XML 97 R85.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Tax Credit Investments - Tax credits (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Tax Credit Investments [Line items] |  |
Investment | $ 17,906 | $ 7,906
Unfunded Commitment | 15,559 | 6,999
Proportional amortization |  |
Tax Credit Investments [Line items] |  |
Investment | 17,906 | 7,906
Unfunded Commitment | $ 15,559 | $ 6,999

X
- Definition Amount of low income housing tax credit. + References No definition available. + Details
Name: | alrs_LowIncomeHousingTaxCredit
Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of low income housing tax credit of unfunded commitment. + References No definition available. + Details
Name: | alrs_LowIncomeHousingTaxCreditUnfundedCommitment
Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Tax Credit Investments [Line items] + References No definition available. + Details
Name: | alrs_TaxCreditInvestmentsLineItems
Namespace Prefix: | alrs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | alrs_AccountingMethodAxis=alrs_ProportionalAmortizationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |