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v3.21.2

Leases - Narrative (Details) | 6 Months Ended
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Jun. 30, 2021 branch_office office
Leases [Abstract] |
Number of branch offices | branch_office | 4
Number of leased administrative offices | office | 1

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- Definition Number Of Leased Administrative Offices + References No definition available. + Details
Name: | arow_NumberOfLeasedAdministrativeOffices
Namespace Prefix: | arow_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Leased Branch Offices + References No definition available. + Details
Name: | arow_NumberofLeasedBranchOffices
Namespace Prefix: | arow_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration