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Summary of significant accounting policies - Accounts Receivable and Additional Information (Details) | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Goodwill and other intangibles |  |  |
Goodwill | $ 82,190,000 | $ 82,190,000 |
Valuation, Income Approach | Measurement Input, Terminal Value |  |  |
Goodwill and other intangibles |  |  |
Goodwill impairment, measurement input | 0.75 |  |
Valuation, Publicly Traded Company Method |  |  |
Goodwill and other intangibles |  |  |
Goodwill impairment, measurement input | 0.20 |  |
Valuation, Sale Transaction Method |  |  |
Goodwill and other intangibles |  |  |
Goodwill impairment, measurement input | 0.05 |  |
American Savings Bank (ASB) |  |  |
Loans modified in a troubled debt restructuring |  |  |
Number of consecutive months of repayment required for loans to be removed from nonaccrual status | 6 months |  |
Goodwill and other intangibles |  |  |
Goodwill | $ 82,190,000 | 82,190,000 |
Goodwill impairment | 0 | 0 | $ 0
Low-income housing investments | 111,000,000 | 83,400,000 |
Commitments to fund affordable housing investments | $ 62,800,000 | 41,000,000 |
American Savings Bank (ASB) | Measurement Band A |  |  |
Goodwill and other intangibles |  |  |
Risks inherent in servicing assets and servicing liabilities band percent for risk categorization | 0.50% |  |
American Savings Bank (ASB) | Measurement Band B |  |  |
Goodwill and other intangibles |  |  |
Risks inherent in servicing assets and servicing liabilities band percent for risk categorization | 1.00% |  |
American Savings Bank (ASB) | Loans receivable |  |  |
Nonperforming loans |  |  |
Period for classification as delinquent | 90 days |  |
American Savings Bank (ASB) | Mortgage receivable |  |  |
Nonperforming loans |  |  |
Period for classification as delinquent | 180 days |  |
American Savings Bank (ASB) | Consumer |  |  |
Nonperforming loans |  |  |
Period for write-off | 120 days |  |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Accounts Receivable |  |  |
Allowance for customer accounts receivable, accrued unbilled revenues and other accounts receivable | $ 26,100,000 | $ 17,800,000 |
Electric utility revenues |  |  |
Weighted average AFUDC rate | 7.10% | 7.10% | 7.40%

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