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Derivative And Hedging Activities Derivative Instruments Not Designated as Hedging Instruments (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments Not Designated as Hedging Instruments [Abstract]    
Fair Value 33,023us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet 42,980us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet
Other Assets [Member] | Interest Rate Related Instruments Customer and Mirror [Member]    
Derivative Instruments Not Designated as Hedging Instruments [Abstract]    
Receive Rate (1) 1.60%asb_DerivativeAverageReceiveInterestRate
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_InterestRateRelatedInstrumentsCustomerAndMirrorMember		 1.63%asb_DerivativeAverageReceiveInterestRate
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_InterestRateRelatedInstrumentsCustomerAndMirrorMember
Pay Rate (1) 1.60%asb_DerivativeAveragePayInterestRate
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_InterestRateRelatedInstrumentsCustomerAndMirrorMember		 1.63%asb_DerivativeAveragePayInterestRate
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_InterestRateRelatedInstrumentsCustomerAndMirrorMember
Maturity 3 years 6 months 3 years 9 months
Other Assets [Member] | Interest Rate Lock Commitments [Member]    
Derivative Instruments Not Designated as Hedging Instruments [Abstract]    
Notional Amount 126,379invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateLockCommitmentsMember		 102,225invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateLockCommitmentsMember
Fair Value 1,947us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateLockCommitmentsMember		 416us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateLockCommitmentsMember
Other Assets [Member] | Purchased Deposit Option [Member]    
Derivative Instruments Not Designated as Hedging Instruments [Abstract]    
Notional Amount 110,347invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_PurchasedOptionMember		 115,953invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_PurchasedOptionMember
Fair Value 6,054us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_PurchasedOptionMember		 7,328us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_PurchasedOptionMember
Other Liabilities [Member] | Interest Rate Related Instruments Customer and Mirror [Member]    
Derivative Instruments Not Designated as Hedging Instruments [Abstract]    
Receive Rate (1) 1.60%asb_DerivativeAverageReceiveInterestRate
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_InterestRateRelatedInstrumentsCustomerAndMirrorMember		 1.63%asb_DerivativeAverageReceiveInterestRate
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_InterestRateRelatedInstrumentsCustomerAndMirrorMember
Pay Rate (1) 1.60%asb_DerivativeAveragePayInterestRate
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_InterestRateRelatedInstrumentsCustomerAndMirrorMember		 1.63%asb_DerivativeAveragePayInterestRate
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_InterestRateRelatedInstrumentsCustomerAndMirrorMember
Maturity 3 years 6 months 3 years 9 months
Other Liabilities [Member] | Forward Contracts [Member]    
Derivative Instruments Not Designated as Hedging Instruments [Abstract]    
Notional Amount 234,500invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember		 135,000invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
Fair Value (2,435)us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember		 1,301us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
Other Liabilities [Member] | Written Deposit Options [Member]    
Derivative Instruments Not Designated as Hedging Instruments [Abstract]    
Notional Amount 110,347invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_WrittenOptionsMember		 115,953invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_WrittenOptionsMember
Fair Value (6,054)us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_WrittenOptionsMember		 (7,328)us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_WrittenOptionsMember
Trading Assets [Member] | Interest Rate Related Instruments Customer and Mirror [Member]    
Derivative Instruments Not Designated as Hedging Instruments [Abstract]    
Notional Amount 1,636,480invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= asb_TradingassetsrMember
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_InterestRateRelatedInstrumentsCustomerAndMirrorMember		 1,821,787invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= asb_TradingassetsrMember
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_InterestRateRelatedInstrumentsCustomerAndMirrorMember
Fair Value 33,023us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= asb_TradingassetsrMember
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_InterestRateRelatedInstrumentsCustomerAndMirrorMember		 42,980us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= asb_TradingassetsrMember
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_InterestRateRelatedInstrumentsCustomerAndMirrorMember
Trading Assets [Member] | Foreign Currency Exchange Forward [Member]    
Derivative Instruments Not Designated as Hedging Instruments [Abstract]    
Notional Amount 60,742invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= asb_TradingassetsrMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember		 25,747invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= asb_TradingassetsrMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
Fair Value 2,140us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= asb_TradingassetsrMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember		 748us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= asb_TradingassetsrMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
Trading Liabilities [Member] | Interest Rate Related Instruments Customer and Mirror [Member]    
Derivative Instruments Not Designated as Hedging Instruments [Abstract]    
Notional Amount 1,636,480invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= asb_Tradingliabilities1Member
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_InterestRateRelatedInstrumentsCustomerAndMirrorMember		 1,821,787invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= asb_Tradingliabilities1Member
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_InterestRateRelatedInstrumentsCustomerAndMirrorMember
Fair Value (35,372)us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= asb_Tradingliabilities1Member
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_InterestRateRelatedInstrumentsCustomerAndMirrorMember		 (45,815)us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= asb_Tradingliabilities1Member
/ us-gaap_DerivativeInstrumentRiskAxis
= asb_InterestRateRelatedInstrumentsCustomerAndMirrorMember
Trading Liabilities [Member] | Foreign Currency Exchange Forward [Member]    
Derivative Instruments Not Designated as Hedging Instruments [Abstract]    
Notional Amount 56,573invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= asb_Tradingliabilities1Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember		 24,413invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= asb_Tradingliabilities1Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
Fair Value (1,957)us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= asb_Tradingliabilities1Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember		 (655)us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= asb_Tradingliabilities1Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember