XML 71 R61.htm IDEA: XBRL DOCUMENT
v3.23.2

Loans and Allowance for Credit Losses - Amortized cost basis of loans (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
2023 | $ 241,666 |
2022 | 674,766 |
2021 | 487,679 |
2020 | 369,186 |
2019 | 204,094 |
Prior | 306,425 |
Loans amortized cost basis | 249,706 |
Loans | 2,533,522 | $ 2,443,994
Pass |  |
Financing Receivable, Past Due [Line Items] |  |
2023 | 241,666 |
2022 | 669,543 |
2021 | 486,378 |
2020 | 360,723 |
2019 | 199,812 |
Prior | 303,312 |
Loans amortized cost basis | 232,090 |
Loans | 2,493,524 | 2,408,709
Special Mention |  |
Financing Receivable, Past Due [Line Items] |  |
Loans |  | 22,032
Substandard |  |
Financing Receivable, Past Due [Line Items] |  |
2022 | 5,223 |
2021 | 1,301 |
2020 | 8,463 |
2019 | 4,282 |
Prior | 3,113 |
Loans amortized cost basis | 17,616 |
Loans | 39,998 | 13,253
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,634,109 | 1,563,356
Commercial | Pass |  |
Financing Receivable, Past Due [Line Items] |  |
Loans |  | 1,529,512
Commercial | Special Mention |  |
Financing Receivable, Past Due [Line Items] |  |
Loans |  | 21,969
Commercial | Substandard |  |
Financing Receivable, Past Due [Line Items] |  |
Loans |  | 11,875
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 899,413 | 880,638
Consumer | Pass |  |
Financing Receivable, Past Due [Line Items] |  |
Loans |  | 879,197
Consumer | Special Mention |  |
Financing Receivable, Past Due [Line Items] |  |
Loans |  | 63
Consumer | Substandard |  |
Financing Receivable, Past Due [Line Items] |  |
Loans |  | 1,378
Commercial and industrial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
2023 | 72,021 |
2022 | 129,710 |
2021 | 82,242 |
2020 | 81,337 |
2019 | 40,796 |
Prior | 25,671 |
Loans amortized cost basis | 120,083 |
Loans | 551,860 | 583,876
Commercial and industrial | Commercial | Pass |  |
Financing Receivable, Past Due [Line Items] |  |
2023 | 72,021 |
2022 | 124,487 |
2021 | 81,827 |
2020 | 72,874 |
2019 | 40,610 |
Prior | 24,848 |
Loans amortized cost basis | 102,467 |
Loans | 519,134 | 558,694
Commercial and industrial | Commercial | Special Mention |  |
Financing Receivable, Past Due [Line Items] |  |
Loans |  | 21,969
Commercial and industrial | Commercial | Substandard |  |
Financing Receivable, Past Due [Line Items] |  |
2022 | 5,223 |
2021 | 415 |
2020 | 8,463 |
2019 | 186 |
Prior | 823 |
Loans amortized cost basis | 17,616 |
Loans | 32,726 | 3,213
Real estate construction | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
2023 | 6,263 |
2022 | 37,948 |
2021 | 19,315 |
2020 | 4,440 |
2019 | 9,150 |
Prior | 1,006 |
Loans amortized cost basis | 306 |
Loans | 78,428 | 97,810
Real estate construction | Commercial | Pass |  |
Financing Receivable, Past Due [Line Items] |  |
2023 | 6,263 |
2022 | 37,948 |
2021 | 19,315 |
2020 | 4,440 |
2019 | 9,150 |
Prior | 1,006 |
Loans amortized cost basis | 306 |
Loans | 78,428 | 97,548
Real estate construction | Commercial | Substandard |  |
Financing Receivable, Past Due [Line Items] |  |
Loans |  | 262
Residential | Real estate first mortgage | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
2023 | 40,090 |
2022 | 202,056 |
2021 | 226,785 |
2020 | 111,801 |
2019 | 34,894 |
Prior | 91,788 |
Loans amortized cost basis | 216 |
Loans | 707,630 | 679,551
Residential | Real estate first mortgage | Consumer | Pass |  |
Financing Receivable, Past Due [Line Items] |  |
2023 | 40,090 |
2022 | 202,056 |
2021 | 226,785 |
2020 | 111,801 |
2019 | 34,894 |
Prior | 91,680 |
Loans amortized cost basis | 216 |
Loans | 707,522 | 678,743
Residential | Real estate first mortgage | Consumer | Special Mention |  |
Financing Receivable, Past Due [Line Items] |  |
Loans |  | 63
Residential | Real estate first mortgage | Consumer | Substandard |  |
Financing Receivable, Past Due [Line Items] |  |
Prior | 108 |
Loans | 108 | 745
Residential | Real estate junior lien | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
2023 | 13,552 |
2022 | 17,683 |
2021 | 6,751 |
2020 | 4,936 |
2019 | 1,947 |
Prior | 7,296 |
Loans amortized cost basis | 105,066 |
Loans | 157,231 | 150,479
Residential | Real estate junior lien | Consumer | Pass |  |
Financing Receivable, Past Due [Line Items] |  |
2023 | 13,552 |
2022 | 17,683 |
2021 | 6,751 |
2020 | 4,936 |
2019 | 1,947 |
Prior | 6,939 |
Loans amortized cost basis | 105,066 |
Loans | 156,874 | 149,847
Residential | Real estate junior lien | Consumer | Substandard |  |
Financing Receivable, Past Due [Line Items] |  |
Prior | 357 |
Loans | 357 | 632
Commercial real estate | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
2023 | 105,650 |
2022 | 278,338 |
2021 | 151,119 |
2020 | 160,601 |
2019 | 114,801 |
Prior | 178,627 |
Loans amortized cost basis | 14,685 |
Loans | 1,003,821 | 881,670
Commercial real estate | Commercial | Pass |  |
Financing Receivable, Past Due [Line Items] |  |
2023 | 105,650 |
2022 | 278,338 |
2021 | 150,233 |
2020 | 160,601 |
2019 | 110,705 |
Prior | 176,802 |
Loans amortized cost basis | 14,685 |
Loans | 997,014 | 873,270
Commercial real estate | Commercial | Substandard |  |
Financing Receivable, Past Due [Line Items] |  |
2021 | 886 |
2019 | 4,096 |
Prior | 1,825 |
Loans | 6,807 | 8,400
Other revolving and installment | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
2023 | 4,090 |
2022 | 9,031 |
2021 | 1,467 |
2020 | 6,071 |
2019 | 2,506 |
Prior | 2,037 |
Loans amortized cost basis | 9,350 |
Loans | 34,552 | 50,608
Other revolving and installment | Consumer | Pass |  |
Financing Receivable, Past Due [Line Items] |  |
2023 | 4,090 |
2022 | 9,031 |
2021 | 1,467 |
2020 | 6,071 |
2019 | 2,506 |
Prior | 2,037 |
Loans amortized cost basis | 9,350 |
Loans | $ 34,552 | 50,607
Other revolving and installment | Consumer | Substandard |  |
Financing Receivable, Past Due [Line Items] |  |
Loans |  | $ 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/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
- Definition Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: 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 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable that can be withdrawn, repaid, and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: 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 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolving
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: 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 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: 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 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated in current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: 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 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated two years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: 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 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: 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 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear
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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-14 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 80 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-80 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems
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_ClassOfFinancingReceivableTypeOfBorrowerAxis=us-gaap_ConsumerBorrowerMember
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_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=us-gaap_CommercialRealEstatePortfolioSegmentMember
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: |