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Regulatory Restrictions and Capital Ratios (Tables)

12 Months Ended

Dec. 31, 2012

Regulatory Capital Requirements [Abstract]

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]

								Minimum for capital						Minimum to be
		Actual						adequacy purposes						well capitalized
(Dollars in thousands)			Amount		Ratio				Amount		Ratio				Amount		Ratio
At December 31, 2012:
Tier 1 Leverage Capital
	Auburn National Bancorporation	$	71,982		9.58	%		$	30,069		4.00	%			N/A		N/A
	AuburnBank		71,277		9.50				30,011		4.00			$	37,514		5.00	%
Tier 1 Risk-Based Capital
	Auburn National Bancorporation	$	71,982		16.20	%		$	17,768		4.00	%			N/A		N/A
	AuburnBank		71,277		16.02				17,794		4.00			$	26,691		6.00	%
Total Risk-Based Capital
	Auburn National Bancorporation	$	77,558		17.46	%		$	35,536		8.00	%			N/A		N/A
	AuburnBank		76,853		17.28				35,588		8.00			$	44,485		10.00	%
At December 31, 2011:
Tier 1 Leverage Capital
	Auburn National Bancorporation	$	68,220		8.82	%		$	30,927		4.00	%			N/A		N/A
	AuburnBank		67,542		8.75				30,868		4.00			$	38,585		5.00	%
Tier 1 Risk-Based Capital
	Auburn National Bancorporation	$	68,220		15.40	%		$	17,715		4.00	%			N/A		N/A
	AuburnBank		67,542		15.23				17,742		4.00			$	26,614		6.00	%
Total Risk-Based Capital
	Auburn National Bancorporation	$	73,800		16.66	%		$	35,430		8.00	%			N/A		N/A
	AuburnBank		73,122		16.49				35,485		8.00			$	44,356		10.00	%

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- Definition

Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 505

-Section 50

-Paragraph 1G

-URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958577-112826



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

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 18

-IssueDate 2006-05-01

-Chapter 17

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 505

-Section 50

-Paragraph 1H

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 505

-Section 50

-Paragraph 1

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 505

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958570-112826

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