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Regulatory Restrictions and Capital Ratios (Tables)

12 Months Ended

Dec. 31, 2017

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, 2017:
Tier 1 Leverage Capital
	Auburn National Bancorporation	$	90,382		10.95	%		$	33,012		4.00	%			N/A		N/A
	AuburnBank		89,217		10.82				32,978		4.00			$	41,222		5.00	%
Common Equity Tier 1 Capital
	Auburn National Bancorporation	$	87,382		16.42	%		$	23,949		4.50	%			N/A		N/A
	AuburnBank		89,217		16.74				23,987		4.50			$	34,648		6.50
Tier 1 Risk-Based Capital
	Auburn National Bancorporation	$	90,382		16.98	%		$	31,932		6.00	%			N/A		N/A
	AuburnBank		89,217		16.74				31,983		6.00			$	42,644		8.00	%
Total Risk-Based Capital
	Auburn National Bancorporation	$	95,300		17.91	%		$	42,576		8.00	%			N/A		N/A
	AuburnBank		94,135		17.66				42,644		8.00			$	53,305		10.00	%
At December 31, 2016:
Tier 1 Leverage Capital
	Auburn National Bancorporation	$	85,480		10.27	%		$	33,293		4.00	%			N/A		N/A
	AuburnBank		84,287		10.14				33,259		4.00			$	41,574		5.00	%
Common Equity Tier 1 Capital
	Auburn National Bancorporation	$	82,642		16.44	%		$	22,621		4.50	%			N/A		N/A
	AuburnBank		84,287		16.74				22,663		4.50			$	32,736		6.50
Tier 1 Risk-Based Capital
	Auburn National Bancorporation	$	85,480		17.00	%		$	30,162		6.00	%			N/A		N/A
	AuburnBank		84,287		16.74				30,218		6.00			$	40,290		8.00	%
Total Risk-Based Capital
	Auburn National Bancorporation	$	90,254		17.95	%		$	40,216		8.00	%			N/A		N/A
	AuburnBank		89,061		17.68				40,290		8.00			$	50,363		10.00	%

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- References

No definition available.

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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 1B
-URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826

Reference 2: 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=35709795&loc=SL5958568-112826

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=35709795&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 1G
-URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958577-112826

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