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Fair Value of Assets and Liabilities - Deposits held for sale (Details) $ in Thousands | Jan. 15, 2019 item | Dec. 31, 2018 USD ($)
--- | --- | ---
Fair Value of Assets and Liabilities |  |
Number of branches whose deposits are to be sold | item | 2 |
Deposits held for sale | $ |  | $ 24,197

X
- Definition The carrying amount as of the balance sheet date of deposits held for sale. + References No definition available. + Details
Name: | alrs_DepositsHeldForSale
Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the number of branches whose deposits are agreed to be sold during the period. + References No definition available. + Details
Name: | alrs_NumberOfBranchesWhoseDepositsAreSold
Namespace Prefix: | alrs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration