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Tax Credit Investments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Tax Credit Investments [Line items]
Investment	$ 7,906
Amortization expense on housing projects tax credit investments	0
Proportional amortization
Tax Credit Investments [Line items]
Investment	$ 7,906

X

- Definition

Amount of amortization expense attributable to housing projects tax credit investments.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of low income housing tax credit.

+ References

No definition available.

+ Details

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

X

- Definition

Tax Credit Investments [Line items]

+ References

No definition available.

+ Details

Name:	alrs_TaxCreditInvestmentsLineItems
Namespace Prefix:	alrs_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	alrs_AccountingMethodAxis=alrs_ProportionalAmortizationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: