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Loan Servicing | 9 Months Ended
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Sep. 30, 2020
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 $476.3 million and $541.9 million as of September 30, 2020 and December 31, 2019, 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 nine months ended September 30, 2020 and 2019:
|  | Three months ended |  | Nine months ended
|  | September 30, |  | September 30,
(dollars in thousands) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Balance, beginning of period |  | $ | 2,891 |  | $ | 4,300 |  | $ | 3,845 |  | $ | 4,623
Additions |  |  | 42 |  |  | 179 |  |  | 154 |  |  | 279
Amortization |  |  | (296) |  |  | (287) |  |  | (692) |  |  | (690)
(Impairment)/Recovery |  |  | (58) |  |  | (46) |  |  | (728) |  |  | (66)
Balance, end of period |  | $ | 2,579 |  | $ | 4,146 |  | $ | 2,579 |  | $ | 4,146
The following is a summary of key data and assumptions used in the valuation of servicing rights as of September 30, 2020 and December 31, 2019. Increases or decreases in any one of these assumptions would result in lower or higher fair value measurements.
|  | September 30, |  | December 31, |
(dollars in thousands) |  | 2020 |  | 2019 |
Fair value of servicing rights |  | $ | 2,579 |  | $ | 3,845 |
Weighted-average remaining term, years |  |  | 20.0 |  |  | 20.1 |
Prepayment speeds |  |  | 23.8 | % |  | 11.8 | %
Discount rate |  |  | 9.0 | % |  | 9.4 | %

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- Definition The entire disclosure of servicing assets. + References No definition available. + Details
Name: | alrs_ServicingAssetTextBlock
Namespace Prefix: | alrs_
Data Type: | nonnum: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