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Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financial Instruments with Off Balance Sheet Risk |  |
Amount of credit risk | $ 819,520 | $ 678,644
Commitments to extend credit |  |
Financial Instruments with Off Balance Sheet Risk |  |
Amount of credit risk | 806,431 | 668,115
Standby letters of credit |  |
Financial Instruments with Off Balance Sheet Risk |  |
Amount of credit risk | $ 13,089 | $ 10,529

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- Definition Amount of expected for credit exposure on off-balance-sheet commitments. + References No definition available. + Details
Name: | alrs_OffBalanceSheetCreditRisk
Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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