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Income Taxes Major Reasons for the Difference in Effective Income Tax Rate from the Federal Tax Rate (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Effective Income Tax Rate Reconciliation      
Federal income tax rate at statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Increases (decreases) resulting from:      
Tax-exempt interest and dividends (4.60%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (4.50%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (4.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
State income taxes (net of federal income taxes) 2.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Bank owned life insurance (1.70%)asb_BankOwnedLifeInsurance1 (1.50%)asb_BankOwnedLifeInsurance1 (1.90%)asb_BankOwnedLifeInsurance1
Federal tax credits (1.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits (1.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Tax reserve adjustments 0.70%asb_TaxReserveAdjustments (1.90%)asb_TaxReserveAdjustments (1.80%)asb_TaxReserveAdjustments
Other 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.90%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate 31.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 29.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 29.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations