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Derivative Instruments - Hedged assets and liabilities in fair value (Details) - Designated as hedging instruments - Fair value hedging $ in Thousands	Jun. 30, 2023 USD ($)
Derivative Instruments
Carrying Amount of Hedged Assets / Liabilities	$ 284,584
Cumulative Fair Value Hedging Adjustment in the Carrying Amount of Hedged Assets / Liabilities	(2,073)
Mortgage backed securities - Residential agency
Derivative Instruments
Carrying Amount of Hedged Assets / Liabilities	284,584
Cumulative Fair Value Hedging Adjustment in the Carrying Amount of Hedged Assets / Liabilities	$ (2,073)

X

- Definition

Amount of cumulative increase (decrease) in fair value of hedged asset (liabilities) in fair value hedge, attributable to hedged risk.

+ References

No definition available.

+ Details

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Namespace Prefix:	alrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- 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/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480237/815-40-50-5

+ Details

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A

+ Details

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Period Type:	instant

X

- Details

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- Details

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- Details

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