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Bank segment (HEI only) Deposit Liabilities (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Weighted-average stated rate      
Savings (as a percent) 0.06%us-gaap_WeightedAverageRateDomesticDepositSavings 0.06%us-gaap_WeightedAverageRateDomesticDepositSavings  
Other checking, interest bearing (as a percent) 0.02%us-gaap_WeightedAverageRateDomesticDepositChecking 0.02%us-gaap_WeightedAverageRateDomesticDepositChecking  
Money market (as a percent) 0.12%us-gaap_WeightedAverageRateDomesticDepositMoneyMarket 0.13%us-gaap_WeightedAverageRateDomesticDepositMoneyMarket  
Term certificates (as a percent) 0.83%us-gaap_WeightedAverageRateDomesticDepositCertificatesOfDeposit 0.80%us-gaap_WeightedAverageRateDomesticDepositCertificatesOfDeposit  
Total weighted-average stated rate (as a percent) 0.11%us-gaap_WeightedAverageRateDomesticDeposit 0.11%us-gaap_WeightedAverageRateDomesticDeposit  
Deposit liabilities      
Savings $ 1,923,062,000us-gaap_InterestBearingDomesticDepositSavings $ 1,826,907,000us-gaap_InterestBearingDomesticDepositSavings  
Other checking      
Interest-bearing 768,787,000us-gaap_InterestBearingDomesticDepositChecking 721,700,000us-gaap_InterestBearingDomesticDepositChecking  
Noninterest-bearing 665,005,000us-gaap_NoninterestBearingDomesticDepositChecking 643,628,000us-gaap_NoninterestBearingDomesticDepositChecking  
Commercial checking 677,789,000he_NoninterestBearingDomesticDepositCommercialChecking 570,790,000he_NoninterestBearingDomesticDepositCommercialChecking  
Money market 158,010,000us-gaap_InterestBearingDomesticDepositMoneyMarket 182,546,000us-gaap_InterestBearingDomesticDepositMoneyMarket  
Term certificates 430,762,000us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits 426,906,000us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits  
Total Amount 4,623,415,000us-gaap_Deposits 4,372,477,000us-gaap_Deposits  
Certificate accounts of $100,000 or more 120,000,000us-gaap_TimeDeposits100000OrMoreDomestic 102,000,000us-gaap_TimeDeposits100000OrMoreDomestic  
Term certificates outstanding, scheduled maturities      
2015 255,896,000us-gaap_TimeDepositMaturitiesYearOne    
2016 55,614,000us-gaap_TimeDepositMaturitiesYearTwo    
2017 44,315,000us-gaap_TimeDepositMaturitiesYearThree    
2018 16,949,000us-gaap_TimeDepositMaturitiesYearFour    
2019 54,979,000us-gaap_TimeDepositMaturitiesYearFive    
Thereafter 3,009,000us-gaap_TimeDepositMaturitiesAfterYearFive    
Total 430,762,000us-gaap_TimeDeposits    
Interest expense on deposit liabilities by type of deposit      
Term certificates 3,603,000us-gaap_InterestExpenseTimeDeposits 3,702,000us-gaap_InterestExpenseTimeDeposits 4,865,000us-gaap_InterestExpenseTimeDeposits
Savings 1,134,000us-gaap_InterestExpenseSavingsDeposits 1,052,000us-gaap_InterestExpenseSavingsDeposits 1,128,000us-gaap_InterestExpenseSavingsDeposits
Money market 214,000us-gaap_InterestExpenseMoneyMarketDeposits 232,000us-gaap_InterestExpenseMoneyMarketDeposits 319,000us-gaap_InterestExpenseMoneyMarketDeposits
Interest-bearing checking 126,000he_InterestExpenseInterestBearingChecking 106,000he_InterestExpenseInterestBearingChecking 111,000he_InterestExpenseInterestBearingChecking
Interest expense on deposit liabilities $ 5,077,000us-gaap_InterestExpenseDeposits $ 5,092,000us-gaap_InterestExpenseDeposits $ 6,423,000us-gaap_InterestExpenseDeposits