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Fair value measurements - Summary of financial assets and liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Financial assets    
Available-for-sale investment securities $ 2,232,336 $ 2,574,618
Held-to-maturity investment securities 411,191  
Financial liabilities    
Short-term borrowings—other than bank 171,125 53,998
Other bank borrowings 409,040 88,305
Carrying or notional amount    
Financial assets    
Available-for-sale investment securities 2,232,336 2,574,618
Held-to-maturity investment securities 510,879 522,270
Loans, net 5,620,085 5,150,388
Mortgage-servicing rights 9,351 9,950
Derivative assets 42,988 57,377
Financial liabilities    
Deposit liabilities 499,797 423,976
Short-term borrowings—other than bank 171,125 53,998
Other bank borrowings 409,040 88,305
Long-term debt, net 2,430,326 2,321,937
Derivative liabilities 4,897 57,000
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings 97,450  
Long-term debt, net 1,736,694 1,676,402
Estimated fair value    
Financial assets    
Available-for-sale investment securities 2,232,336 2,574,618
Held-to-maturity investment securities 411,191 510,474
Loans, net 5,149,625 5,228,524
Mortgage-servicing rights 17,244 14,480
Derivative assets 2,249 909
Financial liabilities    
Deposit liabilities 485,755 442,361
Short-term borrowings—other than bank 171,125 53,998
Other bank borrowings 409,033 88,304
Long-term debt, net 2,147,438 2,624,130
Derivative liabilities 88 5,282
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings 97,450  
Long-term debt, net 1,510,725 1,955,710
Estimated fair value | Quoted prices in active markets for identical assets (Level 1)    
Financial assets    
Available-for-sale investment securities 0 0
Held-to-maturity investment securities 0 0
Loans, net 0 0
Mortgage-servicing rights 0 0
Derivative assets 172 0
Financial liabilities    
Deposit liabilities 0 0
Short-term borrowings—other than bank 0 0
Other bank borrowings 0 0
Long-term debt, net 0 0
Derivative liabilities 0 11
Estimated fair value | Quoted prices in active markets for identical assets (Level 1) | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings 0  
Long-term debt, net 0 0
Estimated fair value | Significant  other observable  inputs (Level 2)    
Financial assets    
Available-for-sale investment securities 2,217,303 2,559,191
Held-to-maturity investment securities 411,191 510,474
Loans, net 3,071 10,403
Mortgage-servicing rights 0 0
Derivative assets 2,077 909
Financial liabilities    
Deposit liabilities 485,755 442,361
Short-term borrowings—other than bank 171,125 53,998
Other bank borrowings 409,033 88,304
Long-term debt, net 2,147,438 2,624,130
Derivative liabilities 88 5,271
Estimated fair value | Significant  other observable  inputs (Level 2) | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings 97,450  
Long-term debt, net 1,510,725 1,955,710
Estimated fair value | Significant unobservable inputs (Level 3)    
Financial assets    
Available-for-sale investment securities 15,033 15,427
Held-to-maturity investment securities 0 0
Loans, net 5,146,554 5,218,121
Mortgage-servicing rights 17,244 14,480
Derivative assets 0 0
Financial liabilities    
Deposit liabilities 0 0
Short-term borrowings—other than bank 0 0
Other bank borrowings 0 0
Long-term debt, net 0 0
Derivative liabilities 0 0
Estimated fair value | Significant unobservable inputs (Level 3) | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings 0  
Long-term debt, net $ 0 $ 0