XML 71 R60.htm IDEA: XBRL DOCUMENT
v3.21.2

Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 loan | Sep. 30, 2021 USD ($) loan
Troubled debt restructuring |  |  |
Number of loans modified as a troubled debt restructuring | 0 | 0 |
Number of loan modifications not considered TDRs, in connection with CARES Act | 587 |  | 587
Loan modifications not considered TDRS, in connection with CARES Act | $ | $ 154,500 |  | $ 154,500
Maximum |  |  |
Troubled debt restructuring |  |  |
Typical loan deferral period under the CARES Act |  |  | 90 days
Second Deferral |  |  |
Troubled debt restructuring |  |  |
Number of loan modifications not considered TDRs, in connection with CARES Act | 8 |  | 8
Loan modifications not considered TDRS, in connection with CARES Act | $ | $ 3,400 |  | $ 3,400
First Deferral |  |  |
Troubled debt restructuring |  |  |
Number of loan modifications not considered TDRs, in connection with CARES Act | 2 |  | 2
Loan modifications not considered TDRS, in connection with CARES Act | $ | $ 69 |  | $ 69

X
- Definition Financing receivable loan modifications value due to CARES Act, not considered troubled debt restructuring. + References No definition available. + Details
Name: | alrs_FinancingReceivableLoanModificationsValueDueToCaresAct
Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of financing receivable loan modifications due to CARES Act, not considered troubled debt restructuring. + References No definition available. + Details
Name: | alrs_FinancingReceivableNumberOfLoanModificationsDueToCaresAct
Namespace Prefix: | alrs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Typical loan deferral period under the CARES Act. + References No definition available. + Details
Name: | alrs_PeriodOfLoanPrincipalAndInterestDeferrals
Namespace Prefix: | alrs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=alrs_SecondPaymentDeferralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=alrs_FirstPaymentDeferralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |