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v3.21.1

Fair Value of Assets and Liabilities - Off-Balance Sheet Credit-Related Commitments (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Carrying Amount |  |
Financial Assets |  |
Cash and cash equivalents | $ 190,217 | $ 172,962
Loans | 1,903,587 | 1,945,129
Accrued interest receivable | 9,271 | 9,662
Bank-owned life insurance | 32,556 | 32,363
Financial Liabilities |  |
Noninterest-bearing deposits | 775,434 | 754,716
Interest-bearing deposits | 1,729,231 | 1,607,939
Time deposits | 212,908 | 209,338
Long-term debt | 59,020 | 58,735
Accrued interest payable | 533 | 654
Estimated Fair Value |  |
Financial Assets |  |
Cash and cash equivalents | 190,217 | 172,962
Loans | 1,952,366 | 1,992,394
Accrued interest receivable | 9,271 | 9,662
Bank-owned life insurance | 32,556 | 32,363
Financial Liabilities |  |
Noninterest-bearing deposits | 775,434 | 754,716
Interest-bearing deposits | 1,729,231 | 1,607,939
Time deposits | 213,673 | 210,637
Long-term debt | 56,634 | 56,131
Accrued interest payable | 533 | 654
Level 1 | Estimated Fair Value |  |
Financial Assets |  |
Cash and cash equivalents | 190,217 | 172,962
Accrued interest receivable | 9,271 | 9,662
Financial Liabilities |  |
Accrued interest payable | 533 | 654
Level 2 | Estimated Fair Value |  |
Financial Assets |  |
Bank-owned life insurance | 32,556 | 32,363
Financial Liabilities |  |
Noninterest-bearing deposits | 775,434 | 754,716
Interest-bearing deposits | 1,729,231 | 1,607,939
Long-term debt | 56,634 | 56,131
Level 3 | Estimated Fair Value |  |
Financial Assets |  |
Loans | 1,952,366 | 1,992,394
Financial Liabilities |  |
Time deposits | $ 213,673 | $ 210,637

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- Definition Fair value portion of bank owned life insurance. + References No definition available. + Details
Name: | alrs_BankOwnedLifeInsuranceFairValueDisclosure
Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fair value portion of interest bearing deposits. + References No definition available. + Details
Name: | alrs_InterestBearingDepositsFairValueDisclosure
Namespace Prefix: | alrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair value portion of interest receivable. + 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 Fair value portion of interest receivable. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Fair value portion of non interest bearing deposits. + References No definition available. + Details
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Period Type: | instant

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- Definition Fair value portion of time deposits. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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Period Type: | instant

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- References No definition available. + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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