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Fair value measurements - Summary of financial assets and liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Financial assets    
Available-for-sale investment securities $ 1,387,571 $ 1,401,198
Held-to-maturity investment securities 99,929 44,412
Financial liabilities    
Short-term borrowings—other than bank 203,359 117,945
Other bank borrowings 71,110 190,859
Carrying or notional amount    
Financial assets    
Available-for-sale investment securities 1,387,571 1,401,198
Held-to-maturity investment securities 102,498 44,515
Stock in Federal Home Loan Bank 8,158 9,706
Loans, net 4,701,268 4,628,381
Mortgage-servicing rights 8,426 8,639
Derivative assets   17,812
Financial liabilities    
Deposit liabilities 805,117 5,890,597
Short-term borrowings—other than bank 203,359 117,945
Other bank borrowings 71,110 190,859
Long-term debt, net 1,782,242 1,683,797
Derivative liabilities 3,023 13,562
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial assets    
Derivative assets   3,240
Financial liabilities    
Long-term debt, net 1,468,624 1,368,479
Derivative liabilities 3,023  
Short-term borrowings 85,913 4,999
Estimated fair value    
Financial assets    
Available-for-sale investment securities 1,387,571 1,401,198
Held-to-maturity investment securities 99,929 44,412
Stock in Federal Home Loan Bank 8,158 9,706
Loans, net 4,672,666 4,781,751
Mortgage-servicing rights 13,443 12,052
Derivative assets   393
Financial liabilities    
Deposit liabilities 791,753 5,884,071
Short-term borrowings—other than bank 203,359 117,945
Other bank borrowings 71,107 190,829
Long-term debt, net 1,805,682 1,813,295
Derivative liabilities 27 30
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial assets    
Derivative assets   256
Financial liabilities    
Long-term debt, net 1,503,508 1,497,079
Derivative liabilities 27  
Short-term borrowings 85,913 4,999
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
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 20
Estimated fair value | Level 1 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial assets    
Derivative assets   0
Financial liabilities    
Long-term debt, net 0 0
Derivative liabilities 0  
Short-term borrowings 0 0
Estimated fair value | Level 2    
Financial assets    
Available-for-sale investment securities 1,368,487 1,385,771
Held-to-maturity investment securities 99,929 44,412
Stock in Federal Home Loan Bank 8,158 9,706
Loans, net 1,031 11,254
Mortgage-servicing rights 0 0
Derivative assets   393
Financial liabilities    
Deposit liabilities 791,753 5,884,071
Short-term borrowings—other than bank 203,359 117,945
Other bank borrowings 71,107 190,829
Long-term debt, net 1,805,682 1,813,295
Derivative liabilities 27 10
Estimated fair value | Level 2 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial assets    
Derivative assets   256
Financial liabilities    
Long-term debt, net 1,503,508 1,497,079
Derivative liabilities 27  
Short-term borrowings 85,913 4,999
Estimated fair value | Level 3    
Financial assets    
Available-for-sale investment securities 19,084 15,427
Held-to-maturity investment securities 0 0
Stock in Federal Home Loan Bank 0 0
Loans, net 4,671,635 4,770,497
Mortgage-servicing rights 13,443 12,052
Derivative assets   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 assets    
Derivative assets   0
Financial liabilities    
Long-term debt, net 0 0
Derivative liabilities 0  
Short-term borrowings $ 0 $ 0