XML 115 R92.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Loans and Allowance for Credit Losses - Components of loans and associated allowance (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Loans and Allowance for Loan Losses |  |  |  |
Recorded Investment, Individually Evaluated |  | $ 3,767 |  |
Recorded Investment, Collectively Evaluated |  | 2,440,227 |  |
Loans | $ 2,759,583 | 2,443,994 |  |
Allowance for Loan Losses, Individually Evaluated |  | 954 |  |
Allowance for Loan Losses, Collectively Evaluated |  | 30,192 |  |
Loans and Leases Receivable, Allowance, Total | 35,843 | 31,146 | $ 31,572 | $ 34,246
Commercial |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |
Recorded Investment, Individually Evaluated |  | 3,047 |  |
Recorded Investment, Collectively Evaluated |  | 1,560,309 |  |
Loans | 1,849,267 | 1,563,356 |  |
Allowance for Loan Losses, Individually Evaluated |  | 954 |  |
Allowance for Loan Losses, Collectively Evaluated |  | 22,477 |  |
Loans and Leases Receivable, Allowance, Total | 27,902 | 23,431 | 22,806 | 25,811
Commercial | Commercial and industrial |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |
Recorded Investment, Individually Evaluated |  | 1,313 |  |
Recorded Investment, Collectively Evaluated |  | 582,563 |  |
Loans | 598,321 | 583,876 |  |
Allowance for Loan Losses, Individually Evaluated |  | 275 |  |
Allowance for Loan Losses, Collectively Evaluated |  | 8,958 |  |
Loans and Leases Receivable, Allowance, Total | 9,894 | 9,233 | 9,218 | 10,547
Commercial | Real estate construction |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |
Recorded Investment, Individually Evaluated |  | 262 |  |
Recorded Investment, Collectively Evaluated |  | 97,548 |  |
Loans | 124,034 | 97,810 |  |
Allowance for Loan Losses, Individually Evaluated |  | 97 |  |
Allowance for Loan Losses, Collectively Evaluated |  | 1,340 |  |
Loans and Leases Receivable, Allowance, Total | 6,111 | 1,437 | 810 | 690
Commercial | Commercial real estate |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |
Recorded Investment, Individually Evaluated |  | 1,472 |  |
Recorded Investment, Collectively Evaluated |  | 880,198 |  |
Loans | 1,126,912 | 881,670 |  |
Allowance for Loan Losses, Individually Evaluated |  | 582 |  |
Allowance for Loan Losses, Collectively Evaluated |  | 12,179 |  |
Loans and Leases Receivable, Allowance, Total | 11,897 | 12,761 | 12,778 | 14,574
Consumer |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |
Recorded Investment, Individually Evaluated |  | 720 |  |
Recorded Investment, Collectively Evaluated |  | 879,918 |  |
Loans | 910,316 | 880,638 |  |
Allowance for Loan Losses, Collectively Evaluated |  | 7,715 |  |
Loans and Leases Receivable, Allowance, Total | 7,941 | 7,715 | 8,766 | 8,435
Consumer | Residential | Real estate first mortgage |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |
Recorded Investment, Individually Evaluated |  | 535 |  |
Recorded Investment, Collectively Evaluated |  | 679,016 |  |
Loans | 726,879 | 679,551 |  |
Allowance for Loan Losses, Collectively Evaluated |  | 5,857 |  |
Loans and Leases Receivable, Allowance, Total | 6,578 | 5,857 | 6,874 | 6,174
Consumer | Residential | Real estate junior lien |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |
Recorded Investment, Individually Evaluated |  | 184 |  |
Recorded Investment, Collectively Evaluated |  | 150,295 |  |
Loans | 154,134 | 150,479 |  |
Allowance for Loan Losses, Collectively Evaluated |  | 1,318 |  |
Loans and Leases Receivable, Allowance, Total | 1,151 | 1,318 | 1,380 | 1,472
Consumer | Other revolving and installment |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |
Recorded Investment, Individually Evaluated |  | 1 |  |
Recorded Investment, Collectively Evaluated |  | 50,607 |  |
Loans | 29,303 | 50,608 |  |
Allowance for Loan Losses, Collectively Evaluated |  | 540 |  |
Loans and Leases Receivable, Allowance, Total | $ 212 | $ 540 | $ 512 | $ 789

X
- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References No definition available. + Details
Name: | alrs_FinancingReceivableAllowanceForLoanLossesCollectivelyEvaluated
Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References No definition available. + Details
Name: | alrs_FinancingReceivableAllowanceForLoanLossesIndividuallyEvaluated
Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The balance of financing receivables that were collectively evaluated for impairment. + References No definition available. + Details
Name: | alrs_FinancingReceivableRecordedInvestmentCollectivelyEvaluated
Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The balance of financing receivables that were individually evaluated for impairment. + References No definition available. + Details
Name: | alrs_FinancingReceivableRecordedInvestmentIndividuallyEvaluated
Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis=us-gaap_CommercialBorrowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=alrs_RealEstateConstructionPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis=us-gaap_ConsumerBorrowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=alrs_RealEstateFirstMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=alrs_RealEstateJuniorLienMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=alrs_OtherRevolvingAndInstallmentPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |