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Loans, Allowance for Credit Losses, and Credit Quality Troubled Debt Restructurings Performing and Nonaccrual (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Modifications [Line Items]    
Performing Restructured Loans $ 88,817asb_PerformingRestructuredLoans $ 98,216asb_PerformingRestructuredLoans
Nonaccrual Restructured Loans 53,553asb_NonaccrualRestructuredLoans 57,656asb_NonaccrualRestructuredLoans
Commercial and Industrial Portfolio Segment [Member]    
Financing Receivable, Modifications [Line Items]    
Performing Restructured Loans 26,466asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_CommercialPortfolioSegmentMember		 33,892asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_CommercialPortfolioSegmentMember
Nonaccrual Restructured Loans 6,631asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_CommercialPortfolioSegmentMember		 3,260asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Real Estate Owner Occupied Portfolio [Member]    
Financing Receivable, Modifications [Line Items]    
Performing Restructured Loans 9,780asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_CommercialRealEstateOwnerOccupiedPortfolioMember		 10,454asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_CommercialRealEstateOwnerOccupiedPortfolioMember
Nonaccrual Restructured Loans 5,705asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_CommercialRealEstateOwnerOccupiedPortfolioMember		 5,656asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_CommercialRealEstateOwnerOccupiedPortfolioMember
Commercial Real Estate Investor Portfolio Segment [Member]    
Financing Receivable, Modifications [Line Items]    
Performing Restructured Loans 22,775asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_CommercialRealEstateInvestorPortfolioSegmentMember		 23,127asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_CommercialRealEstateInvestorPortfolioSegmentMember
Nonaccrual Restructured Loans 8,697asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_CommercialRealEstateInvestorPortfolioSegmentMember		 15,216asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_CommercialRealEstateInvestorPortfolioSegmentMember
Commercial Real Estate Construction Financing Receivable [Member]    
Financing Receivable, Modifications [Line Items]    
Performing Restructured Loans 717asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 727asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Nonaccrual Restructured Loans 2,349asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 2,438asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Home Equity Port Folio Segments [Member]    
Financing Receivable, Modifications [Line Items]    
Performing Restructured Loans 9,739asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_HomeEquityPortFolioSegmentsMember		 10,066asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_HomeEquityPortFolioSegmentsMember
Nonaccrual Restructured Loans 6,555asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_HomeEquityPortFolioSegmentsMember		 7,518asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_HomeEquityPortFolioSegmentsMember
Installment and Credit Cards [Member]    
Financing Receivable, Modifications [Line Items]    
Performing Restructured Loans 891asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_InstallmentMember		 974asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_InstallmentMember
Nonaccrual Restructured Loans 167asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_InstallmentMember		 199asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_InstallmentMember
Residential Portfolio Segment [Member]    
Financing Receivable, Modifications [Line Items]    
Performing Restructured Loans 18,449asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_ResidentialPortfolioSegmentMember		 18,976asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_ResidentialPortfolioSegmentMember
Nonaccrual Restructured Loans $ 23,449asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_ResidentialPortfolioSegmentMember		 $ 23,369asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_ResidentialPortfolioSegmentMember