XML 64 R53.htm IDEA: XBRL DOCUMENT v3.21.2

Loans and Allowance for Loan Losses - Past due aging analysis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Past due aging analysis of loans
Accruing Current	$ 1,791,875	$ 1,969,285
Nonaccrual	6,229	5,050
Loans and Leases Receivable, Gross, Total	1,800,386	1,979,375
30 - 89 Days Past Due
Past due aging analysis of loans
Past due	2,282	5,010
90 Days or More Past Due
Past due aging analysis of loans
Past due		30
Commercial
Past due aging analysis of loans
Accruing Current	1,111,269	1,291,918
Nonaccrual	5,942	4,419
Loans and Leases Receivable, Gross, Total	1,117,868	1,299,316
Commercial | 30 - 89 Days Past Due
Past due aging analysis of loans
Past due	657	2,949
Commercial | 90 Days or More Past Due
Past due aging analysis of loans
Past due		30
Commercial | Commercial and industrial
Past due aging analysis of loans
Accruing Current	504,309	689,340
Nonaccrual	1,633	1,988
Loans and Leases Receivable, Gross, Total	506,599	691,858
Commercial | Commercial and industrial | 30 - 89 Days Past Due
Past due aging analysis of loans
Past due	657	500
Commercial | Commercial and industrial | 90 Days or More Past Due
Past due aging analysis of loans
Past due		30
Commercial | Real estate construction
Past due aging analysis of loans
Accruing Current	37,751	44,451
Loans and Leases Receivable, Gross, Total	37,751	44,451
Commercial | Commercial real estate
Past due aging analysis of loans
Accruing Current	569,209	558,127
Nonaccrual	4,309	2,431
Loans and Leases Receivable, Gross, Total	573,518	563,007
Commercial | Commercial real estate | 30 - 89 Days Past Due
Past due aging analysis of loans
Past due		2,449
Consumer
Past due aging analysis of loans
Accruing Current	680,606	677,367
Nonaccrual	287	631
Loans and Leases Receivable, Gross, Total	682,518	680,059
Consumer | 30 - 89 Days Past Due
Past due aging analysis of loans
Past due	1,625	2,061
Consumer | Residential | Real estate first mortgage
Past due aging analysis of loans
Accruing Current	500,350	461,179
Nonaccrual	113	439
Loans and Leases Receivable, Gross, Total	501,339	463,370
Consumer | Residential | Real estate first mortgage | 30 - 89 Days Past Due
Past due aging analysis of loans
Past due	876	1,752
Consumer | Residential | Real estate junior lien
Past due aging analysis of loans
Accruing Current	129,521	143,060
Nonaccrual	170	165
Loans and Leases Receivable, Gross, Total	130,243	143,416
Consumer | Residential | Real estate junior lien | 30 - 89 Days Past Due
Past due aging analysis of loans
Past due	552	191
Consumer | Other revolving and installment
Past due aging analysis of loans
Accruing Current	50,735	73,128
Nonaccrual	4	27
Loans and Leases Receivable, Gross, Total	50,936	73,273
Consumer | Other revolving and installment | 30 - 89 Days Past Due
Past due aging analysis of loans
Past due	$ 197	$ 118

X

- Definition

Amount of financing receivable not past due.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953401-111524

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 80
-URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922355-210448

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919253-210447

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of financing receivable on nonaccrual status.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of financing receivable past due.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 80
-URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922355-210448

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919253-210447

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953401-111524

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentPastDue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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_FinancingReceivableRecordedInvestmentPastDueLineItems
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=121593590&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_FinancingReceivablesPeriodPastDueAxis=alrs_FinancingReceivables30To89DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
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: