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Bank segment (HEI only) - Investment Securities (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Available-for-sale          
Due in one year or less     $ 1,193    
Due after one year through five years     106,628    
Due after five years through ten years     39,802    
Due after ten years     0    
Total     147,623    
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies     1,530,582    
Amortized cost     1,678,205    
Held-to-maturity          
Due in one year or less     0    
Due after one year through five years     0    
Due after five years through ten years     59,894    
Due after ten years     0    
Total     59,894    
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies     1,191,853    
Amortized cost   $ 522,270 1,251,747 $ 522,270  
Available-for-sale          
Due in one year or less     1,171    
Due after one year through five years     98,871    
Due after five years through ten years     36,657    
Due after ten years     0    
Total     136,699    
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies     1,292,968    
Total available-for-sale securities   2,574,618 1,429,667 2,574,618  
Held-to-maturity          
Due in one year or less     0    
Due after one year through five years     0    
Due after five years through ten years     51,416    
Due after ten years     0    
Total     51,416    
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies     1,099,555    
Total held-to-maturity securities     1,150,971    
Gains (losses) from sales of available-for-sale investments          
Proceeds     0 197,354 $ 169,157
Gross gains     0 975 9,275
Gross losses     0 (447) 0
Tax expense on realized gains   142 0   2,486
Interest income from taxable and non-taxable investment securities          
Taxable     56,731 42,534 29,760
Non-taxable     1,313 930 769
Total     58,044 43,464 $ 30,529
Available-for-sale securities pledged at carrying value   416,000 929,000 416,000  
Available-for-sale securities, pledged at carrying value as collateral for securities sold under agreements to repurchase   161,000 327,000 161,000  
Stock in federal home loan bank at cost   10,000 26,560 10,000  
American Savings Bank (ASB)          
Available-for-sale          
Amortized cost   2,618,384 1,678,205 2,618,384  
Held-to-maturity          
Amortized cost   522,270 1,251,747 522,270  
Available-for-sale          
Total available-for-sale securities   2,574,618 1,429,667 2,574,618  
Held-to-maturity          
Total held-to-maturity securities   510,474 1,150,971 510,474  
Interest income from taxable and non-taxable investment securities          
Number of available-for-sale investment securities transferred | security 66        
Available-for-sale and held-to-maturity, fair value $ 755,000        
Gross realized losses on available-for-sale securities $ 206,000        
Stock in federal home loan bank at cost   10,000 26,560 10,000  
FHLB Des Moines          
Interest income from taxable and non-taxable investment securities          
Stock in federal home loan bank at cost   $ 10,000 $ 26,600 $ 10,000