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Bank segment (HEI only) - Securities Sold Under Agreements to Repurchase, Including Related Collateral Received From or Pledged to Counterparties (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Securities sold under agreements to repurchase      
Gross amount of recognized liabilities $ 0 $ 281,000  
Gross amount  offset in the  Balance Sheets 0 0  
Net amount of  liabilities presented in the Balance Sheets $ 0 281,000  
Fair value of collateral, percent of fair value 5.00%    
Repurchase liability $ 0 $ 281,120  
Weighted-average interest rate as of end of the period 0.00% 3.02%  
Identical securities      
Securities sold under agreements to repurchase      
Repurchase liability $ 0 $ 281,120 $ 88,305
Average amount outstanding during the year 62,441 127,170 88,405
Maximum amount outstanding as of any month-end $ 148,060 $ 284,040 $ 129,665
Weighted-average interest rate as of end of the period 0.00% 3.02% 0.02%
Weighted-average interest rate during the year 3.48% 0.99% 0.02%
Weighted-average remaining days to maturity as of end of the period 0 years 1 day 1 day
Commercial account holders      
Securities sold under agreements to repurchase      
Net amount of  liabilities presented in the Balance Sheets $ 0 $ 281,000  
Financial instruments 0 327,000  
Cash collateral pledged $ 0 $ 0