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Loans and Allowance - Risk Ratings of Loans by Categories of Loans (Details 3)	12 Months Ended
	Dec. 31, 2016 USD ($) Contract	Dec. 31, 2015 USD ($) Contract	Dec. 31, 2014 USD ($) Contract	Dec. 31, 2013 USD ($)
Financing Receivable, Recorded Investment [Line Items]
Total	$ 266,106,276	$ 263,857,691	$ 278,230,503
Non-accrual	3,750,922	3,779,749	2,777,904	$ 2,713,393
Troubled debt restructures	$ 312,445	$ 290,368	$ 252,500
Number of TDRs accounts | Contract	3	2	1
Pass
Financing Receivable, Recorded Investment [Line Items]
Total	$ 256,733,659	$ 251,884,584	$ 263,761,195
Special mention
Financing Receivable, Recorded Investment [Line Items]
Total	4,697,918	6,782,290	8,126,375
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	4,460,669	4,493,978	6,017,072
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	214,030	696,839	162,960
Loss
Financing Receivable, Recorded Investment [Line Items]
Total			162,901
Non-performing TDRs
Financing Receivable, Recorded Investment [Line Items]
Total	$ 83,945
Number of TDRs accounts | Contract	2
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Total	$ 4,679,475	4,539,701	3,518,752
Non-accrual				14,286
Troubled debt restructures	$ 228,500	$ 240,500	$ 252,500
Number of TDRs accounts | Contract	1	1	1
Commercial and Industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	$ 4,357,475	$ 3,878,588	$ 3,177,639
Commercial and Industrial | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total	93,500	168,113	88,613
Commercial and Industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	228,500	493,000	252,500
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total	69,421,864	64,571,733	65,642,632
Non-accrual	647,305	300,112	1,097,112	1,237,647
Commercial Real Estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	64,207,732	58,706,189	58,837,254
Commercial Real Estate | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total	3,801,217	4,422,115	4,649,562
Commercial Real Estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	1,412,915	1,443,429	2,155,816
Consumer and Indirect
Financing Receivable, Recorded Investment [Line Items]
Total	83,581,052	75,302,771	84,103,142
Non-accrual	455,632	596,329	515,352	338,212
Troubled debt restructures	$ 35,814
Number of TDRs accounts | Contract	1
Consumer and Indirect | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	$ 82,942,573	72,975,858	80,501,928
Consumer and Indirect | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total	276,012	1,652,579	2,555,654
Consumer and Indirect | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	326,653	509,211	882,600
Consumer and Indirect | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	35,814	165,123	162,960
Consumer and Indirect | Non-performing TDRs
Financing Receivable, Recorded Investment [Line Items]
Total	$ 35,814
Number of TDRs accounts | Contract	1
Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total	$ 108,423,885	119,443,486	124,965,977
Non-accrual	2,647,985	2,883,308	1,165,440	$ 1,123,248
Troubled debt restructures	$ 48,131	$ 49,868
Number of TDRs accounts | Contract	1	1
Residential Real Estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	$ 105,225,879	$ 116,323,949	121,244,374
Residential Real Estate | Special mention
Financing Receivable, Recorded Investment [Line Items]
Total	527,189	539,483	832,546
Residential Real Estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	2,492,601	2,048,338	2,726,156
Residential Real Estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	178,216	$ 531,716
Residential Real Estate | Loss
Financing Receivable, Recorded Investment [Line Items]
Total			$ 162,901
Residential Real Estate | Non-performing TDRs
Financing Receivable, Recorded Investment [Line Items]
Total	$ 48,131
Number of TDRs accounts | Contract	1

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 45
-Paragraph 2
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