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Summary of significant accounting policies (Details 3) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Basic                      
Distributed earnings (in dollars per share)                   $ 1.24 $ 1.24
Undistributed earnings (loss) (in dollars per share)                   0.41 0.39
Earnings Per Share, basic (in dollars per share) $ 0.39 $ 0.47 $ 0.33 $ 0.31 $ 0.32 $ 0.47 $ 0.41 $ 0.45 $ 1.50 1.65 1.63
Diluted                      
Distributed earnings (in dollars per share)                   1.24 1.24
Undistributed earnings (losses) (in dollars per share)                   0.39 0.38
Earnings Per Share, diluted (in dollars per share) $ 0.39 $ 0.47 $ 0.33 $ 0.31 $ 0.32 $ 0.46 $ 0.41 $ 0.45 $ 1.50 $ 1.63 $ 1.62
Summary of significant accounting policies                      
Amount reclassified form other assets to plant and equipment $ 6,716,977       $ 6,399,724       $ 6,716,977 $ 6,399,724  
Other assets 488,635       542,523       488,635 542,523  
Accounts Receivable                      
Allowance for customer accounts receivable, accrued unbilled revenues and other accounts receivable 1,700       2,000       1,700 2,000  
Goodwill and other intangibles                      
Goodwill 82,190       82,190       $ 82,190 $ 82,190  
Fair value excess over carrying value (percent)                     60.00%
Antidilutive effect of stock appreciation rights (SARs)                      
Antidilutive effects of SARs shares that were not included in the computation of diluted EPS (in shares)                 0 0  
Hawaiian Electric Company, Inc. and Subsidiaries                      
Electric utility revenues                      
Revenue taxes included in revenues and in taxes, other than income taxes expense                 $ 209,000 $ 267,000 $ 266,000
Weighted average AFUDC rate (as a percent)                 7.60% 7.70% 7.60%
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum                      
Contributions in aid of construction                      
Contributions amortized period                 30 years    
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum                      
Contributions in aid of construction                      
Contributions amortized period                 55 years    
Bank                      
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 82,200       82,200       $ 82,200 $ 82,200  
Stock appreciation rights (SARs) | Common stock                      
Antidilutive effect of stock appreciation rights (SARs)                      
Antidilutive effects of SARs shares that were not included in the computation of diluted EPS (in shares)                     102,000
Bank                      
Summary of significant accounting policies                      
Other assets 309,946       305,416       309,946 305,416  
Goodwill and other intangibles                      
Goodwill 82,190       82,190       82,190 82,190  
Antidilutive effect of stock appreciation rights (SARs)                      
Affordable housing investment, carrying value 37,793       33,438       37,793 33,438  
Commitments to fund affordable housing investments $ 10,100       $ 14,800       $ 10,100 $ 14,800  
Bank | Loans receivable                      
Nonperforming loans                      
Loans and Leases Receivable, Nonperforming, Period For Classification As Delinquent                 90 days    
Bank | Mortgage receivable                      
Nonperforming loans                      
Loans and Leases Receivable, Nonperforming, Period For Classification As Delinquent                 180 days    
Bank | Consumer loans                      
Nonperforming loans                      
Loans and Leases Receivable, Nonperforming, Period For Write Off                 120 days    
Bank | Minimum                      
Antidilutive effect of stock appreciation rights (SARs)                      
Servicing Assets and servicing liabilities, basis spread                 0.50%    
Bank | Maximum                      
Antidilutive effect of stock appreciation rights (SARs)                      
Servicing Assets and servicing liabilities, basis spread                 1.00%