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Long-term Funding Composition (Details) (USD $)
 0 Months Ended
Nov. 13, 2014
Dec. 31, 2014
Dec. 30, 2014
Dec. 31, 2013
Dec. 30, 2013
Sep. 30, 2012
Sep. 14, 2011
Mar. 31, 2011
Long-term Funding                
Federal Home Loan Bank Long Term Advances   $ 3,000,260,000us-gaap_FederalHomeLoanBankAdvancesLongTerm $ 500,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm $ 2,500,297,000us-gaap_FederalHomeLoanBankAdvancesLongTerm $ 2,500,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm      
Senior notes, at par   680,000,000us-gaap_SeniorNotes   585,000,000us-gaap_SeniorNotes        
Subordinated debt, at par   250,000,000us-gaap_SubordinatedDebt   0us-gaap_SubordinatedDebt        
Other long-term funding and capitalized costs   (143,000)us-gaap_OtherLongTermDebt   1,970,000us-gaap_OtherLongTermDebt        
Total long-term funding   3,930,117,000us-gaap_LongTermDebt   3,087,267,000us-gaap_LongTermDebt        
Long Term Debt Disclosure [Line Items]                
Percentage of interest rate on senior notes 2.75%us-gaap_DebtInstrumentInterestRateStatedPercentage              
Long-term Funding (Textuals) [Abstract]                
Weighted average interest rate of Long-term advances   0.11%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankWeightedAverageInterestRate   0.10%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankWeightedAverageInterestRate        
Federal Home Loan Bank Long Term Advances   3,000,260,000us-gaap_FederalHomeLoanBankAdvancesLongTerm 500,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm 2,500,297,000us-gaap_FederalHomeLoanBankAdvancesLongTerm 2,500,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm      
Federal Home Loan Bank Advances   3,500,000,000us-gaap_FederalHomeLoanBankAdvances            
Fixed coupon interest rate of subordinated debt 4.25%us-gaap_SubordinatedBorrowingInterestRate              
Subordinated debentures issued 250,000,000asb_JuniorSubordinatedDebenturesIssued              
New senior debt issued 250,000,000asb_NewSeniorDebtIssued         155,000,000asb_NewSeniorDebtIssued 130,000,000asb_NewSeniorDebtIssued 300,000,000asb_NewSeniorDebtIssued
Loans pledged to the FHLB   $ 4,700,000,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivablePledgedForFederalHomeLoanBankDebt            
Senior Notes [Member]                
Long Term Debt Disclosure [Line Items]                
Percentage of interest rate on senior notes             5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_SubordinatedBorrowingAxis
= us-gaap_SeniorNotesMember