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Retirement Plans Fair Value of Pension Plan Investments Table (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Pension Plan Investments    
Money market account $ 2,868asb_DefinedBenefitPlanFairValueOfPlanAssetsMoneyMarketAccounts $ 7,127asb_DefinedBenefitPlanFairValueOfPlanAssetsMoneyMarketAccounts
Mutual funds 185,483asb_DefinedBenefitPlanFairValueOfPlanAssetsMutualFunds 187,958asb_DefinedBenefitPlanFairValueOfPlanAssetsMutualFunds
Common / collective trust funds 115,145asb_DefinedBenefitPlanFairValueOfPlanAssetsCommoncollectiveTrustFunds 86,915asb_DefinedBenefitPlanFairValueOfPlanAssetsCommoncollectiveTrustFunds
Total pension plan investments 303,496us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 282,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Fair Value, Inputs, Level 1 [Member]    
Pension Plan Investments    
Money market account 2,868asb_DefinedBenefitPlanFairValueOfPlanAssetsMoneyMarketAccounts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 7,127asb_DefinedBenefitPlanFairValueOfPlanAssetsMoneyMarketAccounts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Mutual funds 185,483asb_DefinedBenefitPlanFairValueOfPlanAssetsMutualFunds
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 187,958asb_DefinedBenefitPlanFairValueOfPlanAssetsMutualFunds
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Common / collective trust funds 0asb_DefinedBenefitPlanFairValueOfPlanAssetsCommoncollectiveTrustFunds
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 0asb_DefinedBenefitPlanFairValueOfPlanAssetsCommoncollectiveTrustFunds
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Total pension plan investments 188,351us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 195,085us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member]    
Pension Plan Investments    
Money market account 0asb_DefinedBenefitPlanFairValueOfPlanAssetsMoneyMarketAccounts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 0asb_DefinedBenefitPlanFairValueOfPlanAssetsMoneyMarketAccounts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Mutual funds 0asb_DefinedBenefitPlanFairValueOfPlanAssetsMutualFunds
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 0asb_DefinedBenefitPlanFairValueOfPlanAssetsMutualFunds
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Common / collective trust funds 115,145asb_DefinedBenefitPlanFairValueOfPlanAssetsCommoncollectiveTrustFunds
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 86,915asb_DefinedBenefitPlanFairValueOfPlanAssetsCommoncollectiveTrustFunds
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Total pension plan investments 115,145us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 86,915us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member]    
Pension Plan Investments    
Money market account 0asb_DefinedBenefitPlanFairValueOfPlanAssetsMoneyMarketAccounts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0asb_DefinedBenefitPlanFairValueOfPlanAssetsMoneyMarketAccounts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Mutual funds 0asb_DefinedBenefitPlanFairValueOfPlanAssetsMutualFunds
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0asb_DefinedBenefitPlanFairValueOfPlanAssetsMutualFunds
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Common / collective trust funds 0asb_DefinedBenefitPlanFairValueOfPlanAssetsCommoncollectiveTrustFunds
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0asb_DefinedBenefitPlanFairValueOfPlanAssetsCommoncollectiveTrustFunds
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Total pension plan investments $ 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 $ 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member