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Risks and Uncertainties (Details)	3 Months Ended
	Mar. 31, 2024 bank subsidiaryBusinessTrust
Risks and Uncertainties [Abstract]
Number of banks | bank	2
Number of business subsidiary trusts | subsidiaryBusinessTrust	2

X

- Definition

Number of Banks

+ References

No definition available.

+ Details

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X

- Definition

Number Of Business Subsidiary Trusts

+ References

No definition available.

+ Details

Name:	arow_NumberOfBusinessSubsidiaryTrusts
Namespace Prefix:	arow_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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