XML 67 R56.htm IDEA: XBRL DOCUMENT
v3.21.2

Loans and Allowance for Loan Losses - Components of loans and associated allowance (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Loans and Allowance for Loan Losses |  |  |  |  |  |
Recorded Investment, Individually Evaluated | $ 6,951 |  | $ 8,530 |  |  |
Recorded Investment, Collectively Evaluated | 1,793,435 |  | 1,970,845 |  |  |
Loans and Leases Receivable, Gross, Total | 1,800,386 |  | 1,979,375 |  |  |
Allowance for Loan Losses, Individually Evaluated | 559 |  | 1,205 |  |  |
Allowance for Loan Losses, Collectively Evaluated | 30,491 |  | 31,663 |  |  |
Loans and Leases Receivable, Allowance, Total | 32,066 | $ 33,764 | 34,246 | $ 31,337 | $ 27,256 | $ 23,924
Unallocated |  |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |  |
Loans and Leases Receivable, Allowance, Total | 1,016 | 2,469 | 1,378 | 2,395 | 1,747 | 2,192
Commercial |  |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |  |
Recorded Investment, Individually Evaluated | 6,654 |  | 7,840 |  |  |
Recorded Investment, Collectively Evaluated | 1,111,214 |  | 1,291,476 |  |  |
Loans and Leases Receivable, Gross, Total | 1,117,868 |  | 1,299,316 |  |  |
Allowance for Loan Losses, Individually Evaluated | 547 |  | 1,173 |  |  |
Allowance for Loan Losses, Collectively Evaluated | 21,756 |  | 23,795 |  |  |
Loans and Leases Receivable, Allowance, Total | 22,303 | 23,144 | 24,968 | 22,727 | 21,188 | 19,261
Commercial | Commercial and industrial |  |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |  |
Recorded Investment, Individually Evaluated | 2,161 |  | 2,616 |  |  |
Recorded Investment, Collectively Evaluated | 504,438 |  | 689,242 |  |  |
Loans and Leases Receivable, Gross, Total | 506,599 |  | 691,858 |  |  |
Allowance for Loan Losses, Individually Evaluated | 536 |  | 336 |  |  |
Allowance for Loan Losses, Collectively Evaluated | 8,564 |  | 9,869 |  |  |
Loans and Leases Receivable, Allowance, Total | 9,100 | 9,620 | 10,205 | 10,373 | 10,797 | 12,270
Commercial | Real estate construction |  |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |  |
Recorded Investment, Collectively Evaluated | 37,751 |  | 44,451 |  |  |
Loans and Leases Receivable, Gross, Total | 37,751 |  | 44,451 |  |  |
Allowance for Loan Losses, Collectively Evaluated | 679 |  | 658 |  |  |
Loans and Leases Receivable, Allowance, Total | 679 | 587 | 658 | 483 | 443 | 303
Commercial | Commercial real estate |  |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |  |
Recorded Investment, Individually Evaluated | 4,493 |  | 5,224 |  |  |
Recorded Investment, Collectively Evaluated | 569,025 |  | 557,783 |  |  |
Loans and Leases Receivable, Gross, Total | 573,518 |  | 563,007 |  |  |
Allowance for Loan Losses, Individually Evaluated | 11 |  | 837 |  |  |
Allowance for Loan Losses, Collectively Evaluated | 12,513 |  | 13,268 |  |  |
Loans and Leases Receivable, Allowance, Total | 12,524 | 12,937 | 14,105 | 11,871 | 9,948 | 6,688
Consumer |  |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |  |
Recorded Investment, Individually Evaluated | 297 |  | 690 |  |  |
Recorded Investment, Collectively Evaluated | 682,221 |  | 679,369 |  |  |
Loans and Leases Receivable, Gross, Total | 682,518 |  | 680,059 |  |  |
Allowance for Loan Losses, Individually Evaluated | 12 |  | 32 |  |  |
Allowance for Loan Losses, Collectively Evaluated | 8,735 |  | 7,868 |  |  |
Loans and Leases Receivable, Allowance, Total | 8,747 | 8,151 | 7,900 | 6,215 | 4,321 | 2,471
Consumer | Residential | Real estate first mortgage |  |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |  |
Recorded Investment, Individually Evaluated | 121 |  | 439 |  |  |
Recorded Investment, Collectively Evaluated | 501,218 |  | 462,931 |  |  |
Loans and Leases Receivable, Gross, Total | 501,339 |  | 463,370 |  |  |
Allowance for Loan Losses, Collectively Evaluated | 6,801 |  | 5,774 |  |  |
Loans and Leases Receivable, Allowance, Total | 6,801 | 6,176 | 5,774 | 4,367 | 2,673 | 1,448
Consumer | Residential | Real estate junior lien |  |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |  |
Recorded Investment, Individually Evaluated | 172 |  | 224 |  |  |
Recorded Investment, Collectively Evaluated | 130,071 |  | 143,192 |  |  |
Loans and Leases Receivable, Gross, Total | 130,243 |  | 143,416 |  |  |
Allowance for Loan Losses, Individually Evaluated | 8 |  | 19 |  |  |
Allowance for Loan Losses, Collectively Evaluated | 1,415 |  | 1,354 |  |  |
Loans and Leases Receivable, Allowance, Total | 1,423 | 1,401 | 1,373 | 1,211 | 1,102 | 671
Consumer | Other revolving and installment |  |  |  |  |  |
Loans and Allowance for Loan Losses |  |  |  |  |  |
Recorded Investment, Individually Evaluated | 4 |  | 27 |  |  |
Recorded Investment, Collectively Evaluated | 50,932 |  | 73,246 |  |  |
Loans and Leases Receivable, Gross, Total | 50,936 |  | 73,273 |  |  |
Allowance for Loan Losses, Individually Evaluated | 4 |  | 13 |  |  |
Allowance for Loan Losses, Collectively Evaluated | 519 |  | 740 |  |  |
Loans and Leases Receivable, Allowance, Total | $ 523 | $ 574 | $ 753 | $ 637 | $ 546 | $ 352

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 The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
Name: | us-gaap_LoansAndLeasesReceivableAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
Name: | us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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: |