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Guarantees (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Guarantees [Abstract] |  |
Commitments to Extend Credit, Nominal Amount | $ 383,586 | $ 278,623
Standby Letters of Credit, Nominal Amount | 3,445 | 3,065
Commitments to Extend Credit, Fair Value | 0 | 0
Fair Value Disclosure, Letters of Credit Outstanding, Amount | $ 30 | $ 2

X
- Definition The fair value of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | arow_FairValueDisclosureLettersOfCreditOutstandingAmount
Namespace Prefix: | arow_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reflects the fair value of loans and leases for which agreements to acquire or dispose exist. + References No definition available. + Details
Name: | arow_FairValueDisclosureLoansAndLeasesReceivableCommitmentsToPurchaseOrSell
Namespace Prefix: | arow_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reflects the carrying amount of loans and leases for which agreements to acquire or dispose exist. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064133&loc=d3e61044-112788 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68064133&loc=d3e61082-112788 + Details
Name: | us-gaap_LoansAndLeasesReceivableCommitmentsToPurchaseOrSell
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration