Loans and Allowance for Loan Losses (Schedule of Commercial and Consumer Credit Exposure) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Total	$ 350,303	$ 341,734
Construction [Member]
Total	18,217	18,670
Agricultural Mortgage Loans [Member]
Total	153,034	152,050
Commercial and Industrial Sector [Member]
Total	47,517	41,426
Tax-free loans [Member]
Total	21,770	20,722
Agriculture loans [Member]
Total	18,209	18,794
Commercial [Member]
Total	91,556	90,072
Pass [Member]
Total	332,435	323,225
Pass [Member] | Construction [Member]
Total	16,682	17,670
Pass [Member] | Agricultural Mortgage Loans [Member]
Total	142,476	143,037
Pass [Member] | Commercial and Industrial Sector [Member]
Total	45,616	37,947
Pass [Member] | Tax-free loans [Member]
Total	21,566	20,514
Pass [Member] | Agriculture loans [Member]
Total	17,193	17,798
Pass [Member] | Commercial [Member]
Total	88,902	86,259
Special Mention [Member]
Total	5,965	5,526
Special Mention [Member] | Construction [Member]
Total	535
Special Mention [Member] | Agricultural Mortgage Loans [Member]
Total	4,027	3,873
Special Mention [Member] | Commercial and Industrial Sector [Member]
Total	567	1,015
Special Mention [Member] | Tax-free loans [Member]
Total	204	208
Special Mention [Member] | Agriculture loans [Member]
Total	361	270
Special Mention [Member] | Commercial [Member]
Total	271	160
Substandard [Member]
Total	11,903	12,983
Substandard [Member] | Construction [Member]
Total	1,000	1,000
Substandard [Member] | Agricultural Mortgage Loans [Member]
Total	6,531	5,140
Substandard [Member] | Commercial and Industrial Sector [Member]
Total	1,334	2,464
Substandard [Member] | Tax-free loans [Member]
Total
Substandard [Member] | Agriculture loans [Member]
Total	655	726
Substandard [Member] | Commercial [Member]
Total	2,383	3,653
Doubtful [Member]
Total
Doubtful [Member] | Construction [Member]
Total
Doubtful [Member] | Agricultural Mortgage Loans [Member]
Total
Doubtful [Member] | Commercial and Industrial Sector [Member]
Total
Doubtful [Member] | Tax-free loans [Member]
Total
Doubtful [Member] | Agriculture loans [Member]
Total
Doubtful [Member] | Construction [Member]
Total
Doubtful [Member] | Commercial [Member]
Total
Loss [Member]
Total
Loss [Member] | Construction [Member]
Total
Loss [Member] | Agricultural Mortgage Loans [Member]
Total
Loss [Member] | Commercial and Industrial Sector [Member]
Total
Loss [Member] | Tax-free loans [Member]
Total
Loss [Member] | Agriculture loans [Member]
Total
Loss [Member] | Commercial [Member]
Total