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Note 8 - Loan Servicing (Details Textual) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Servicing Asset, Other | $ 181.8 | $ 190.0

X
- Definition The amount of other loan servicing assets. + References No definition available. + Details
Name: | alrs_ServicingAssetOther
Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration