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

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- Definition The amount of liability payable due to termination of contract. + References No definition available. + Details
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Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of true up liability. + References No definition available. + Details
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Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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