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Summary of significant accounting policies - Accounts Receivable and Additional Information (Details)
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Goodwill and other intangibles      
Goodwill $ 82,190,000 $ 82,190,000  
Valuation, Publicly Traded Company Method      
Goodwill and other intangibles      
Goodwill impairment, measurement input 0.25    
Measurement Input, Terminal Value | Valuation, Income Approach      
Goodwill and other intangibles      
Goodwill impairment, measurement input 0.75    
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 (in months) 6 months    
Goodwill and other intangibles      
Goodwill $ 82,190,000 82,190,000  
Goodwill impairment 0 0 $ 0
Low-income housing investments 112,200,000 107,000,000  
Commitments to fund affordable housing investments $ 87,900,000 70,100,000  
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 (in days) 90 days    
American Savings Bank (ASB) | Mortgage receivable      
Nonperforming loans      
Period for classification as delinquent (in days) 180 days    
American Savings Bank (ASB) | Consumer      
Nonperforming loans      
Period for write-off (in days) 120 days    
Hawaiian Electric Company, Inc. and Subsidiaries      
Accounts Receivable      
Allowance for customer accounts receivable, accrued unbilled revenues and other accounts receivable $ 4,600,000 $ 6,100,000  
Electric utility revenues      
Weighted average AFUDC rate 7.20% 7.10% 7.10%