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Fair value measurements - Summary of financial assets and liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Financial assets    
Available-for-sale investment securities $ 2,509,906 $ 1,970,417
Held-to-maturity investment securities 374,141 229,963
Financial liabilities    
Short-term borrowings—other than bank 95,748 129,379
Other bank borrowings 129,665 89,670
Carrying or notional amount    
Financial assets    
Available-for-sale investment securities 2,509,906 1,970,417
Held-to-maturity investment securities 375,655 226,947
Loans, net 5,157,084 5,260,917
Mortgage-servicing rights 10,754 10,020
Derivative assets 30,465 120,980
Financial liabilities    
Deposit liabilities 484,357 548,830
Short-term borrowings—other than bank 95,748 129,379
Other bank borrowings 129,665 89,670
Long-term debt, net 2,258,043 2,119,129
Derivative liabilities 42,087 137,500
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,676,043 1,561,302
Short-term borrowings 37,999 49,979
Estimated fair value    
Financial assets    
Available-for-sale investment securities 2,509,906 1,970,417
Held-to-maturity investment securities 374,141 229,963
Loans, net 5,283,885 5,439,330
Mortgage-servicing rights 14,213 10,705
Derivative assets 511 4,536
Financial liabilities    
Deposit liabilities 485,862 552,800
Short-term borrowings—other than bank 95,748 129,379
Other bank borrowings 129,664 89,669
Long-term debt, net 2,623,110 2,487,790
Derivative liabilities 3,652 5,030
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 2,006,289 1,890,490
Short-term borrowings 37,999 49,979
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 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 26 500
Estimated fair value | Quoted prices in active markets for identical assets (Level 1) | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 0 0
Short-term borrowings 0 0
Estimated fair value | Significant  other observable  inputs (Level 2)    
Financial assets    
Available-for-sale investment securities 2,494,479 1,943,232
Held-to-maturity investment securities 374,141 229,963
Loans, net 50,884 28,354
Mortgage-servicing rights 0 0
Derivative assets 511 4,536
Financial liabilities    
Deposit liabilities 485,862 552,800
Short-term borrowings—other than bank 95,748 129,379
Other bank borrowings 129,664 89,669
Long-term debt, net 2,623,110 2,487,790
Derivative liabilities 3,626 4,530
Estimated fair value | Significant  other observable  inputs (Level 2) | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 2,006,289 1,890,490
Short-term borrowings 37,999 49,979
Estimated fair value | Significant unobservable inputs (Level 3)    
Financial assets    
Available-for-sale investment securities 15,427 27,185
Held-to-maturity investment securities 0 0
Loans, net 5,233,001 5,410,976
Mortgage-servicing rights 14,213 10,705
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    
Long-term debt, net 0 0
Short-term borrowings $ 0 $ 0