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Leases - Narrative (Details)	9 Months Ended
Leases - Narrative (Details)	Sep. 30, 2020 branch_office
Leases [Abstract]
Number of branch offices	4

X

- Definition

Number of Leased Branch Offices

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration