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Fair value measurements - Summary of financial assets and liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Financial assets    
Available-for-sale investment securities $ 2,305,257  
Held-to-maturity investment securities 285,599 $ 229,963
Financial liabilities    
Short-term borrowings—other than bank 100,242 129,379
Other bank borrowings 102,685 89,670
Carrying or notional amount    
Financial assets    
Available-for-sale investment securities 2,305,257 1,970,417
Held-to-maturity investment securities 295,046 226,947
Loans, net 5,241,925 5,260,917
Mortgage-servicing rights 10,685 10,020
Derivative assets 103,077 120,980
Financial liabilities    
Deposit liabilities 514,303 548,830
Short-term borrowings—other than bank 100,242 129,379
Other bank borrowings 102,685 89,670
Long-term debt, net 2,229,738 2,119,129
Derivative liabilities 32,739 137,500
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,675,863 1,561,302
Short-term borrowings   49,979
Estimated fair value    
Financial assets    
Available-for-sale investment securities 2,305,257 1,970,417
Held-to-maturity investment securities 285,599 229,963
Loans, net 5,376,133 5,439,330
Mortgage-servicing rights 13,659 10,705
Derivative assets 1,085 4,536
Financial liabilities    
Deposit liabilities 516,524 552,800
Short-term borrowings—other than bank 100,242 129,379
Other bank borrowings 102,684 89,669
Long-term debt, net 2,492,539 2,487,790
Derivative liabilities 2,834 5,030
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,904,613 1,890,490
Short-term borrowings   49,979
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 340 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 0 500
Estimated fair value | Level 1 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 0 0
Short-term borrowings   0
Estimated fair value | Level 2    
Financial assets    
Available-for-sale investment securities 2,289,830 1,943,232
Held-to-maturity investment securities 285,599 229,963
Loans, net 23,637 28,354
Mortgage-servicing rights 0 0
Derivative assets 745 4,536
Financial liabilities    
Deposit liabilities 516,524 552,800
Short-term borrowings—other than bank 100,242 129,379
Other bank borrowings 102,684 89,669
Long-term debt, net 2,492,539 2,487,790
Derivative liabilities 2,834 4,530
Estimated fair value | Level 2 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,904,613 1,890,490
Short-term borrowings   49,979
Estimated fair value | Level 3    
Financial assets    
Available-for-sale investment securities 15,427 27,185
Held-to-maturity investment securities 0 0
Loans, net 5,352,496 5,410,976
Mortgage-servicing rights 13,659 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 | Level 3 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net $ 0 0
Short-term borrowings   $ 0