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Fair value measurements - Summary of financial assets and liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financial assets    
Available-for-sale investment securities $ 1,409,528 $ 1,401,198
Held-to-maturity investment securities 61,444 44,412
Financial liabilities    
Short-term borrowings—other than bank 202,857 117,945
Other bank borrowings 126,930 190,859
Carrying or notional amount    
Financial assets    
Available-for-sale investment securities 1,409,528 1,401,198
Held-to-maturity investment securities 62,630 44,515
Stock in Federal Home Loan Bank 10,158 9,706
Loans, net 4,727,189 4,628,381
Mortgage-servicing rights 8,509 8,639
Derivative assets 24,537 17,812
Financial liabilities    
Deposit liabilities 757,265 5,890,597
Short-term borrowings—other than bank 202,857 117,945
Other bank borrowings 126,930 190,859
Long-term debt, net 1,783,009 1,683,797
Derivative liabilities 25,445 13,562
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial assets    
Derivative assets   3,240
Financial liabilities    
Long-term debt, net 1,468,457 1,368,479
Derivative liabilities 3,117  
Short-term borrowings 91,880 4,999
Estimated fair value    
Financial assets    
Available-for-sale investment securities 1,409,528 1,401,198
Held-to-maturity investment securities 61,444 44,412
Stock in Federal Home Loan Bank 10,158 9,706
Loans, net 4,779,329 4,781,751
Mortgage-servicing rights 13,423 12,052
Derivative assets 250 393
Financial liabilities    
Deposit liabilities 745,295 5,884,071
Short-term borrowings—other than bank 202,857 117,945
Other bank borrowings 126,904 190,829
Long-term debt, net 1,816,310 1,813,295
Derivative liabilities 170 30
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial assets    
Derivative assets   256
Financial liabilities    
Long-term debt, net 1,511,103 1,497,079
Derivative liabilities 106  
Short-term borrowings 91,880 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 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 56 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 1,394,101 1,385,771
Held-to-maturity investment securities 61,444 44,412
Stock in Federal Home Loan Bank 10,158 9,706
Loans, net 5,250 11,254
Mortgage-servicing rights 0 0
Derivative assets 250 393
Financial liabilities    
Deposit liabilities 745,295 5,884,071
Short-term borrowings—other than bank 202,857 117,945
Other bank borrowings 126,904 190,829
Long-term debt, net 1,816,310 1,813,295
Derivative liabilities 114 10
Estimated fair value | Level 2 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial assets    
Derivative assets   256
Financial liabilities    
Long-term debt, net 1,511,103 1,497,079
Derivative liabilities 106  
Short-term borrowings 91,880 4,999
Estimated fair value | Level 3    
Financial assets    
Available-for-sale investment securities 15,427 15,427
Held-to-maturity investment securities 0 0
Stock in Federal Home Loan Bank 0 0
Loans, net 4,774,079 4,770,497
Mortgage-servicing rights 13,423 12,052
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 assets    
Derivative assets   0
Financial liabilities    
Long-term debt, net 0 0
Derivative liabilities 0  
Short-term borrowings $ 0 $ 0