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Fair value measurements - Summary of financial assets and liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Financial assets    
Available-for-sale investment securities $ 1,389,633 $ 1,232,826
Held-to-maturity investment securities 131,131 143,467
Financial liabilities    
Short-term borrowings—other than bank 131,180 185,710
Other bank borrowings 124,975 115,110
Carrying or notional amount    
Financial assets    
Available-for-sale investment securities 1,389,633 1,232,826
Held-to-maturity investment securities 124,623 139,451
Stock in Federal Home Loan Bank 9,880 8,434
Loans, net 5,393,653 5,080,107
Mortgage-servicing rights 9,647 9,101
Derivative assets 70,190 25,179
Financial liabilities    
Deposit liabilities 657,627 769,825
Short-term borrowings—other than bank 131,180 185,710
Other bank borrowings 124,975 115,110
Long-term debt, net 2,070,224 1,964,365
Derivative liabilities 81,861 51,375
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,574,955 1,497,667
Short-term borrowings 49,919 88,987
Estimated fair value    
Financial assets    
Available-for-sale investment securities 1,389,633 1,232,826
Held-to-maturity investment securities 131,131 143,467
Stock in Federal Home Loan Bank 9,880 8,434
Loans, net 5,577,395 5,157,537
Mortgage-servicing rights 10,328 12,379
Derivative assets 2,341 300
Financial liabilities    
Deposit liabilities 663,296 765,976
Short-term borrowings—other than bank 131,180 185,710
Other bank borrowings 124,966 115,107
Long-term debt, net 2,427,374 2,156,927
Derivative liabilities 5,130 2,218
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,895,365 1,670,189
Short-term borrowings 49,919 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 287 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 1,360,806 1,204,229
Held-to-maturity investment securities 131,131 143,467
Stock in Federal Home Loan Bank 9,880 8,434
Loans, net 37,345 12,295
Mortgage-servicing rights 0 0
Derivative assets 2,341 300
Financial liabilities    
Deposit liabilities 663,296 765,976
Short-term borrowings—other than bank 131,180 185,710
Other bank borrowings 124,966 115,107
Long-term debt, net 2,427,374 2,156,927
Derivative liabilities 4,843 2,185
Estimated fair value | Level 2 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,895,365 1,670,189
Short-term borrowings 49,919 88,987
Estimated fair value | Level 3    
Financial assets    
Available-for-sale investment securities 28,827 28,597
Held-to-maturity investment securities 0 0
Stock in Federal Home Loan Bank 0 0
Loans, net 5,540,050 5,145,242
Mortgage-servicing rights 10,328 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