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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 | Mar. 31, 2022 | Dec. 31, 2021
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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(a)(b) |  |
Summary of lending-related and other commitments |  |
Lending related commitments | 10,973,357 | 10,848,136
Commercial letters of credit(a) |  |
Summary of lending-related and other commitments |  |
Lending related commitments | 9,827 | 5,992
Standby letters of credit(c) |  |
Summary of lending-related and other commitments |  |
Lending related commitments | $ 257,039 | $ 248,292

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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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- 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: |

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