XML 68 R57.htm IDEA: XBRL DOCUMENT
v3.25.3

Note 4 - Loans and Allowance for Credit Losses - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | $ 59,278 |  | $ 38,332 |  | $ 59,929 |  | $ 35,843 |  | $ 35,843
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions | 1,136 | [1] | 1,126 | [1] | 4,657 | [2] | 6,195 | [1] |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs | (740) |  | (505) |  | (5,469) |  | (3,444) |  | (4,833)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery | 2,453 |  | 189 |  | 3,010 |  | 548 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 62,127 |  | 39,142 |  | 62,127 |  | 39,142 |  | 59,929
Consumer Borrower [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 9,572 |  | 7,352 |  | 9,799 |  | 7,872 |  | 7,872
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions | 2,561 | [1] | 784 | [1] | 2,901 | [2] | 183 | [1] |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs | (134) |  | (161) |  | (826) |  | (177) |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery | 28 |  | 2 |  | 153 |  | 99 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 12,027 |  | 7,977 |  | 12,027 |  | 7,977 |  | 9,799
Consumer Borrower [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 8,326 |  | 6,234 |  | 8,170 |  | 9,705 |  | 9,705
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions | 3,270 | [1] | 660 | [1] | 3,276 | [2] | (159) | [1] |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs | (606) |  | (246) |  | (854) |  | (3,140) |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery | 2,415 |  | 153 |  | 2,813 |  | 395 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 13,405 |  | 6,801 |  | 13,405 |  | 6,801 |  | 8,170
Consumer Borrower [Member] | Residential Portfolio Segment [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 9,209 |  | 7,024 |  | 9,359 |  | 7,671 |  | 7,671
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions | 2,549 | [1] | 594 | [1] | 3,013 | [2] | (124) | [1] |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs | (100) |  | 0 |  | (714) |  | (3) |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery | 26 |  | 0 |  | 26 |  | 74 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 11,684 |  | 7,618 |  | 11,684 |  | 7,618 |  | 9,359
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate, First Lien [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 7,059 |  | 5,366 |  | 6,921 |  | 6,087 |  | 6,087
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions | 2,235 | [1] | 74 | [1] | 2,427 | [2] | (647) | [1] |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs | 0 |  | 0 |  | (54) |  | 0 |  | 0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery | 0 |  | 0 |  | 0 |  | 0 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 9,294 |  | 5,440 |  | 9,294 |  | 5,440 |  | 6,921
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 416 |  | 458 |  | 357 |  | 485 |  | 485
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions | (144) | [1] | (355) | [1] | (85) | [2] | (382) | [1] |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs | 0 |  | 0 |  | 0 |  | 0 |  | 0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery | 0 |  | 0 |  | 0 |  | 0 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 272 |  | 103 |  | 272 |  | 103 |  | 357
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 1,358 |  | 886 |  | 1,339 |  | 835 |  | 835
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions | 395 | [1] | 68 | [1] | 674 | [2] | 119 | [1] |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs | (100) |  | 0 |  | (360) |  | 0 |  | (19)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery | 26 |  | 0 |  | 26 |  | 0 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 1,679 |  | 954 |  | 1,679 |  | 954 |  | 1,339
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate, Junior Lien [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 376 |  | 314 |  | 742 |  | 264 |  | 264
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions | 63 | [1] | 807 | [1] | (3) | [2] | 786 | [1] |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs | 0 |  | 0 |  | (300) |  | (3) |  | (638)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery | 0 |  | 0 |  | 0 |  | 74 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 439 |  | 1,121 |  | 439 |  | 1,121 |  | 742
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Consumer, Other [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 363 |  | 328 |  | 440 |  | 201 |  | 201
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions | 12 | [1] | 190 | [1] | (112) | [2] | 307 | [1] |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs | (34) |  | (161) |  | (112) |  | (174) |  | (186)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery | 2 |  | 2 |  | 127 |  | 25 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 343 |  | 359 |  | 343 |  | 359 |  | 440
Commercial Borrower [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 49,706 |  | 30,980 |  | 50,130 |  | 27,971 |  | 27,971
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions | (1,425) | [1] | 342 | [1] | 1,756 | [2] | 6,012 | [1] |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs | (606) |  | (344) |  | (4,643) |  | (3,267) |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery | 2,425 |  | 187 |  | 2,857 |  | 449 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 50,100 |  | 31,165 |  | 50,100 |  | 31,165 |  | 50,130
Commercial Borrower [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs |  |  |  |  | (854) |  |  |  | (3,727)
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 40,142 |  | 24,302 |  | 40,732 |  | 18,086 |  | 18,086
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions | (5,144) | [1] | (313) | [1] | (2,351) | [2] | 5,912 | [1] |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs | 0 |  | (98) |  | (3,405) |  | (127) |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery | 10 |  | 14 |  | 32 |  | 34 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 35,008 |  | 23,905 |  | 35,008 |  | 23,905 |  | 40,732
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction, Land, and Development [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 18,529 |  | 10,820 |  | 16,277 |  | 6,135 |  | 6,135
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions | (1,272) | [1] | (447) | [1] | 980 | [2] | 4,238 | [1] |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs | 0 |  | 0 |  | 0 |  | 0 |  | 0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery | 0 |  | 0 |  | 0 |  | 0 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 17,257 |  | 10,373 |  | 17,257 |  | 10,373 |  | 16,277
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 4,876 |  | 2,430 |  | 4,716 |  | 1,776 |  | 1,776
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions | (539) | [1] | 161 | [1] | (379) | [2] | 815 | [1] |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs | 0 |  | 0 |  | 0 |  | 0 |  | 0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery | 0 |  | 0 |  | 0 |  | 0 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 4,337 |  | 2,591 |  | 4,337 |  | 2,591 |  | 4,716
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-Owner Occupied [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 12,919 |  | 8,772 |  | 16,513 |  | 7,726 |  | 7,726
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions | (2,796) | [1] | (260) | [1] | (2,989) | [2] | 786 | [1] |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs | 0 |  | 0 |  | (3,401) |  | 0 |  | 0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery | 0 |  | 0 |  | 0 |  | 0 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 10,123 |  | 8,512 |  | 10,123 |  | 8,512 |  | 16,513
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loans [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 3,818 |  | 2,280 |  | 3,226 |  | 2,449 |  | 2,449
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions | (537) | [1] | 233 | [1] | 37 | [2] | 73 | [1] |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs | 0 |  | (98) |  | (4) |  | (127) |  | (237)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery | 10 |  | 14 |  | 32 |  | 34 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 3,291 |  | 2,429 |  | 3,291 |  | 2,429 |  | 3,226
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 1,238 |  | 444 |  | 1,228 |  | 180 |  | 180
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions | 449 | [1] | (5) | [1] | 831 | [2] | 259 | [1] |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs | 0 |  | 0 |  | (384) |  | 0 |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery | 0 |  | 20 |  | 12 |  | 20 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 1,687 |  | 459 |  | 1,687 |  | 459 |  | 1,228
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Land [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 615 |  | 259 |  | 597 |  | 96 |  | 96
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions | 384 | [1] | (2) | [1] | 402 | [2] | 161 | [1] |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs | 0 |  | 0 |  | 0 |  | 0 |  | 0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery | 0 |  | 20 |  | 0 |  | 20 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 999 |  | 277 |  | 999 |  | 277 |  | 597
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Production Loans [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance | 623 |  | 185 |  | 631 |  | 84 |  | 84
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions | 65 | [1] | (3) | [1] | 429 | [2] | 98 | [1] |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs | 0 |  | 0 |  | (384) |  | 0 |  | (26)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery | 0 |  | 0 |  | 12 |  | 0 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | $ 688 |  | $ 182 |  | $ 688 |  | $ 182 |  | $ 631
[1] | The difference in the credit loss expense reported herein compared to the consolidated statements of income is associated with the credit loss expense of ($31) thousand related to off-balance sheet credit exposure and ($76) thousand related to HTM investment securities.
[2] | The difference in the credit loss expense reported herein compared to the consolidated statements of income is associated with the credit loss expense of ($3.9) million related to off-balance sheet credit exposure, ($6) thousand related to HTM investment securities, and $78 thousand related to non-mortgage loans transferred to held for sale.

X
- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-22 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis=us-gaap_ConsumerBorrowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=alrs_RealEstateFirstLienMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=alrs_RealEstateJuniorLienMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis=us-gaap_CommercialBorrowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=alrs_ConstructionLandAndDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=alrs_MultifamilyLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=alrs_NonownerOccupiedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=alrs_OwnerOccupiedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=alrs_AgriculturalRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=alrs_ProductionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |