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Note 22 - Fair Value of Assets and Liabilities - Schedule of Fair Value Assets Measured on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Foreclosed assets	$ 467
Collateral Pledged [Member]
Collateral dependent loans	26,492	$ 34,088
Fair Value, Inputs, Level 1 [Member]
Foreclosed assets	0
Fair Value, Inputs, Level 1 [Member] | Collateral Pledged [Member]
Collateral dependent loans	0	0
Fair Value, Inputs, Level 2 [Member]
Foreclosed assets	0
Fair Value, Inputs, Level 2 [Member] | Collateral Pledged [Member]
Collateral dependent loans	0	0
Fair Value, Inputs, Level 3 [Member]
Foreclosed assets	467
Fair Value, Inputs, Level 3 [Member] | Collateral Pledged [Member]
Collateral dependent loans	$ 26,492	$ 34,088

X

- Definition

Represents the fair value of foreclosed assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	alrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

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