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Note 29 - Fair Value of Assets and Liabilities (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($)
Fair Value, Inputs, Level 3 [Member] | Foreclosed Assets [Member] | Measurement Input, Comparability Adjustment [Member] | Valuation, Market Approach [Member] |
Securities Received as Collateral, Amount Foreclosed, Discounts | $ 0

X
- Definition The fair value of discounts on collateral received that was taken through foreclosure due to default by the original transferor in lieu of collection of the secured receivable. + References No definition available. + Details
Name: | alrs_SecuritiesReceivedAsCollateralAmountForeclosedDiscounts
Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=alrs_ForeclosedAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputComparabilityAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=us-gaap_MarketApproachValuationTechniqueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |