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Fair Value of Assets and Liabilities - Off-Balance Sheet Credit-Related Commitments (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Carrying amount |  |
Financial Assets |  |
Cash and cash equivalents | $ 61,174 | $ 40,651
Loans | 1,663,103 | 1,679,676
Accrued interest receivable | 7,412 | 7,645
Bank-owned life insurance | 31,364 | 30,763
Financial Liabilities |  |
Noninterest-bearing transaction | 537,951 | 550,640
Interest-bearing transaction | 1,102,409 | 1,053,869
Time deposits | 192,753 | 170,587
Deposits held for sale |  | 24,197
Short-term borrowings |  | 93,460
Long-term debt | 58,775 | 58,824
Accrued interest payable | 1,879 | 720
Estimated fair value |  |
Financial Assets |  |
Cash and cash equivalents | 61,174 | 40,651
Loans | 1,658,151 | 1,663,401
Accrued interest receivable | 7,412 | 7,645
Bank-owned life insurance | 31,364 | 30,763
Financial Liabilities |  |
Noninterest-bearing transaction | 537,951 | 550,640
Interest-bearing transaction | 1,102,409 | 1,053,869
Time deposits | 192,869 | 172,616
Deposits held for sale |  | 22,019
Short-term borrowings |  | 93,460
Long-term debt | 58,285 | 59,988
Accrued interest payable | 1,879 | 720
Level 1 | Estimated fair value |  |
Financial Assets |  |
Cash and cash equivalents | 61,174 | 40,651
Accrued interest receivable | 7,412 | 7,645
Financial Liabilities |  |
Short-term borrowings |  | 93,460
Accrued interest payable | 1,879 | 720
Level 2 | Estimated fair value |  |
Financial Assets |  |
Bank-owned life insurance | 31,364 | 30,763
Financial Liabilities |  |
Noninterest-bearing transaction | 537,951 | 550,640
Interest-bearing transaction | 1,102,409 | 1,053,869
Long-term debt | 58,285 | 59,988
Level 3 | Estimated fair value |  |
Financial Assets |  |
Loans | 1,658,151 | 1,663,401
Financial Liabilities |  |
Time deposits | $ 192,869 | 172,616
Deposits held for sale |  | $ 22,019

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- Definition Fair value portion of bank owned life insurance. + References No definition available. + Details
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Balance Type: | debit
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- Definition Fair value portion of deposits held for sale. + 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 bearing deposits. + 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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- Definition Fair value portion of interest receivable. + References No definition available. + Details
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- Definition Fair value portion of non interest bearing deposits. + References No definition available. + Details
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- Definition Fair value portion of time deposits. + References No definition available. + Details
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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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- 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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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity 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. This item represents the amount of short-term debt existing as of the balance sheet date. + References No definition available. + Details
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