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Fair value measurements - Fair Value Hierarchy of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Financial assets    
Available-for-sale investment securities $ 1,429,667 $ 2,574,618
Held-to-maturity investment securities 1,150,971  
Derivative asset, statement of financial position   Other
Financial liabilities    
Short-term borrowings—other than bank 172,568 $ 53,998
Other bank borrowings $ 695,120 88,305
Derivative liability, statement of financial position Other  
Carrying or notional amount    
Financial assets    
Available-for-sale investment securities $ 1,429,667 2,574,618
Held-to-maturity investment securities 1,251,747 522,270
Loans, net 5,907,514 5,150,388
Mortgage servicing rights 9,047 9,950
Derivative assets 16,220 57,377
Financial liabilities    
Deposit liabilities 611,718 423,976
Short-term borrowings—other than bank 172,568 53,998
Other bank borrowings 695,120 88,305
Long-term debt, net 2,384,980 2,321,937
Derivative liabilities 22,949 57,000
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings 87,967  
Long-term debt, net 1,684,816 1,676,402
Estimated fair value    
Financial assets    
Available-for-sale investment securities 1,429,667 2,574,618
Held-to-maturity investment securities 1,150,971 510,474
Loans, net 5,454,202 5,228,524
Mortgage servicing rights 17,646 14,480
Derivative assets 1,348 909
Financial liabilities    
Deposit liabilities 597,617 442,361
Short-term borrowings—other than bank 172,568 53,998
Other bank borrowings 695,095 88,304
Long-term debt, net 2,122,605 2,624,130
Derivative liabilities 472 5,282
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings 87,967  
Long-term debt, net 1,487,496 1,955,710
Estimated fair value | 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 18 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 | Level 1 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings 0  
Long-term debt, net 0 0
Estimated fair value | Level 2    
Financial assets    
Available-for-sale investment securities 1,414,765 2,559,191
Held-to-maturity investment securities 1,150,971 510,474
Loans, net 821 10,403
Mortgage servicing rights 0 0
Derivative assets 1,330 909
Financial liabilities    
Deposit liabilities 597,617 442,361
Short-term borrowings—other than bank 172,568 53,998
Other bank borrowings 695,095 88,304
Long-term debt, net 2,122,605 2,624,130
Derivative liabilities 472 5,271
Estimated fair value | Level 2 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings 87,967  
Long-term debt, net 1,487,496 1,955,710
Estimated fair value | Level 3    
Financial assets    
Available-for-sale investment securities 14,902 15,427
Held-to-maturity investment securities 0 0
Loans, net 5,453,381 5,218,121
Mortgage servicing rights 17,646 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 | Level 3 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings 0  
Long-term debt, net $ 0 $ 0