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Guarantees (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Guarantees [Abstract]    
Commitments to Extend Credit, Nominal Amount $ 249,803us-gaap_LoansAndLeasesReceivableCommitmentsToPurchaseOrSell $ 237,940us-gaap_LoansAndLeasesReceivableCommitmentsToPurchaseOrSell
Standby Letters of Credit, Nominal Amount 3,317us-gaap_LettersOfCreditOutstandingAmount 3,345us-gaap_LettersOfCreditOutstandingAmount
Commitments to Extend Credit, Fair Value 0arow_FairValueDisclosureLoansAndLeasesReceivableCommitmentsToPurchaseOrSell 0arow_FairValueDisclosureLoansAndLeasesReceivableCommitmentsToPurchaseOrSell
Standby Letters of Credit, Fair Value $ 39arow_FairValueDisclosureLettersOfCreditOutstandingAmount $ 65arow_FairValueDisclosureLettersOfCreditOutstandingAmount