Loans and Allowance for Loan Losses, Loan Portfolio Based on Internal Rating Category (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	$ 588,160	$ 601,902
1 (Pass) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	530,751	544,956
2 (Watch) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	44,905	44,662
3 (Special Mention) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	2,282	3,207
4 (Substandard) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	10,222	9,077
Construction & Development [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	96,810	87,267
Construction & Development [Member] | 1 (Pass) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	94,613	84,485
Construction & Development [Member] | 2 (Watch) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	2,197	2,782
Construction & Development [Member] | 3 (Special Mention) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	0	0
Construction & Development [Member] | 4 (Substandard) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	0	0
1-4 Family Commercial [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	33,943	33,278
1-4 Family Commercial [Member] | 1 (Pass) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	32,887	29,942
1-4 Family Commercial [Member] | 2 (Watch) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	942	3,221
1-4 Family Commercial [Member] | 3 (Special Mention) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	0	0
1-4 Family Commercial [Member] | 4 (Substandard) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	114	115
Commercial Real Estate - Other [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	156,664	156,396
Commercial Real Estate - Other [Member] | 1 (Pass) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	154,720	154,353
Commercial Real Estate - Other [Member] | 2 (Watch) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	0	1,559
Commercial Real Estate - Other [Member] | 3 (Special Mention) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	0	0
Commercial Real Estate - Other [Member] | 4 (Substandard) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	1,944	484
Commercial & Industrial [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	230,326	248,394
Commercial & Industrial [Member] | 1 (Pass) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	183,486	204,671
Commercial & Industrial [Member] | 2 (Watch) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	41,165	36,342
Commercial & Industrial [Member] | 3 (Special Mention) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	0	0
Commercial & Industrial [Member] | 4 (Substandard) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	5,675	7,381
Agricultural [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	57,021	62,844
Agricultural [Member] | 1 (Pass) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	51,938	57,782
Agricultural [Member] | 2 (Watch) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	601	758
Agricultural [Member] | 3 (Special Mention) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	2,282	3,207
Agricultural [Member] | 4 (Substandard) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	2,200	1,097
Consumer [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	13,396	13,723
Consumer [Member] | 1 (Pass) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	13,107	13,723
Consumer [Member] | 2 (Watch) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	0	0
Consumer [Member] | 3 (Special Mention) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	0	0
Consumer [Member] | 4 (Substandard) [Member]
Loans Portfolio based on Internal Rating [Abstract]
Gross loans	$ 289	$ 0