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Fair value measurements - Summary of financial assets and liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Financial assets    
Available-for-sale investment securities $ 1,747,658 $ 1,232,826
Held-to-maturity investment securities 138,622 143,467
Financial liabilities    
Short-term borrowings—other than bank 137,783 185,710
Other bank borrowings 151,875 115,110
Carrying or notional amount    
Financial assets    
Available-for-sale investment securities 1,747,658 1,232,826
Held-to-maturity investment securities 133,858 139,451
Stock in Federal Home Loan Bank 10,920 8,434
Loans, net 5,406,249 5,080,107
Mortgage-servicing rights 9,553 9,101
Derivative assets 129,806 25,179
Financial liabilities    
Deposit liabilities 558,177 769,825
Short-term borrowings—other than bank 137,783 185,710
Other bank borrowings 151,875 115,110
Long-term debt, net 2,068,852 1,964,365
Derivative liabilities 141,611 51,375
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,561,128 1,497,667
Short-term borrowings 49,948 88,987
Estimated fair value    
Financial assets    
Available-for-sale investment securities 1,747,658 1,232,826
Held-to-maturity investment securities 138,622 143,467
Stock in Federal Home Loan Bank 10,920 8,434
Loans, net 5,591,422 5,157,537
Mortgage-servicing rights 10,102 12,379
Derivative assets 5,271 300
Financial liabilities    
Deposit liabilities 563,169 765,976
Short-term borrowings—other than bank 137,783 185,710
Other bank borrowings 151,874 115,107
Long-term debt, net 2,440,950 2,156,927
Derivative liabilities 5,284 2,218
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,895,820 1,670,189
Short-term borrowings 49,948 88,987
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 0
Derivative liabilities 243 33
Estimated fair value | Level 1 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 0 0
Short-term borrowings 0 0
Estimated fair value | Level 2    
Financial assets    
Available-for-sale investment securities 1,720,473 1,204,229
Held-to-maturity investment securities 138,622 143,467
Stock in Federal Home Loan Bank 10,920 8,434
Loans, net 16,806 12,295
Mortgage-servicing rights 0 0
Derivative assets 5,271 300
Financial liabilities    
Deposit liabilities 563,169 765,976
Short-term borrowings—other than bank 137,783 185,710
Other bank borrowings 151,874 115,107
Long-term debt, net 2,440,950 2,156,927
Derivative liabilities 5,041 2,185
Estimated fair value | Level 2 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,895,820 1,670,189
Short-term borrowings 49,948 88,987
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 5,574,616 5,145,242
Mortgage-servicing rights 10,102 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 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 $ 0