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Fair Value Measurements (Details Textuals) | 3 Months Ended
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Mar. 31, 2022
Fair Value Measurements (Textuals) [Abstract] |
Fair Value Inputs Closing Ratio | 79.00%

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- Definition Represents the percentage of loans currently in a lock position which management estimates will ultimately close. + References No definition available. + Details
Name: | asb_FairValueInputsClosingRatio
Namespace Prefix: | asb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_FairValueInputsQuantitativeInformationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration