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Fair value measurements - Carrying or Notional Amount, Fair Value and Placement in the Fair Value Hierarchy of the Company’s Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Financial assets    
Available-for-sale investment securities $ 1,368,037 $ 1,429,667
Held-to-maturity investment securities 1,121,995  
Financial liabilities    
Short-term borrowings 46,212 172,568
Other bank borrowings 750,000 695,120
Carrying or notional amount    
Financial assets    
Available-for-sale investment securities 1,368,037 1,429,667
Held-to-maturity investment securities 1,224,917 1,251,747
Loans, net 6,076,024 5,907,514
Mortgage servicing rights 8,495 9,047
Derivative assets 31,944 16,220
Financial liabilities    
Deposit liabilities 815,538 611,718
Short-term borrowings 46,212 172,568
Other bank borrowings 750,000 695,120
Long-term debt, net 2,572,375 2,384,980
Derivative liabilities 22,949 22,949
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings   87,967
Long-term debt, net 1,834,515 1,684,816
Estimated fair value    
Financial assets    
Available-for-sale investment securities 1,368,037 1,429,667
Held-to-maturity investment securities 1,121,995 1,150,971
Loans, net 5,634,680 5,454,202
Mortgage servicing rights 18,127 17,646
Derivative assets 1,342 1,348
Financial liabilities    
Deposit liabilities 799,873 597,617
Short-term borrowings 46,212 172,568
Other bank borrowings 741,357 695,095
Long-term debt, net 2,351,288 2,122,605
Derivative liabilities 540 472
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings   87,967
Long-term debt, net 1,671,739 1,487,496
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 51 18
Financial liabilities    
Deposit liabilities 0 0
Short-term borrowings 0 0
Other bank borrowings 0 0
Long-term debt, net 0 0
Derivative liabilities 0 0
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 1,353,407 1,414,765
Held-to-maturity investment securities 1,121,995 1,150,971
Loans, net 6,906 821
Mortgage servicing rights 0 0
Derivative assets 1,291 1,330
Financial liabilities    
Deposit liabilities 799,873 597,617
Short-term borrowings 46,212 172,568
Other bank borrowings 741,357 695,095
Long-term debt, net 2,351,288 2,122,605
Derivative liabilities 540 472
Estimated fair value | Significant  other observable  inputs (Level 2) | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings   87,967
Long-term debt, net 1,671,739 1,487,496
Estimated fair value | Significant unobservable inputs (Level 3)    
Financial assets    
Available-for-sale investment securities 14,630 14,902
Held-to-maturity investment securities 0 0
Loans, net 5,627,774 5,453,381
Mortgage servicing rights 18,127 17,646
Derivative assets 0 0
Financial liabilities    
Deposit liabilities 0 0
Short-term borrowings 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