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Fair value measurements - Fair Value Hierarchy of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financial assets    
Available-for-sale investment securities $ 1,401,198 $ 1,105,182
Held-to-maturity investment securities 44,412  
Financial liabilities    
Other bank borrowings 190,859 192,618
Carrying or notional amount    
Financial assets    
Money market funds   13,085
Available-for-sale investment securities 1,401,198 1,105,182
Held-to-maturity investment securities 44,515  
Stock in Federal Home Loan Bank 9,706 11,218
Loans receivable, net 4,628,381 4,701,977
Mortgage servicing rights 8,639 9,373
Derivative assets 17,812 23,578
Financial liabilities    
Deposit liabilities 5,890,597 5,548,929
Short-term borrowings 117,945  
Other bank borrowings 190,859 192,618
Long-term debt, net—other than bank 1,683,797 1,619,019
Derivative liabilities 13,562 53,852
Estimated fair value    
Financial assets    
Money market funds   13,085
Available-for-sale investment securities 1,401,198 1,105,182
Held-to-maturity investment securities 44,412  
Stock in Federal Home Loan Bank 9,706 11,218
Loans receivable, net 4,781,751 4,852,826
Mortgage servicing rights 12,052 13,216
Derivative assets 393 453
Financial liabilities    
Deposit liabilities 5,884,071 5,546,644
Short-term borrowings 117,945  
Other bank borrowings 190,829 193,991
Long-term debt, net—other than bank 1,813,295 1,704,717
Derivative liabilities 30 952
Estimated fair value | Level 1    
Financial assets    
Money market funds   0
Available-for-sale investment securities 0 0
Held-to-maturity investment securities 0  
Stock in Federal Home Loan Bank 0 0
Loans receivable, net 0 0
Mortgage servicing rights 0 0
Derivative assets 0 0
Financial liabilities    
Deposit liabilities 0 0
Short-term borrowings 0  
Other bank borrowings 0 0
Long-term debt, net—other than bank 0 0
Derivative liabilities 20 129
Estimated fair value | Level 2    
Financial assets    
Money market funds   13,085
Available-for-sale investment securities 1,385,771 1,089,755
Held-to-maturity investment securities 44,412  
Stock in Federal Home Loan Bank 9,706 11,218
Loans receivable, net 11,254 13,333
Mortgage servicing rights 0 0
Derivative assets 393 453
Financial liabilities    
Deposit liabilities 5,884,071 5,546,644
Short-term borrowings 117,945  
Other bank borrowings 190,829 193,991
Long-term debt, net—other than bank 1,813,295 1,704,717
Derivative liabilities 10 823
Estimated fair value | Level 3    
Financial assets    
Money market funds   0
Available-for-sale investment securities 15,427 15,427
Held-to-maturity investment securities 0  
Stock in Federal Home Loan Bank 0 0
Loans receivable, net 4,770,497 4,839,493
Mortgage servicing rights 12,052 13,216
Derivative assets 0 0
Financial liabilities    
Deposit liabilities 0 0
Short-term borrowings 0  
Other bank borrowings 0 0
Long-term debt, net—other than bank 0 0
Derivative liabilities 0 0
Hawaiian Electric Company, Inc. and Subsidiaries | Carrying or notional amount    
Financial assets    
Derivative assets 3,240  
Financial liabilities    
Short-term borrowings 4,999  
Long-term debt, net—other than bank 1,368,479 1,319,260
Derivative liabilities   20,734
Hawaiian Electric Company, Inc. and Subsidiaries | Estimated fair value    
Financial assets    
Derivative assets 256  
Financial liabilities    
Short-term borrowings 4,999  
Long-term debt, net—other than bank 1,497,079 1,399,490
Derivative liabilities   743
Hawaiian Electric Company, Inc. and Subsidiaries | Estimated fair value | Level 1    
Financial assets    
Derivative assets 0  
Financial liabilities    
Short-term borrowings 0  
Long-term debt, net—other than bank 0 0
Derivative liabilities   0
Hawaiian Electric Company, Inc. and Subsidiaries | Estimated fair value | Level 2    
Financial assets    
Derivative assets 256  
Financial liabilities    
Short-term borrowings 4,999  
Long-term debt, net—other than bank 1,497,079 1,399,490
Derivative liabilities   743
Hawaiian Electric Company, Inc. and Subsidiaries | Estimated fair value | Level 3    
Financial assets    
Derivative assets 0  
Financial liabilities    
Short-term borrowings 0  
Long-term debt, net—other than bank $ 0 0
Derivative liabilities   $ 0