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Comprehensive Income Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Schedule of Comprehensive Income [Line Items] |  |  |  |
Other comprehensive income, before reclassifications, net of tax | $ 745 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax | [1] | $ 241 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax | [1]
Reclassification from Accumulated Other Comprehensive Income, net of tax | 165 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax | [1] | 57 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax | [1]
Other Comprehensive Income, before Tax | 1,494 us-gaap_OtherComprehensiveIncomeLossBeforeTax |  | 493 us-gaap_OtherComprehensiveIncomeLossBeforeTax |
Other Comprehensive Income, Tax | (584)us-gaap_OtherComprehensiveIncomeLossTax |  | (195)us-gaap_OtherComprehensiveIncomeLossTax |
Other Comprehensive Income | 910 us-gaap_OtherComprehensiveIncomeLossNetOfTax | [1] | 298 us-gaap_OtherComprehensiveIncomeLossNetOfTax | [1]
Unrealized Gains and Losses on Available for Sale Securities [Member] |  |  |  |
Schedule of Comprehensive Income [Line Items] |  |  |  |
Other Comprehensive Income Loss Before Reclassifications Before Tax | 1,225 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  | 399 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Other Comprehensive Income Loss Before Reclassifications Tax (Expense) Benefit | (480)arow_OtherComprehensiveIncomeLossBeforeReclassificationsTaxExpenseBenefit / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  | (158)arow_OtherComprehensiveIncomeLossBeforeReclassificationsTaxExpenseBenefit / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Other comprehensive income, before reclassifications, net of tax | 745 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  | 241 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax | 90 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  | 0 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit | (35)arow_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodTaxExpenseBenefit / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  | 0 arow_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodTaxExpenseBenefit / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Reclassification from Accumulated Other Comprehensive Income, net of tax | 55 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  | 0 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Other Comprehensive Income | 800 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | [1] | 241 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | [1]
Amortization of Net Retirement Plan Actuarial Loss [Member] |  |  |  |
Schedule of Comprehensive Income [Line Items] |  |  |  |
Other comprehensive income, before reclassifications, net of tax | 0 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember | [1] | 0 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember | [1]
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax | 192 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember |  | 116 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember |
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit | (75)arow_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodTaxExpenseBenefit / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember |  | (46)arow_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodTaxExpenseBenefit / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember |
Reclassification from Accumulated Other Comprehensive Income, net of tax | 117 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember |  | 70 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember |
Other Comprehensive Income | 117 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember | [1] | 70 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember | [1]
Accretion of Net Retirement Plan Prior Service Credit [Member] |  |  |  |
Schedule of Comprehensive Income [Line Items] |  |  |  |
Other comprehensive income, before reclassifications, net of tax | 0 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember | [1] | 0 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember | [1]
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax | (13)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember |  | (22)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember |
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit | 6 arow_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodTaxExpenseBenefit / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember |  | 9 arow_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodTaxExpenseBenefit / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember |
Reclassification from Accumulated Other Comprehensive Income, net of tax | (7)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember |  | (13)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember |
Other Comprehensive Income | $ (7)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember | [1] | $ (13)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember | [1]
[1] | All amounts are net of tax. Amounts in parentheses indicate debits.

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