XML 167 R145.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Note 29 - Fair Value of Assets and Liabilities - Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques (Details) $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Servicing Asset at Fair Value, Amount |  | $ 7,918 | $ 2,052
Fair Value, Inputs, Level 3 [Member] | Measurement Input, Comparability Adjustment [Member] | Valuation, Market Approach [Member] |  |  |
Impaired Loans, Fair Value Disclosure |  | $ 34,088 | $ 3,998
Impaired Loans, Measurement Input |  |  | 0.10
Foreclosed assets | [1] |  | $ 32
Fair Value, Inputs, Level 3 [Member] | Measurement Input, Comparability Adjustment [Member] | Valuation, Market Approach [Member] | Weighted Average [Member] |  |  |
Impaired Loans, Measurement Input |  | 0.289 | 0.10
Fair Value, Inputs, Level 3 [Member] | Measurement Input, Prepayment Rate [Member] |  |  |
Servicing Asset at Fair Value, Amount |  |  | $ 2,062
Fair Value, Inputs, Level 3 [Member] | Measurement Input, Prepayment Rate [Member] | Weighted Average [Member] |  |  |
Servicing Asset, Measurement Input |  |  | 104
Fair Value, Inputs, Level 3 [Member] | Measurement Input, Prepayment Rate [Member] | Minimum [Member] |  |  |
Servicing Asset, Measurement Input |  |  | 85
Fair Value, Inputs, Level 3 [Member] | Measurement Input, Prepayment Rate [Member] | Maximum [Member] |  |  |
Servicing Asset, Measurement Input |  |  | 151
Fair Value, Inputs, Level 3 [Member] | Measurement Input, Prepayment Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |
Servicing Asset at Fair Value, Amount |  | $ 7,918 |
Fair Value, Inputs, Level 3 [Member] | Measurement Input, Prepayment Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] | Weighted Average [Member] |  |  |
Servicing Asset, Measurement Input |  | 165 |
Fair Value, Inputs, Level 3 [Member] | Measurement Input, Prepayment Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] | Minimum [Member] |  |  |
Servicing Asset, Measurement Input |  | 103 |
Fair Value, Inputs, Level 3 [Member] | Measurement Input, Prepayment Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] | Maximum [Member] |  |  |
Servicing Asset, Measurement Input |  | 495 |
Fair Value, Inputs, Level 3 [Member] | Measurement Input, Discount Rate [Member] |  |  |
Servicing Asset, Measurement Input |  | 10.5 | 11.1
Fair Value, Inputs, Level 3 [Member] | Measurement Input, Discount Rate [Member] | Weighted Average [Member] |  |  |
Servicing Asset, Measurement Input |  | 10.5 | 11.1
[1] | There were no discounts taken on the collateral that comprises the balance of foreclosed assets as of December 31, 2024.

X
- Definition Represents the fair value of foreclosed assets. + References No definition available. + Details
Name: | alrs_ForeclosedAssetsFairValueDisclosure
Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the fair value of impaired loans. + References No definition available. + Details
Name: | alrs_ImpairedLoansFairValueDisclosure
Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Value of input used to measure impaired asset. + References No definition available. + Details
Name: | alrs_ImpairedLoansMeasurementInput
Namespace Prefix: | alrs_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481229/860-50-50-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481260/860-50-45-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481260/860-50-45-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481260/860-50-45-2 + Details
Name: | us-gaap_ServicingAssetAtFairValueAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Value of input used to measure servicing asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_ServicingAssetMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputComparabilityAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=us-gaap_MarketApproachValuationTechniqueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputPrepaymentRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=us-gaap_ValuationTechniqueDiscountedCashFlowMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |