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True-Up Liability (Details) - FDIC - USD ($) $ in Millions	Oct. 24, 2018	Dec. 31, 2017
True-Up Liability
Value of True Up Liability		$ 3.2
Amount agreed to pay to FDIC	$ 3.0

X

- Definition

The amount of liability payable due to termination of contract.

+ References

No definition available.

+ Details

Name:	alrs_ContractTerminationLiability
Namespace Prefix:	alrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of true up liability.

+ References

No definition available.

+ Details

Name:	alrs_ValueOfTrueUpLiability
Namespace Prefix:	alrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

No definition available.

+ Details

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

X

- Details

Name:	srt_CounterpartyNameAxis=alrs_FederalDepositInsuranceCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: