XML 102 R90.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Derivative Instruments - Gain (loss) recognized on derivatives instruments (Details) - Not designated as hedging - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Gain (loss) recognized on derivative instruments |  |  |  |
Total gain/(loss) from derivative instruments | $ (938) | $ (2,981) | $ 2,717 | $ (4,492)
Interest rate swaps | Other noninterest income |  |  |  |
Gain (loss) recognized on derivative instruments |  |  |  |
Total gain/(loss) from derivative instruments | 1 | 1 | 2 | 2
Interest rate lock commitments | Mortgage banking |  |  |  |
Gain (loss) recognized on derivative instruments |  |  |  |
Total gain/(loss) from derivative instruments | (1,724) | (1,793) | (1,871) | (7,298)
Forward loan sales commitments | Mortgage banking |  |  |  |
Gain (loss) recognized on derivative instruments |  |  |  |
Total gain/(loss) from derivative instruments | (532) | (499) | (480) | (2,061)
TBA mortgage backed securities | Mortgage banking |  |  |  |
Gain (loss) recognized on derivative instruments |  |  |  |
Total gain/(loss) from derivative instruments | $ 1,317 | $ (690) | $ 5,066 | $ 4,865

X
- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
Name: | us-gaap_DerivativeGainLossOnDerivativeNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsGainLossLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NotDesignatedAsHedgingInstrumentTradingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=alrs_OtherNonInterestIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateLockCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=alrs_MortgageBankingIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=alrs_ForwardLoanSalesCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=alrs_TbaMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |