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Commitments, Off-Balance Sheet Arrangements and Contingent Liabilities Summary of Lending Related and Other Commitments (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Summary of lending-related and other commitments    
Standby letters of credit Fair value $ 3,373us-gaap_LinesOfCreditFairValueDisclosure $ 3,542us-gaap_LinesOfCreditFairValueDisclosure
Commitments to Extend Credit, excluding commitments to originate residential mortgage loans held for sale [Member]    
Summary of lending-related and other commitments    
Lending related commitments 6,362,769asb_LendingRelatedCommitments
/ asb_LendingRelatedCommitmentsByTypeAxis
= us-gaap_CommitmentsToExtendCreditMember		 6,884,411asb_LendingRelatedCommitments
/ asb_LendingRelatedCommitmentsByTypeAxis
= us-gaap_CommitmentsToExtendCreditMember
Commercial Letters Of Credit [Member]    
Summary of lending-related and other commitments    
Lending related commitments 11,938asb_LendingRelatedCommitments
/ asb_LendingRelatedCommitmentsByTypeAxis
= asb_CommercialLettersOfCreditMember		 9,179asb_LendingRelatedCommitments
/ asb_LendingRelatedCommitmentsByTypeAxis
= asb_CommercialLettersOfCreditMember
Standby Letters of Credit [Member]    
Summary of lending-related and other commitments    
Lending related commitments 333,716asb_LendingRelatedCommitments
/ asb_LendingRelatedCommitmentsByTypeAxis
= us-gaap_StandbyLettersOfCreditMember		 353,292asb_LendingRelatedCommitments
/ asb_LendingRelatedCommitmentsByTypeAxis
= us-gaap_StandbyLettersOfCreditMember
Standby letters of credit Fair value $ 3,000us-gaap_LinesOfCreditFairValueDisclosure
/ asb_LendingRelatedCommitmentsByTypeAxis
= us-gaap_StandbyLettersOfCreditMember		 $ 4,000us-gaap_LinesOfCreditFairValueDisclosure
/ asb_LendingRelatedCommitmentsByTypeAxis
= us-gaap_StandbyLettersOfCreditMember