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Bank segment (HEI only) - Mortgage Servicing Rights and Valuation Allowance Roll Forward (Details) - American Savings Bank (ASB) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mortgage Servicing Rights [Roll Forward]        
Beginning balance $ 9,373 $ 9,373    
Ending balance   8,639 $ 9,373  
Allowance for mortgage-servicing assets – bank        
Mortgage Servicing Rights [Roll Forward]        
Beginning balance 9,373 9,373 8,884 $ 11,749
Amount capitalized   1,239 2,740 3,123
Amortization   (1,973) (2,251) (2,682)
Sale of mortgage servicing rights   0 0 (3,302)
Other-than-temporary impairment   0 0 (4)
Ending balance   8,639 9,373 8,884
Valuation Allowance [Roll Forward]        
Valuation allowance, beginning balance $ 0 0 0 209
Provision (recovery)   0 0 (205)
Other-than-temporary impairment   0 0 (4)
Valuation allowance, ending balance   0 0 0
Net carrying amount   8,639 $ 9,373 $ 8,884
Estimated Aggregate Amortization Expenses of Mortgage Servicing Rights [Abstract]        
2018   1,300    
2019   1,100    
2020   1,000    
2021   900    
2022   $ 800    
Measurement Band A        
Estimated Aggregate Amortization Expenses of Mortgage Servicing Rights [Abstract]        
Risks inherent in servicing assets and servicing liabilities band percent for risk categorization   0.50%    
Measurement Band B        
Estimated Aggregate Amortization Expenses of Mortgage Servicing Rights [Abstract]        
Risks inherent in servicing assets and servicing liabilities band percent for risk categorization 1.00%