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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

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- Definition The amount of interchange fees incurred during the period. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The amount of miscellaneous transactional fees during the reporting period. + References No definition available. + Details
Name: | alrs_MiscellaneousTransactionalFees
Namespace Prefix: | alrs_
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Balance Type: | credit
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X
- Definition The amount of non interest income on mortgage banking. + References No definition available. + Details
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- Definition The amount of other non interest income during the reporting period. + References No definition available. + Details
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- Definition The amount of retirement and benefit services income during the period. + References No definition available. + Details
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Namespace Prefix: | alrs_
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Balance Type: | credit
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- Definition The amount of service charges on deposits accounts classified as non interest income. + References No definition available. + Details
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- Definition The amount of wealth management income during the period. + References No definition available. + Details
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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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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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- 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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