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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