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Loans, Allowance for Loan Losses, and Credit Quality Troubled Debt Restructurings Performing and Nonaccrual (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financing Receivable, Modifications [Line Items]      
Performing Restructured Loans $ 98,216asb_PerformingRestructuredLoans $ 123,985asb_PerformingRestructuredLoans $ 121,087asb_PerformingRestructuredLoans
Nonaccrual Restructured Loans 57,656asb_NonaccrualRestructuredLoans 59,585asb_NonaccrualRestructuredLoans 80,590asb_NonaccrualRestructuredLoans
Commercial and Industrial Portfolio Segment [Member]      
Financing Receivable, Modifications [Line Items]      
Performing Restructured Loans 33,892asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_CommercialPortfolioSegmentMember		 32,517asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_CommercialPortfolioSegmentMember		 28,140asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_CommercialPortfolioSegmentMember
Nonaccrual Restructured Loans 3,260asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_CommercialPortfolioSegmentMember		 6,900asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_CommercialPortfolioSegmentMember		 12,496asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Real Estate Owner Occupied Portfolio [Member]      
Financing Receivable, Modifications [Line Items]      
Performing Restructured Loans 10,454asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_CommercialRealEstateOwnerOccupiedPortfolioMember		 13,009asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_CommercialRealEstateOwnerOccupiedPortfolioMember		 13,852asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_CommercialRealEstateOwnerOccupiedPortfolioMember
Nonaccrual Restructured Loans 5,656asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_CommercialRealEstateOwnerOccupiedPortfolioMember		 10,999asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_CommercialRealEstateOwnerOccupiedPortfolioMember		 11,514asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_CommercialRealEstateOwnerOccupiedPortfolioMember
Commercial Real Estate Investor Portfolio Segment [Member]      
Financing Receivable, Modifications [Line Items]      
Performing Restructured Loans 23,127asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_CommercialRealEstateInvestorPortfolioSegmentMember		 44,946asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_CommercialRealEstateInvestorPortfolioSegmentMember		 41,660asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_CommercialRealEstateInvestorPortfolioSegmentMember
Nonaccrual Restructured Loans 15,216asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_CommercialRealEstateInvestorPortfolioSegmentMember		 18,069asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_CommercialRealEstateInvestorPortfolioSegmentMember		 25,221asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_CommercialRealEstateInvestorPortfolioSegmentMember
Commercial Real Estate Construction Financing Receivable [Member]      
Financing Receivable, Modifications [Line Items]      
Performing Restructured Loans 727asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 3,793asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 4,530asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Nonaccrual Restructured Loans 2,438asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 2,065asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 6,798asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Home Equity Portfolio Segments [Member]      
Financing Receivable, Modifications [Line Items]      
Performing Restructured Loans 10,066asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_HomeEquityPortfolioSegmentsMember		 9,633asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_HomeEquityPortfolioSegmentsMember		 9,968asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_HomeEquityPortfolioSegmentsMember
Nonaccrual Restructured Loans 7,518asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_HomeEquityPortfolioSegmentsMember		 5,419asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_HomeEquityPortfolioSegmentsMember		 6,698asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_HomeEquityPortfolioSegmentsMember
Installment and Credit Cards [Member]      
Financing Receivable, Modifications [Line Items]      
Performing Restructured Loans 974asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_InstallmentMember		 246asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_InstallmentMember		 653asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_InstallmentMember
Nonaccrual Restructured Loans 199asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_InstallmentMember		 451asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_InstallmentMember		 674asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= asb_InstallmentMember
Residential Portfolio Segment [Member]      
Financing Receivable, Modifications [Line Items]      
Performing Restructured Loans 18,976asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_ResidentialPortfolioSegmentMember		 19,841asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_ResidentialPortfolioSegmentMember		 22,284asb_PerformingRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_ResidentialPortfolioSegmentMember
Nonaccrual Restructured Loans $ 23,369asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_ResidentialPortfolioSegmentMember		 $ 15,682asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_ResidentialPortfolioSegmentMember		 $ 17,189asb_NonaccrualRestructuredLoans
/ asb_FinancingReceivableRestructuringsAxis
= us-gaap_ResidentialPortfolioSegmentMember