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Fair value measurements - Fair Value Hierarchy of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Financial assets    
Available-for-sale investment securities $ 1,136,439 $ 1,429,667
Held-to-maturity investment securities 1,103,668  
Derivative asset, statement of financial position   Other
Financial liabilities    
Short-term borrowings—other than bank 0 $ 172,568
Other bank borrowings $ 750,000 695,120
Derivative liability, statement of financial position Other  
Carrying or notional amount    
Financial assets    
Available-for-sale investment securities $ 1,136,439 1,429,667
Held-to-maturity investment securities 1,201,314 1,251,747
Loans, net 6,121,606 5,907,514
Mortgage servicing rights 8,169 9,047
Derivative assets 16,880 16,220
Financial liabilities    
Deposit liabilities 1,063,907 611,718
Short-term borrowings—other than bank   172,568
Other bank borrowings 750,000 695,120
Long-term debt, net 2,842,429 2,384,980
Derivative liabilities 28,449 22,949
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings   87,967
Long-term debt, net 1,934,277 1,684,816
Estimated fair value    
Financial assets    
Available-for-sale investment securities 1,136,439 1,429,667
Held-to-maturity investment securities 1,103,668 1,150,971
Loans, net 5,738,999 5,454,202
Mortgage servicing rights 18,722 17,646
Derivative assets 1,058 1,348
Financial liabilities    
Deposit liabilities 1,053,101 597,617
Short-term borrowings—other than bank   172,568
Other bank borrowings 747,508 695,095
Long-term debt, net 2,133,225 2,122,605
Derivative liabilities 321 472
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings   87,967
Long-term debt, net 1,385,025 1,487,496
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 0 18
Financial liabilities    
Deposit liabilities 0 0
Short-term borrowings—other than bank   0
Other bank borrowings 0 0
Long-term debt, net 0 0
Derivative liabilities 18 0
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 1,122,081 1,414,765
Held-to-maturity investment securities 1,103,668 1,150,971
Loans, net 15,176 821
Mortgage servicing rights 0 0
Derivative assets 1,058 1,330
Financial liabilities    
Deposit liabilities 1,053,101 597,617
Short-term borrowings—other than bank   172,568
Other bank borrowings 747,508 695,095
Long-term debt, net 2,133,225 2,122,605
Derivative liabilities 303 472
Estimated fair value | Level 2 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings   87,967
Long-term debt, net 1,385,025 1,487,496
Estimated fair value | Level 3    
Financial assets    
Available-for-sale investment securities 14,358 14,902
Held-to-maturity investment securities 0 0
Loans, net 5,723,823 5,453,381
Mortgage servicing rights 18,722 17,646
Derivative assets 0 0
Financial liabilities    
Deposit liabilities 0 0
Short-term borrowings—other than bank   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