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Loan Servicing | 6 Months Ended
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Jun. 30, 2023
Loan Servicing |
Loan Servicing | NOTE 6 Loan Servicing Loans serviced for others are not included in the accompanying consolidated balance sheets. The unpaid principal balances of loans serviced for others totaled $367.8 million and $357.2 million as of June 30, 2023 and December 31, 2022, respectively. Servicing loans for others generally consists of collecting mortgage payments, maintaining escrow accounts, disbursing payments to investors and collection and foreclosure processing. Loan servicing income is recorded on an accrual basis and includes servicing fees from investors and certain charges collected from borrowers, such as late payment fees, and is net of fair value adjustments to capitalized mortgage servicing rights. The following table summarizes the Company’s activity related to servicing rights for the three and six months ended June 30, 2023 and 2022: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three months ended |  | Six months ended
​ | ​ | June 30, | ​ | June 30,
(dollars in thousands) |  | 2023 |  | 2022 |  | 2023 |  | 2022
Balance, beginning of period | ​ | $ | 2,421 | ​ | $ | 1,771 | ​ | $ | 2,643 | ​ | $ | 1,880
Additions | ​ | ​ | 20 | ​ | ​ | 13 | ​ |  | 23 | ​ |  | 17
Amortization | ​ | ​ | (134) | ​ | ​ | (96) | ​ |  | (318) | ​ |  | (256)
Fair value adjustments | ​ | ​ | 44 | ​ | ​ | 376 | ​ |  | 3 | ​ |  | 423
Balance, end of period | ​ | $ | 2,351 | ​ | $ | 2,064 | ​ | $ | 2,351 | ​ | $ | 2,064
​ The following is a summary of key data and assumptions used in the valuation of servicing rights as of June 30, 2023 and December 31, 2022. Increases or decreases in any one of these assumptions would result in lower or higher fair value measurements. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | December 31, |
(dollars in thousands) | ​ | 2023 | ​ | 2022 | ​
Fair value of servicing rights | ​ | $ | 2,351 | ​ | $ | 2,643 | ​
Weighted-average remaining term, years | ​ |  | 19.0 | ​ |  | 20.5 | ​
Prepayment speeds | ​ |  | 6.1 | % |  | 6.9 | %
Discount rate | ​ |  | 11.0 | % |  | 10.5 | %
​

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- Definition The entire disclosure of servicing assets. + References No definition available. + Details
Name: | alrs_ServicingAssetTextBlock
Namespace Prefix: | alrs_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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