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Summary of significant accounting policies (Details 3)
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
Sep. 30, 2016
$ / shares
Jun. 30, 2016
$ / shares
Mar. 31, 2016
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Sep. 30, 2015
$ / shares
Jun. 30, 2015
$ / shares
Mar. 31, 2015
$ / shares
Dec. 31, 2016
USD ($)
acquisition
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
$ / shares
Basic                      
Distributed earnings (in dollars per share) | $ / shares                     $ 1.24
Undistributed earnings (loss) (in dollars per share) | $ / shares                     0.41
Earnings Per Share, basic (in dollars per share) | $ / shares $ 0.41 $ 1.17 $ 0.41 $ 0.30 $ 0.39 $ 0.47 $ 0.33 $ 0.31 $ 2.30 $ 1.50 1.65
Diluted                      
Distributed earnings (in dollars per share) | $ / shares                     1.24
Undistributed earnings (losses) (in dollars per share) | $ / shares                     0.39
Earnings Per Share, diluted (in dollars per share) | $ / shares $ 0.41 $ 1.17 $ 0.41 $ 0.30 $ 0.39 $ 0.47 $ 0.33 $ 0.31 $ 2.29 $ 1.50 $ 1.63
Accounts Receivable                      
Allowance for customer accounts receivable, accrued unbilled revenues and other accounts receivable $ 1,100,000       $ 1,700,000       $ 1,100,000 $ 1,700,000  
Goodwill and other intangibles                      
Goodwill 82,190,000       82,190,000       $ 82,190,000 82,190,000  
Weighted average discount rate                 2.517%    
American Savings Bank (ASB)                      
Goodwill and other intangibles                      
Goodwill 82,190,000       82,190,000       $ 82,190,000 82,190,000  
Market valuation, control premium (as a percent)                 18.40%    
Control premium calculation, number of acquisitions | acquisition                 18    
Control premium calculation, lower threshold acquisition purchase price                 $ 500,000,000    
Control premium calculation, lower threshold for interest purchased (as a percent)                 100.00%    
Weighted average discount rate                 8.90%    
Affordable housing investment, carrying value 47,081,000       37,793,000       $ 47,081,000 37,793,000  
Commitments to fund affordable housing investments 14,000,000       10,100,000       $ 14,000,000 10,100,000  
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 loans                      
Nonperforming loans                      
Period for write-off                 120 days    
Minimum | American Savings Bank (ASB)                      
Goodwill and other intangibles                      
Market valuation, assets held                 $ 3,500,000,000    
Servicing Assets and servicing liabilities, basis spread                 0.50%    
Maximum | American Savings Bank (ASB)                      
Goodwill and other intangibles                      
Market valuation, assets held                 $ 8,000,000,000    
Servicing Assets and servicing liabilities, basis spread                 1.00%    
Hawaiian Electric Company, Inc. and Subsidiaries                      
Electric utility revenues                      
Revenue taxes included in revenues and in taxes, other than income taxes expense                 $ 187,000,000 $ 209,000,000 $ 267,000,000
Weighted average AFUDC rate (as a percent)                 7.60% 7.60% 7.70%
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    
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 $ 82,200,000       $ 82,200,000       $ 82,200,000 $ 82,200,000