Loans - Internal Risk Rating (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 666,795	$ 633,547
Internal Noninvestment Grade
Financing Receivable, Recorded Investment [Line Items]
Total Loans	573,373	535,415
Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	560,782	510,840
Special mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	10,725	19,831
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,866	4,744
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	68,046	67,360
Agriculture & AG RE
Financing Receivable, Recorded Investment [Line Items]
Total Loans	45,520	50,121
Agriculture & AG RE | Internal Noninvestment Grade
Financing Receivable, Recorded Investment [Line Items]
Total Loans	45,520	50,121
Agriculture & AG RE | Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	45,188	50,121
Agriculture & AG RE | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Agriculture & AG RE | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	332	0
Agriculture & AG RE | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Construction, Land & Development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	32,046	26,016
Construction, Land & Development | Internal Noninvestment Grade
Financing Receivable, Recorded Investment [Line Items]
Total Loans	32,046	26,016
Construction, Land & Development | Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	31,905	25,825
Construction, Land & Development | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	64
Construction, Land & Development | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	141	127
Construction, Land & Development | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Commercial RE
Financing Receivable, Recorded Investment [Line Items]
Total Loans	427,761	391,918
1-4 Family Residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	90,260	95,227
1-4 Family Residential | Senior Lien
Financing Receivable, Recorded Investment [Line Items]
Total Loans	51,261	53,366
1-4 Family Residential | Jr. Lien & Lines of Credit
Financing Receivable, Recorded Investment [Line Items]
Total Loans	38,999	41,861
1-4 Family Residential | Unrated
Financing Receivable, Recorded Investment [Line Items]
Total Loans	84,863	89,699
1-4 Family Residential | Unrated | Senior Lien
Financing Receivable, Recorded Investment [Line Items]
Total Loans	46,719	48,319
1-4 Family Residential | Unrated | Jr. Lien & Lines of Credit
Financing Receivable, Recorded Investment [Line Items]
Total Loans	38,144	41,380
1-4 Family Residential | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,301	4,179
1-4 Family Residential | Special mention | Senior Lien
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,208	4,011
1-4 Family Residential | Special mention | Jr. Lien & Lines of Credit
Financing Receivable, Recorded Investment [Line Items]
Total Loans	93	168
1-4 Family Residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,096	1,349
1-4 Family Residential | Substandard | Senior Lien
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,334	1,036
1-4 Family Residential | Substandard | Jr. Lien & Lines of Credit
Financing Receivable, Recorded Investment [Line Items]
Total Loans	762	313
1-4 Family Residential | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
1-4 Family Residential | Doubtful | Senior Lien
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
1-4 Family Residential | Doubtful | Jr. Lien & Lines of Credit
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Closed-end | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	24,536	24,736
Closed-end | Commercial | Internal Noninvestment Grade
Financing Receivable, Recorded Investment [Line Items]
Total Loans	24,536	24,736
Closed-end | Commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	23,659	24,303
Closed-end | Commercial | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	712	304
Closed-end | Commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	165	129
Closed-end | Commercial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Line of credit | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	43,510	42,624
Line of credit | Commercial | Internal Noninvestment Grade
Financing Receivable, Recorded Investment [Line Items]
Total Loans	43,510	42,624
Line of credit | Commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	42,225	42,374
Line of credit | Commercial | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	740	250
Line of credit | Commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	545	0
Line of credit | Commercial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Owner occupied | Commercial RE
Financing Receivable, Recorded Investment [Line Items]
Total Loans	195,046	172,651
Owner occupied | Commercial RE | Internal Noninvestment Grade
Financing Receivable, Recorded Investment [Line Items]
Total Loans	195,046	172,651
Owner occupied | Commercial RE | Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	192,864	164,538
Owner occupied | Commercial RE | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,931	7,701
Owner occupied | Commercial RE | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	251	412
Owner occupied | Commercial RE | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Non-owner occupied | Commercial RE
Financing Receivable, Recorded Investment [Line Items]
Total Loans	232,715	219,267
Non-owner occupied | Commercial RE | Internal Noninvestment Grade
Financing Receivable, Recorded Investment [Line Items]
Total Loans	232,715	219,267
Non-owner occupied | Commercial RE | Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	224,941	203,679
Non-owner occupied | Commercial RE | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	7,342	11,512
Non-owner occupied | Commercial RE | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	432	4,076
Non-owner occupied | Commercial RE | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 0	$ 0