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Loans and Allowance - Non-accrual loans (Details 2) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	$ 3,779,749	$ 2,777,904	$ 2,713,393
Transfers into non-accrual	3,269,942	6,142,607	3,534,860
Transfers to OREO	(240,098)	(74,400)	(45,175)
Loans paid down/payoffs	(327,132)	(2,891,626)	(2,078,819)
Loans returned to accrual status	(818,396)
Loans charged off	(1,913,143)	(2,174,736)	(1,346,355)
Balance	3,750,922	3,779,749	2,777,904
Commercial and Industrial
Financing Receivable Nonaccrual Status [Roll Forward]
Balance			14,286
Transfers into non-accrual		2,807	261,500
Loans paid down/payoffs			(246,648)
Loans charged off		(2,807)	(29,138)
Commercial Real Estate
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	300,112	1,097,112	1,237,647
Transfers into non-accrual	840,300		1,460,146
Transfers to OREO	(113,893)
Loans paid down/payoffs	(15,392)	(734,000)	(1,357,287)
Loans charged off	(363,822)	(63,000)	(243,394)
Balance	647,305	300,112	1,097,112
Consumer and Indirect
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	596,329	515,352	338,212
Transfers into non-accrual	968,536	1,910,251	1,325,078
Loans paid down/payoffs	(102,038)	(568,741)	(308,926)
Loans returned to accrual status	(311,953)
Loans charged off	(695,242)	(1,260,533)	(839,012)
Balance	455,632	596,329	515,352
Residential Real Estate
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	2,883,308	1,165,440	1,123,248
Transfers into non-accrual	1,461,106	4,229,549	488,136
Transfers to OREO	(126,205)	(74,400)	(45,175)
Loans paid down/payoffs	(209,702)	(1,588,885)	(165,958)
Loans returned to accrual status	(506,443)
Loans charged off	(854,079)	(848,396)	(234,811)
Balance	$ 2,647,985	$ 2,883,308	$ 1,165,440

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Amount of direct write-downs of financing receivables charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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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
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-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5111-111524

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Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

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-Name Accounting Standards Codification
-Topic 230
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-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586

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