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Fair value measurements - Fair Value Hierarchy of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Financial assets    
Available-for-sale investment securities $ 1,970,417 $ 1,232,826
Held-to-maturity investment securities 229,963 143,467
Financial liabilities    
Short-term borrowings—other than bank 129,379 185,710
Other bank borrowings 89,670 115,110
Carrying or notional amount    
Financial assets    
Available-for-sale investment securities 1,970,417 1,232,826
Held-to-maturity investment securities 226,947 139,451
Stock in Federal Home Loan Bank 8,680 8,434
Loans, net 5,260,917 5,080,107
Mortgage servicing rights 10,020 9,101
Derivative assets 120,980 25,179
Financial liabilities    
Deposit liabilities 548,830 769,825
Short-term borrowings—other than bank 129,379 185,710
Other bank borrowings 89,670 115,110
Long-term debt, net 2,119,129 1,964,365
Derivative liabilities 137,500 51,375
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings 49,979 88,987
Long-term debt, net 1,561,302 1,497,667
Estimated fair value    
Financial assets    
Available-for-sale investment securities 1,970,417 1,232,826
Held-to-maturity investment securities 229,963 143,467
Stock in Federal Home Loan Bank 8,680 8,434
Loans, net 5,439,330 5,157,537
Mortgage servicing rights 10,705 12,379
Derivative assets 4,536 300
Financial liabilities    
Deposit liabilities 552,800 765,976
Short-term borrowings—other than bank 129,379 185,710
Other bank borrowings 89,669 115,107
Long-term debt, net 2,487,790 2,156,927
Derivative liabilities 5,030 2,218
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings 49,979 88,987
Long-term debt, net 1,890,490 1,670,189
Estimated fair value | Level 1    
Financial assets    
Available-for-sale investment securities 0 0
Held-to-maturity investment securities 0 0
Stock in Federal Home Loan Bank 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
Derivative liabilities 500 33
Estimated fair value | Level 1 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings 0 0
Long-term debt, net 0 0
Estimated fair value | Level 2    
Financial assets    
Available-for-sale investment securities 1,943,232 1,204,229
Held-to-maturity investment securities 229,963 143,467
Stock in Federal Home Loan Bank 8,680 8,434
Loans, net 28,354 12,295
Mortgage servicing rights 0
Derivative assets 4,536 300
Financial liabilities    
Deposit liabilities 552,800 765,976
Short-term borrowings—other than bank 129,379 185,710
Other bank borrowings 89,669 115,107
Long-term debt, net 2,487,790 2,156,927
Derivative liabilities 4,530 2,185
Estimated fair value | Level 2 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings 49,979 88,987
Long-term debt, net 1,890,490 1,670,189
Estimated fair value | Level 3    
Financial assets    
Available-for-sale investment securities 27,185 28,597
Held-to-maturity investment securities 0 0
Stock in Federal Home Loan Bank 0 0
Loans, net 5,410,976 5,145,242
Mortgage servicing rights 10,705 12,379
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
Derivative liabilities 0 0
Estimated fair value | Level 3 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings 0 0
Long-term debt, net $ 0 $ 0