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Fair value measurements - Fair Value Hierarchy of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financial assets    
Available-for-sale investment securities $ 1,388,533 $ 1,401,198
Held-to-maturity investment securities 142,057 44,412
Financial liabilities    
Short-term borrowings—other than bank 73,992 117,945
Other bank borrowings 110,040 190,859
Carrying or notional amount    
Financial assets    
Available-for-sale investment securities 1,388,533 1,401,198
Held-to-maturity investment securities 141,875 44,515
Stock in Federal Home Loan Bank 9,958 9,706
Loans, net 4,792,707 4,628,381
Mortgage servicing rights 8,062 8,639
Derivative assets 10,180 17,812
Financial liabilities    
Deposit liabilities1 827,841 5,890,597
Short-term borrowings—other than bank 73,992 117,945
Other bank borrowings 110,040 190,859
Long-term debt, net—other than bank 1,879,641 1,683,797
Derivative liabilities 34,132 13,562
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial assets    
Derivative assets   3,240
Financial liabilities    
Long-term debt, net—other than bank 1,418,802 1,368,479
Short-term borrowings 25,000 4,999
Estimated fair value    
Financial assets    
Available-for-sale investment securities 1,388,533 1,401,198
Held-to-maturity investment securities 142,057 44,412
Stock in Federal Home Loan Bank 9,958 9,706
Loans, net 4,802,053 4,781,751
Mortgage servicing rights 13,618 12,052
Derivative assets 91 393
Financial liabilities    
Deposit liabilities1 817,667 5,884,071
Short-term borrowings—other than bank 73,992 117,945
Other bank borrowings 110,037 190,829
Long-term debt, net—other than bank 1,904,261 1,813,295
Derivative liabilities 630 30
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial assets    
Derivative assets   256
Financial liabilities    
Long-term debt, net—other than bank 1,443,968 1,497,079
Short-term borrowings 25,000 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 liabilities1 0 0
Short-term borrowings—other than bank 0 0
Other bank borrowings 0 0
Long-term debt, net—other than bank 0 0
Derivative liabilities 34 20
Estimated fair value | Level 1 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial assets    
Derivative assets   0
Financial liabilities    
Long-term debt, net—other than bank 0 0
Short-term borrowings 0 0
Estimated fair value | Level 2    
Financial assets    
Available-for-sale investment securities 1,364,897 1,385,771
Held-to-maturity investment securities 142,057 44,412
Stock in Federal Home Loan Bank 9,958 9,706
Loans, net 1,809 11,254
Mortgage servicing rights 0 0
Derivative assets 91 393
Financial liabilities    
Deposit liabilities1 817,667 5,884,071
Short-term borrowings—other than bank 73,992 117,945
Other bank borrowings 110,037 190,829
Long-term debt, net—other than bank 1,904,261 1,813,295
Derivative liabilities 596 10
Estimated fair value | Level 2 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial assets    
Derivative assets   256
Financial liabilities    
Long-term debt, net—other than bank 1,443,968 1,497,079
Short-term borrowings 25,000 4,999
Estimated fair value | Level 3    
Financial assets    
Available-for-sale investment securities 23,636 15,427
Held-to-maturity investment securities 0 0
Stock in Federal Home Loan Bank 0 0
Loans, net 4,800,244 4,770,497
Mortgage servicing rights 13,618 12,052
Derivative assets 0 0
Financial liabilities    
Deposit liabilities1 0 0
Short-term borrowings—other than bank 0 0
Other bank borrowings 0 0
Long-term debt, net—other than bank 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—other than bank 0 0
Short-term borrowings $ 0 $ 0