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Noninterest Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Noninterest Income.
Retirement and benefits	$ 15,307	$ 15,536	$ 46,142	$ 46,873
Wealth management	3,896	3,685	11,385	10,948
Mortgage banking	8,135	5,318	19,739	13,551
Service charges on deposit accounts	447	442	1,321	1,333
Net gains (losses) on investment securities	48	13	357	119
Interchange fees	506	509	1,480	1,519
Bank-owned life insurance income	205	202	601	602
Misc. transactional fees	312	272	881	784
Other Noninterest Income	724	281	2,732	879
Total noninterest income	$ 29,580	$ 26,258	$ 84,638	$ 76,608

X

- Definition

The amount of interchange fees incurred during the period.

+ References

No definition available.

+ Details

Name:	alrs_InterchangeFees
Namespace Prefix:	alrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of miscellaneous transactional fees during the reporting period.

+ References

No definition available.

+ Details

Name:	alrs_MiscellaneousTransactionalFees
Namespace Prefix:	alrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of non interest income on mortgage banking.

+ References

No definition available.

+ Details

Name:	alrs_MortgageBankingIncome
Namespace Prefix:	alrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of other non interest income during the reporting period.

+ References

No definition available.

+ Details

Name:	alrs_OtherNoninterestIncome
Namespace Prefix:	alrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of retirement and benefit services income during the period.

+ References

No definition available.

+ Details

Name:	alrs_RetirementAndBenefitServicesIncome
Namespace Prefix:	alrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of service charges on deposits accounts classified as non interest income.

+ References

No definition available.

+ Details

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Namespace Prefix:	alrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of wealth management income during the period.

+ References

No definition available.

+ Details

Name:	alrs_WealthManagementIncome
Namespace Prefix:	alrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13)
-URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13)
-URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

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