail Residential Loan Portfolio | Doubtful | Jr. Lien & Lines of Credit
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Commercial - Closed-End | Commercial Loan Portfolio
Financing Receivable, Recorded Investment [Line Items]
Total Loans	27,355	25,846
Commercial - Closed-End | Commercial Loan Portfolio | Internal Noninvestment Grade
Financing Receivable, Recorded Investment [Line Items]
Total Loans	27,355	25,846
Commercial - Closed-End | Commercial Loan Portfolio | Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	26,521	24,984
Commercial - Closed-End | Commercial Loan Portfolio | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	674	687
Commercial - Closed-End | Commercial Loan Portfolio | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	160	175
Commercial - Closed-End | Commercial Loan Portfolio | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Commercial - Lines of Credit | Commercial Loan Portfolio
Financing Receivable, Recorded Investment [Line Items]
Total Loans	64,649	54,441
Commercial - Lines of Credit | Commercial Loan Portfolio | Internal Noninvestment Grade
Financing Receivable, Recorded Investment [Line Items]
Total Loans	64,649	54,441
Commercial - Lines of Credit | Commercial Loan Portfolio | Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	63,072	53,256
Commercial - Lines of Credit | Commercial Loan Portfolio | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	764	764
Commercial - Lines of Credit | Commercial Loan Portfolio | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	813	421
Commercial - Lines of Credit | Commercial Loan Portfolio | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Agriculture & AG RE | Commercial Loan Portfolio
Financing Receivable, Recorded Investment [Line Items]
Total Loans	45,283	49,121
Agriculture & AG RE | Commercial Loan Portfolio | Internal Noninvestment Grade
Financing Receivable, Recorded Investment [Line Items]
Total Loans	45,283	49,121
Agriculture & AG RE | Commercial Loan Portfolio | Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	45,283	49,121
Agriculture & AG RE | Commercial Loan Portfolio | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Agriculture & AG RE | Commercial Loan Portfolio | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Agriculture & AG RE | Commercial Loan Portfolio | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Construction, Land & Development | Commercial Loan Portfolio
Financing Receivable, Recorded Investment [Line Items]
Total Loans	25,994	28,771
Construction, Land & Development | Commercial Loan Portfolio | Internal Noninvestment Grade
Financing Receivable, Recorded Investment [Line Items]
Total Loans	25,994	28,771
Construction, Land & Development | Commercial Loan Portfolio | Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	25,901	28,652
Construction, Land & Development | Commercial Loan Portfolio | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Construction, Land & Development | Commercial Loan Portfolio | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	93	119
Construction, Land & Development | Commercial Loan Portfolio | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Commercial Real Estate - Owner-Occupied | Commercial Loan Portfolio
Financing Receivable, Recorded Investment [Line Items]
Total Loans	190,955	195,999
Commercial Real Estate - Owner-Occupied | Commercial Loan Portfolio | Internal Noninvestment Grade
Financing Receivable, Recorded Investment [Line Items]
Total Loans	190,955	195,999
Commercial Real Estate - Owner-Occupied | Commercial Loan Portfolio | Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	187,274	194,458
Commercial Real Estate - Owner-Occupied | Commercial Loan Portfolio | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,532	1,390
Commercial Real Estate - Owner-Occupied | Commercial Loan Portfolio | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	149	151
Commercial Real Estate - Owner-Occupied | Commercial Loan Portfolio | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Commercial Real Estate - Non-Owner Occupied | Commercial Loan Portfolio
Financing Receivable, Recorded Investment [Line Items]
Total Loans	247,978	243,327
Commercial Real Estate - Non-Owner Occupied | Commercial Loan Portfolio | Internal Noninvestment Grade
Financing Receivable, Recorded Investment [Line Items]
Total Loans	247,978	243,327
Commercial Real Estate - Non-Owner Occupied | Commercial Loan Portfolio | Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	243,071	236,423
Commercial Real Estate - Non-Owner Occupied | Commercial Loan Portfolio | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,839	3,824
Commercial Real Estate - Non-Owner Occupied | Commercial Loan Portfolio | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,068	3,080
Commercial Real Estate - Non-Owner Occupied | Commercial Loan Portfolio | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 0	$ 0