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Loans and Allowance for Loan Losses - Accretable yield, or income expected to be collected (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($)
Loans and Allowance for Loan Losses |
New loans purchased | $ 225
Accretion of income | (48)
Ending balance | $ 177

X
- Definition The amount of accretion of income of accretable yield, or income expected to be collected. + References No definition available. + Details
Name: | alrs_FinancingReceivableAccruedInterestAccretionOfIncome
Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of accretable yield, or income expected to be collected on new loans purchased. + References No definition available. + Details
Name: | alrs_FinancingReceivableAccruedInterestAdditions
Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after allowance for credit loss, of accrued interest on financing receivable. + References No definition available. + Details
Name: | alrs_FinancingReceivableAccruedInterestAfterAllowanceForCreditLosses
Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableGrossAllowanceAndNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration