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v3.26.1

Commitments and Contingencies - Additional Information (Details) - Standby Letters of Credit | Jun. 30, 2026
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Minimum |
Other Commitments [Line Items] |
Loan commitments, fixed fee (in percent) | 1.00%
Maximum |
Other Commitments [Line Items] |
Loan commitments, fixed fee (in percent) | 3.00%

X
- Definition Financing Receivable, Loan Commitments, Fixed Fees, Percent + References No definition available. + Details
Name: | arow_FinancingReceivableLoanCommitmentsFixedFeesPercent
Namespace Prefix: | arow_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |