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Bank segment (HEI only) - Available For Sale Investment Securities (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
issue
Dec. 31, 2016
USD ($)
issue
Available-for-sale    
Total available-for-sale securities, amortized cost $ 1,421,622,000 $ 1,118,350,000
Gross unrealized gains 1,231,000 2,662,000
Gross unrealized losses (21,655,000) (15,830,000)
Available-for-sale investment securities $ 1,401,198,000 $ 1,105,182,000
Number of issues, less than 12 months | issue 82 106
Fair value, less than 12 months $ 736,772,000 $ 833,130,000
Gross unrealized losses, less than 12 months $ (7,664,000) $ (14,153,000)
Number of issues, more than 12 months | issue 85 14
Fair value, 12 months or longer $ 522,208,000 $ 50,970,000
Gross unrealized losses, 12 months or longer (13,991,000) (1,677,000)
Held-to-maturity Securities [Abstract]    
Held-to-maturity Securities 44,515,000 0
Gross unrealized gains 1,000  
Gross unrealized losses (104,000)  
Held-to-maturity investment securities $ 44,412,000  
Number of issues, less than 12 months | issue 2  
Fair value, less than 12 months $ 35,744,000  
Gross unrealized losses, less than 12 months $ (104,000)  
Number of issues, more than 12 months | issue 0  
Fair value, 12 months or longer $ 0  
Gross unrealized losses, 12 months or longer 0  
U.S. Treasury and federal agency obligations    
Available-for-sale    
Total available-for-sale securities, amortized cost 185,891,000 193,515,000
Gross unrealized gains 438,000 920,000
Gross unrealized losses (2,031,000) (2,154,000)
Available-for-sale investment securities $ 184,298,000 $ 192,281,000
Number of issues, less than 12 months | issue 15 18
Fair value, less than 12 months $ 83,137,000 $ 123,475,000
Gross unrealized losses, less than 12 months $ (825,000) $ (2,010,000)
Number of issues, more than 12 months | issue 8 1
Fair value, 12 months or longer $ 62,296,000 $ 3,485,000
Gross unrealized losses, 12 months or longer (1,206,000) (144,000)
Mortgage-related securities-FNMA, FHLMC and GNMA    
Available-for-sale    
Total available-for-sale securities, amortized cost 1,220,304,000 909,408,000
Gross unrealized gains 793,000 1,742,000
Gross unrealized losses (19,624,000) (13,676,000)
Available-for-sale investment securities $ 1,201,473,000 $ 897,474,000
Number of issues, less than 12 months | issue 67 88
Fair value, less than 12 months $ 653,635,000 $ 709,655,000
Gross unrealized losses, less than 12 months $ (6,839,000) $ (12,143,000)
Number of issues, more than 12 months | issue 77 13
Fair value, 12 months or longer $ 459,912,000 $ 47,485,000
Gross unrealized losses, 12 months or longer (12,785,000) (1,533,000)
Held-to-maturity Securities [Abstract]    
Held-to-maturity Securities 44,515,000  
Gross unrealized gains 1,000  
Gross unrealized losses (104,000)  
Held-to-maturity investment securities $ 44,412,000  
Number of issues, less than 12 months | issue 2  
Fair value, less than 12 months $ 35,744,000  
Gross unrealized losses, less than 12 months $ (104,000)  
Number of issues, more than 12 months | issue 0  
Fair value, 12 months or longer $ 0  
Gross unrealized losses, 12 months or longer 0  
Mortgage revenue bond    
Available-for-sale    
Total available-for-sale securities, amortized cost 15,427,000 15,427,000
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Available-for-sale investment securities $ 15,427,000 $ 15,427,000
Number of issues, less than 12 months | issue 0 0
Fair value, less than 12 months $ 0 $ 0
Gross unrealized losses, less than 12 months $ 0 $ 0
Number of issues, more than 12 months | issue 0 0
Fair value, 12 months or longer $ 0 $ 0
Gross unrealized losses, 12 months or longer 0 0
American Savings Bank (ASB)    
Available-for-sale securities    
Payments to acquire new campus project 32,700,000  
Available-for-sale    
Available-for-sale investment securities 1,401,198,000 1,105,182,000
Held-to-maturity Securities [Abstract]    
Held-to-maturity Securities 44,515,000 0
Held-to-maturity investment securities $ 44,412,000 $ 0