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Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters, Summary of Lending Related and Other Commitments (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Schedule of lending-related and other commitments [Line Items] |  |
Lending related commitments, fair value | $ 0 | $ 0
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale |  |
Summary of lending-related and other commitments |  |
Lending related commitments | 8,552,601 | 8,027,187
Commercial Letters Of Credit |  |
Summary of lending-related and other commitments |  |
Lending related commitments | 13,167 | 11,886
Standby Letters of Credit |  |
Summary of lending-related and other commitments |  |
Lending related commitments | 255,858 | 235,361
Standby letters of credit, fair value | $ 3,000 | $ 2,000

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- Definition Lending related and other commitments. + References No definition available. + Details
Name: | asb_LendingRelatedAndOtherCommitmentsAbstract
Namespace Prefix: | asb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Lending related commitments. + References No definition available. + Details
Name: | asb_LendingRelatedCommitments
Namespace Prefix: | asb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lending Related Commitments, Fair Value + References No definition available. + Details
Name: | asb_LendingRelatedCommitmentsFairValue
Namespace Prefix: | asb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Schedule of lending-related and other commitments. + References No definition available. + Details
Name: | asb_ScheduleOfLendingRelatedAndOtherCommitmentsLineItems
Namespace Prefix: | asb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time. + References No definition available. + Details
Name: | us-gaap_LinesOfCreditFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | asb_LendingRelatedCommitmentsByTypeAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | asb_LendingRelatedCommitmentsByTypeAxis=asb_CommercialLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | asb_LendingRelatedCommitmentsByTypeAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |