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Note 1 - Accounting Policies (Details Textual)	Sep. 30, 2022
Number of Banking Offices	26

X

- Definition

Represents the number of banking offices.

+ References

No definition available.

+ Details

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