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Fair value measurements - Summary of financial assets and liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Financial assets    
Available-for-sale investment securities $ 1,340,241 $ 1,232,826
Held-to-maturity investment securities 142,570 143,467
Financial liabilities    
Short-term borrowings—other than bank 99,956 185,710
Other bank borrowings 157,605 115,110
Carrying or notional amount    
Financial assets    
Available-for-sale investment securities 1,340,241 1,232,826
Held-to-maturity investment securities 134,656 139,451
Stock in Federal Home Loan Bank 9,760 8,434
Loans, net 5,122,003 5,080,107
Mortgage-servicing rights 9,120 9,101
Derivative assets 63,662 25,179
Financial liabilities    
Deposit liabilities 791,665 769,825
Short-term borrowings—other than bank 99,956 185,710
Other bank borrowings 157,605 115,110
Long-term debt, net 2,068,092 1,964,365
Derivative liabilities 74,800 51,375
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,510,635 1,497,667
Short-term borrowings 99,956 88,987
Estimated fair value    
Financial assets    
Available-for-sale investment securities 1,340,241 1,232,826
Held-to-maturity investment securities 142,570 143,467
Stock in Federal Home Loan Bank 9,760 8,434
Loans, net 5,306,098 5,157,537
Mortgage-servicing rights 10,350 12,379
Derivative assets 1,852 300
Financial liabilities    
Deposit liabilities 797,075 765,976
Short-term borrowings—other than bank 99,956 185,710
Other bank borrowings 157,606 115,107
Long-term debt, net 2,226,265 2,156,927
Derivative liabilities 5,160 2,218
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,655,449 1,670,189
Short-term borrowings 99,956 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 585 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 1,311,515 1,204,229
Held-to-maturity investment securities 142,570 143,467
Stock in Federal Home Loan Bank 9,760 8,434
Loans, net 18,155 12,295
Mortgage-servicing rights 0 0
Derivative assets 1,852 300
Financial liabilities    
Deposit liabilities 797,075 765,976
Short-term borrowings—other than bank 99,956 185,710
Other bank borrowings 157,606 115,107
Long-term debt, net 2,226,265 2,156,927
Derivative liabilities 4,575 2,185
Estimated fair value | Level 2 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,655,449 1,670,189
Short-term borrowings 99,956 88,987
Estimated fair value | Level 3    
Financial assets    
Available-for-sale investment securities 28,726 28,597
Held-to-maturity investment securities 0 0
Stock in Federal Home Loan Bank 0 0
Loans, net 5,287,943 5,145,242
Mortgage-servicing rights 10,350 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