XML 17 R54.htm IDEA: XBRL DOCUMENT
v3.20.1

Loans and Allowance for Loan Losses - Loans by risk category (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Loans outstanding by loan portfolio segment and risk category |  |
Loans | $ 1,758,277 | $ 1,721,279
Pass |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 1,690,909 | 1,654,719
Special Mention |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 18,265 | 12,226
Substandard |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 49,086 | 54,334
Doubtful |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 17 |
Commercial |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 1,050,230 | 1,000,225
Commercial | Pass |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 988,242 | 935,719
Commercial | Special Mention |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 14,879 | 12,226
Commercial | Substandard |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 47,092 | 52,280
Commercial | Doubtful |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 17 |
Commercial | Commercial and industrial |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 502,637 | 479,144
Commercial | Commercial and industrial | Pass |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 470,867 | 448,306
Commercial | Commercial and industrial | Special Mention |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 10,178 | 9,585
Commercial | Commercial and industrial | Substandard |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 21,575 | 21,253
Commercial | Commercial and industrial | Doubtful |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 17 |
Commercial | Real estate construction |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 25,487 | 26,378
Commercial | Real estate construction | Pass |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 24,941 | 25,119
Commercial | Real estate construction | Special Mention |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 279 | 282
Commercial | Real estate construction | Substandard |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 267 | 977
Commercial | Commercial real estate |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 522,106 | 494,703
Commercial | Commercial real estate | Pass |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 492,434 | 462,294
Commercial | Commercial real estate | Special Mention |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 4,422 | 2,359
Commercial | Commercial real estate | Substandard |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 25,250 | 30,050
Consumer |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 708,047 | 721,054
Consumer | Pass |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 702,667 | 719,000
Consumer | Special Mention |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 3,386 |
Consumer | Substandard |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 1,994 | 2,054
Consumer | Residential | Real estate first mortgage |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 457,895 | 457,155
Consumer | Residential | Real estate first mortgage | Pass |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 455,720 | 456,358
Consumer | Residential | Real estate first mortgage | Special Mention |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 1,434 |
Consumer | Residential | Real estate first mortgage | Substandard |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 741 | 797
Consumer | Residential | Real estate junior lien |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 170,538 | 177,373
Consumer | Residential | Real estate junior lien | Pass |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 167,356 | 176,122
Consumer | Residential | Real estate junior lien | Special Mention |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 1,952 |
Consumer | Residential | Real estate junior lien | Substandard |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 1,230 | 1,251
Consumer | Other revolving and installment |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 79,614 | 86,526
Consumer | Other revolving and installment | Pass |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | 79,591 | 86,520
Consumer | Other revolving and installment | Substandard |  |
Loans outstanding by loan portfolio segment and risk category |  |
Loans | $ 23 | $ 6

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_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 + Details
Name: | us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember
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_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=alrs_RealEstateConstructionPortfolioSegmentMember
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_ClassOfFinancingReceivableTypeOfBorrowerAxis=us-gaap_ConsumerBorrowerMember
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_RealEstateFirstMortgageMember
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=alrs_OtherRevolvingAndInstallmentPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |