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Loans and Allowance for Loan Losses - Collateral Dependent Loans (Details) $ in Thousands | Mar. 31, 2023 USD ($)
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Loans and Allowance for Loan Losses |
Amortized costs, collateral dependent loans | $ 120
Allowance for credit loss, collateral dependent loans | 70
Commercial |
Loans and Allowance for Loan Losses |
Amortized costs, collateral dependent loans | 120
Allowance for credit loss, collateral dependent loans | 60
Commercial | Commercial and industrial |
Loans and Allowance for Loan Losses |
Amortized costs, collateral dependent loans | 120
Allowance for credit loss, collateral dependent loans | 60
Consumer |
Loans and Allowance for Loan Losses |
Allowance for credit loss, collateral dependent loans | 10
Consumer | Real estate first mortgage |
Loans and Allowance for Loan Losses |
Allowance for credit loss, collateral dependent loans | 10
Real Estate |
Loans and Allowance for Loan Losses |
Amortized costs, collateral dependent loans | 424
Real Estate | Consumer |
Loans and Allowance for Loan Losses |
Amortized costs, collateral dependent loans | 424
Real Estate | Consumer | Real estate first mortgage |
Loans and Allowance for Loan Losses |
Amortized costs, collateral dependent loans | 424
Equipment |
Loans and Allowance for Loan Losses |
Amortized costs, collateral dependent loans | 120
Equipment | Commercial |
Loans and Allowance for Loan Losses |
Amortized costs, collateral dependent loans | 120
Equipment | Commercial | Commercial and industrial |
Loans and Allowance for Loan Losses |
Amortized costs, collateral dependent loans | $ 120

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- Definition The amount of allowance for credit loss on collateral dependent financing receivables. + References No definition available. + Details
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Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of amortized cost basis of collateral dependent financing receivables. + References No definition available. + Details
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Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
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Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Data Type: | na
Balance Type: |
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- Details
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Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_CollateralAxis=us-gaap_RealEstateMember
Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CollateralAxis=us-gaap_EquipmentMember
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Balance Type: |
Period Type: |