XML 64 R54.htm IDEA: XBRL DOCUMENT v3.23.2

Investment Securities - Proceeds from the call of held-to-maturity investment securities (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Investment Securities
Proceeds	$ 211	$ 126	$ 726

X

- Definition

The cash inflow associated with the sale or calls of securities that had been designated as held-to-maturity.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration