XML 72 R62.htm IDEA: XBRL DOCUMENT
v3.23.1

Loans and Allowance for Loan Losses - Loans by risk category (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Loans outstanding by loan portfolio segment and risk category |  |
Loans | $ 2,486,625 | $ 2,443,994
Pass |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans |  | 2,408,709
Special Mention |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans |  | 22,032
Substandard |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans |  | 13,253
Commercial |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 1,596,678 | 1,563,356
Commercial | Pass |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans |  | 1,529,512
Commercial | Special Mention |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans |  | 21,969
Commercial | Substandard |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans |  | 11,875
Commercial | Commercial and industrial |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 553,578 | 583,876
Commercial | Commercial and industrial | Pass |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 528,429 | 558,694
Commercial | Commercial and industrial | Special Mention |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans |  | 21,969
Commercial | Commercial and industrial | Substandard |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 25,149 | 3,213
Commercial | Real estate construction |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 108,776 | 97,810
Commercial | Real estate construction | Pass |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 108,336 | 97,548
Commercial | Real estate construction | Substandard |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 440 | 262
Commercial | Commercial real estate |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 934,324 | 881,670
Commercial | Commercial real estate | Pass |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 926,296 | 873,270
Commercial | Commercial real estate | Substandard |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 8,028 | 8,400
Consumer |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 889,947 | 880,638
Consumer | Pass |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans |  | 879,197
Consumer | Special Mention |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans |  | 63
Consumer | Substandard |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans |  | 1,378
Consumer | Residential | Real estate first mortgage |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 698,002 | 679,551
Consumer | Residential | Real estate first mortgage | Pass |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 697,833 | 678,743
Consumer | Residential | Real estate first mortgage | Special Mention |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 61 | 63
Consumer | Residential | Real estate first mortgage | Substandard |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 108 | 745
Consumer | Residential | Real estate junior lien |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 152,281 | 150,479
Consumer | Residential | Real estate junior lien | Pass |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 151,871 | 149,847
Consumer | Residential | Real estate junior lien | Substandard |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 410 | 632
Consumer | Other revolving and installment |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 39,664 | 50,608
Consumer | Other revolving and installment | Pass |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 39,663 | 50,607
Consumer | Other revolving and installment | Substandard |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | $ 1 | $ 1

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/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
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_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
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: |