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Loans and Allowance - Past Due Financing Receivables (Details 4) - USD ($)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 259,529,173	$ 258,093,183	$ 272,664,631
Non-accrual	3,750,922	3,779,749	2,777,904	$ 2,713,393
Total	266,106,276	263,857,691	278,230,503
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,789,915	1,929,997	2,591,196
90 Days or More and Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	36,266	54,762	196,772
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	4,679,475	4,539,701	3,518,752
Non-accrual				14,286
Total	4,679,475	4,539,701	3,518,752
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	68,774,559	64,270,345	64,545,207
Non-accrual	647,305	300,112	1,097,112	1,237,647
Total	69,421,864	64,571,733	65,642,632
Commercial real estate | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		1,276	313
Consumer and indirect
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	82,133,896	73,568,010	81,315,689
Non-accrual	455,632	596,329	515,352	338,212
Total	83,581,052	75,302,771	84,103,142
Consumer and indirect | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	991,524	1,122,155	2,272,101
Consumer and indirect | 90 Days or More and Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		16,277
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	103,941,243	115,715,127	123,284,983
Non-accrual	2,647,985	2,883,308	1,165,440	$ 1,123,248
Total	108,423,885	119,443,486	124,965,977
Residential real estate | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,798,391	806,566	318,782
Residential real estate | 90 Days or More and Still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 36,266	$ 38,485	$ 196,772

X

- Definition

Financing receivables that are current.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953401-111524

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- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5111-111524

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- Definition

Recorded Investment in financing receivables that are past due at the balance sheet date.

+ 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953401-111524

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

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