Fair Value of Financial Instruments (Details) (USD $)	6 Months Ended	12 Months Ended
Jun. 30, 2012	Dec. 31, 2011
Securities available for sale:
Securities available for sale	$ 334,523,000	$ 333,366,000
Fair value measurements using significant unobservable inputs (Level 3) [Rollforward]
Balances, beginning of period	324,000
Total Realized / Unrealized Gains (Losses) Included in Net Income	13,000
Total Realized / Unrealized Gains (Losses) Included in Other Comprehensive Income	0
Purchases, Sales, Issuances and Settlements, Net	0
Transfer In (Out) of Level 3	0
Balances, end of period	337,000	324,000
Number of years an appraisal of real estate property, minimum	2 years
Financial Assets:
Securities available for sale	334,523,000	333,366,000
Financial Liabilities:
Number of level 3 securities	1
Percentage of fair value estimation of security (in hundredths)		67.28%
Par value on which estimation of fair value of security is based		500,000
Estimated amount of fair value of security		336,000
Amount of impairment attributed to factors other than credit		147,000
Amount of impairment attributable to credit factors		17,000
Carrying Value [Member]
Securities available for sale:
Securities available for sale	334,523,000	333,366,000
Assets:
Loans held for sale	9,215,000	6,330,000
Financial Assets:
Cash and cash equivalents	28,909,000	28,893,000
Securities available for sale	334,523,000	333,366,000
Loans held for sale	9,215,000	6,330,000
Loans, net of allowance	795,970,000	814,229,000
Bank owned life insurance	13,273,000	13,058,000
Accrued interest receivable	5,106,000	5,091,000
Financial Liabilities:
Deposits	1,042,485,000	1,058,754,000
Repurchase agreements	46,113,000	45,575,000
Other borrowings	10,142,000	13,206,000
Trust preferred capital notes	27,267,000	27,212,000
Accrued interest payable	758,000	857,000
Fair Value [Member]
Securities available for sale:
Securities available for sale	334,523,000	333,366,000
Assets:
Loans held for sale	9,215,000	6,330,000
Financial Assets:
Cash and cash equivalents	28,909,000	28,893,000
Securities available for sale	334,523,000	333,366,000
Loans held for sale	9,215,000	6,330,000
Loans, net of allowance	787,894,000	811,573,000
Bank owned life insurance	13,273,000	13,058,000
Accrued interest receivable	5,106,000	5,091,000
Financial Liabilities:
Deposits	1,020,830,000	1,066,448,000
Repurchase agreements	46,113,000	45,575,000
Other borrowings	11,078,000	13,064,000
Trust preferred capital notes	23,032,000	27,184,000
Accrued interest payable	758,000	857,000
Federal agencies and GSEs [Member]
Securities available for sale:
Securities available for sale	37,177,000	32,679,000
Financial Assets:
Securities available for sale	37,177,000	32,679,000
Mortgage-backed and CMOs [Member]
Securities available for sale:
Securities available for sale	96,882,000	103,904,000
Financial Assets:
Securities available for sale	96,882,000	103,904,000
State and municipal [Member]
Securities available for sale:
Securities available for sale	192,022,000	194,405,000
Financial Assets:
Securities available for sale	192,022,000	194,405,000
Corporate [Member]
Securities available for sale:
Securities available for sale	8,442,000	2,378,000
Fair value measurements using significant unobservable inputs (Level 3) [Rollforward]
Balances, beginning of period	324,000
Total Realized / Unrealized Gains (Losses) Included in Net Income	13,000
Total Realized / Unrealized Gains (Losses) Included in Other Comprehensive Income	0
Purchases, Sales, Issuances and Settlements, Net	0
Transfer In (Out) of Level 3	0
Balances, end of period	337,000
Financial Assets:
Securities available for sale	8,442,000	2,378,000
Recurring [Member]
Securities available for sale:
Securities available for sale	334,523,000	333,366,000
Financial Assets:
Securities available for sale	334,523,000	333,366,000
Recurring [Member] \| Federal agencies and GSEs [Member]
Securities available for sale:
Securities available for sale	37,177,000	32,679,000
Financial Assets:
Securities available for sale	37,177,000	32,679,000
Recurring [Member] \| Mortgage-backed and CMOs [Member]
Securities available for sale:
Securities available for sale	96,882,000	103,904,000
Financial Assets:
Securities available for sale	96,882,000	103,904,000
Recurring [Member] \| State and municipal [Member]
Securities available for sale:
Securities available for sale	192,022,000	194,405,000
Financial Assets:
Securities available for sale	192,022,000	194,405,000
Recurring [Member] \| Corporate [Member]
Securities available for sale:
Securities available for sale	8,442,000	2,378,000
Financial Assets:
Securities available for sale	8,442,000	2,378,000
Nonrecurring [Member]
Assets:
Loans held for sale	9,215,000	6,330,000
Impaired loans, net of valuation allowance	440,000	1,142,000
Other real estate owned	4,731,000	5,353,000
Financial Assets:
Loans held for sale	9,215,000	6,330,000
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] \| Fair Value [Member]
Securities available for sale:
Securities available for sale	0	0
Assets:
Loans held for sale	0	0
Financial Assets:
Cash and cash equivalents	28,909,000	28,893,000
Securities available for sale	0	0
Loans held for sale	0	0
Loans, net of allowance	0	0
Bank owned life insurance	0	0
Accrued interest receivable	0	0
Financial Liabilities:
Deposits	0	0
Repurchase agreements	0	0
Other borrowings	0	0
Trust preferred capital notes	0	0
Accrued interest payable	0	0
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] \| Recurring [Member]
Securities available for sale:
Securities available for sale	0	0
Financial Assets:
Securities available for sale	0	0
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] \| Recurring [Member] \| Federal agencies and GSEs [Member]
Securities available for sale:
Securities available for sale	0	0
Financial Assets:
Securities available for sale	0	0
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] \| Recurring [Member] \| Mortgage-backed and CMOs [Member]
Securities available for sale:
Securities available for sale	0	0
Financial Assets:
Securities available for sale	0	0
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] \| Recurring [Member] \| State and municipal [Member]
Securities available for sale:
Securities available for sale	0	0
Financial Assets:
Securities available for sale	0	0
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] \| Recurring [Member] \| Corporate [Member]
Securities available for sale:
Securities available for sale	0	0
Financial Assets:
Securities available for sale	0	0
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] \| Nonrecurring [Member]
Assets:
Loans held for sale	0	0
Impaired loans, net of valuation allowance	0	0
Other real estate owned	0	0
Financial Assets:
Loans held for sale	0	0
Significant Other Observable Inputs, Level 2 [Member] \| Fair Value [Member]
Securities available for sale:
Securities available for sale	334,186,000	333,042,000
Assets:
Loans held for sale	9,215,000	6,330,000
Financial Assets:
Cash and cash equivalents	0	0
Securities available for sale	334,186,000	333,042,000
Loans held for sale	9,215,000	6,330,000
Loans, net of allowance	787,894,000	811,573,000
Bank owned life insurance	13,273,000	13,058,000
Accrued interest receivable	5,106,000	5,091,000
Financial Liabilities:
Deposits	1,020,830,000	1,066,448,000
Repurchase agreements	46,113,000	45,575,000
Other borrowings	11,078,000	13,064,000
Trust preferred capital notes	23,032,000	27,184,000
Accrued interest payable	758,000	857,000
Significant Other Observable Inputs, Level 2 [Member] \| Recurring [Member]
Securities available for sale:
Securities available for sale	334,186,000	333,042,000
Financial Assets:
Securities available for sale	334,186,000	333,042,000
Significant Other Observable Inputs, Level 2 [Member] \| Recurring [Member] \| Federal agencies and GSEs [Member]
Securities available for sale:
Securities available for sale	37,177,000	32,679,000
Financial Assets:
Securities available for sale	37,177,000	32,679,000
Significant Other Observable Inputs, Level 2 [Member] \| Recurring [Member] \| Mortgage-backed and CMOs [Member]
Securities available for sale:
Securities available for sale	96,882,000	103,904,000
Financial Assets:
Securities available for sale	96,882,000	103,904,000
Significant Other Observable Inputs, Level 2 [Member] \| Recurring [Member] \| State and municipal [Member]
Securities available for sale:
Securities available for sale	192,022,000	194,405,000
Financial Assets:
Securities available for sale	192,022,000	194,405,000
Significant Other Observable Inputs, Level 2 [Member] \| Recurring [Member] \| Corporate [Member]
Securities available for sale:
Securities available for sale	8,105,000	2,054,000
Financial Assets:
Securities available for sale	8,105,000	2,054,000
Significant Other Observable Inputs, Level 2 [Member] \| Nonrecurring [Member]
Assets:
Loans held for sale	9,215,000	6,330,000
Impaired loans, net of valuation allowance	440,000	1,142,000
Other real estate owned	4,731,000	5,353,000
Financial Assets:
Loans held for sale	9,215,000	6,330,000
Significant Unobservable Inputs, Level 3 [Member] \| Fair Value [Member]
Securities available for sale:
Securities available for sale	337,000	324,000
Assets:
Loans held for sale	0	0
Financial Assets:
Cash and cash equivalents	0	0
Securities available for sale	337,000	324,000
Loans held for sale	0	0
Loans, net of allowance	0	0
Bank owned life insurance	0	0
Accrued interest receivable	0	0
Financial Liabilities:
Deposits	0	0
Repurchase agreements	0	0
Other borrowings	0	0
Trust preferred capital notes	0	0
Accrued interest payable	0	0
Significant Unobservable Inputs, Level 3 [Member] \| Recurring [Member]
Securities available for sale:
Securities available for sale	337,000	324,000
Financial Assets:
Securities available for sale	337,000	324,000
Significant Unobservable Inputs, Level 3 [Member] \| Recurring [Member] \| Federal agencies and GSEs [Member]
Securities available for sale:
Securities available for sale	0	0
Financial Assets:
Securities available for sale	0	0
Significant Unobservable Inputs, Level 3 [Member] \| Recurring [Member] \| Mortgage-backed and CMOs [Member]
Securities available for sale:
Securities available for sale	0	0
Financial Assets:
Securities available for sale	0	0
Significant Unobservable Inputs, Level 3 [Member] \| Recurring [Member] \| State and municipal [Member]
Securities available for sale:
Securities available for sale	0	0
Financial Assets:
Securities available for sale	0	0
Significant Unobservable Inputs, Level 3 [Member] \| Recurring [Member] \| Corporate [Member]
Securities available for sale:
Securities available for sale	337,000	324,000
Financial Assets:
Securities available for sale	337,000	324,000
Significant Unobservable Inputs, Level 3 [Member] \| Nonrecurring [Member]
Assets:
Loans held for sale	0	0
Impaired loans, net of valuation allowance	0	0
Other real estate owned	0	0
Financial Assets:
Loans held for sale	$ 0	$ 0

Refers to the amount of impairment attributable to credit factors.

No definition available.

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Namespace Prefix:	amnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Refers to the approximate amount of impairment attributed to factors other than credit.

+ References

No definition available.

+ Details

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Namespace Prefix:	amnb_
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- Definition

The fair value of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy.

+ References

No definition available.

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Refers to the estimated amount of fair value of security.

+ References

No definition available.

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Namespace Prefix:	amnb_
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- Definition

This element represents the portion of the balance sheet assertion valued at fair value of interest receivable.

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No definition available.

+ Details

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Namespace Prefix:	amnb_
Data Type:	xbrli:monetaryItemType
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- Definition

Number of level 3 securities owned by the Company.

+ References

No definition available.

+ Details

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Namespace Prefix:	amnb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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Refers to the minimum number of years an appraisal of real estate property to consider as Level 3.

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No definition available.

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Namespace Prefix:	amnb_
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Period Type:	duration

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Refers to the par value on which fair value of security is estimated.

+ References

No definition available.

+ Details

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Namespace Prefix:	amnb_
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Refers to the percentage of fair value estimation of security.

+ References

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Period Type:	duration

- Definition

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph b

-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.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 8

-Footnote 2

-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.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 7, 8, 9, 10

-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

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

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-Name Accounting Standards Codification

-Glossary Cash Equivalents

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-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 7

-Footnote 1

-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.

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Amount of subordinated debt obligations (also known as subordinated loan, subordinated bond, subordinated debenture or junior debt) which has a priority ranking after other debts in a dissolution, measured at fair value.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph a

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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- Definition

Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3).

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Amount of gain (loss) recognized in other comprehensive income, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3).

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- Definition

Amount of purchases, sales, issues, and settlements (net) which have taken place in relation to assets measured at fair value on a recurring basis using unobservable inputs (level 3).

+ References

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This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

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- Definition

This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c

-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.

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- Definition

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Glossary Loan

-URI http://asc.fasb.org/extlink&oid=6517073

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 4

-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.

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- Definition

+ References

No definition available.

+ Details

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- Definition

+ References

No definition available.

+ Details

Name:	us-gaap_OtherLiabilitiesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. The amount of securities that an institution sells and agrees to repurchase (seller-borrower) at a specified date for a specified price, net of any reductions or offsets. Most repurchase agreements involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit (CDs), are sometimes used in repurchase agreements. A repurchase agreement is similar to the seller-borrower's borrowing funds equal to the sales price of the related securities with the securities as collateral. Maturities of such agreements are flexible and generally vary from one day to 270 days.

+ References

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

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 4

-IssueDate 2006-05-01

-Chapter 14

-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.

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