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Leases - Narrative (Details) | 3 Months Ended
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Mar. 31, 2024 office bank
Leases [Abstract] |
Number of branch offices | office | 2
Number of banks | bank | 2

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

X
- 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