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Fair value measurements - Summary of financial assets and liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Financial assets    
Available-for-sale investment securities $ 1,348,263 $ 1,388,533
Held-to-maturity investment securities 142,333 142,057
Financial liabilities    
Short-term borrowings—other than bank 110,399 73,992
Other bank borrowings 89,870 110,040
Carrying or notional amount    
Financial assets    
Available-for-sale investment securities 1,348,263 1,388,533
Held-to-maturity investment securities 140,203 141,875
Stock in Federal Home Loan Bank 9,434 9,958
Loans, net 4,812,019 4,792,707
Mortgage-servicing rights 7,897 8,062
Derivative assets 38,755 10,180
Financial liabilities    
Deposit liabilities 780,296 827,841
Short-term borrowings—other than bank 110,399 73,992
Other bank borrowings 89,870 110,040
Long-term debt, net 1,880,339 1,879,641
Derivative liabilities 50,815 34,132
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,418,973 1,418,802
Short-term borrowings 55,999 25,000
Estimated fair value    
Financial assets    
Available-for-sale investment securities 1,348,263 1,388,533
Held-to-maturity investment securities 142,333 142,057
Stock in Federal Home Loan Bank 9,434 9,958
Loans, net 4,857,031 4,802,053
Mortgage-servicing rights 13,046 13,618
Derivative assets 472 91
Financial liabilities    
Deposit liabilities 773,168 817,667
Short-term borrowings—other than bank 110,399 73,992
Other bank borrowings 89,867 110,037
Long-term debt, net 1,968,642 1,904,261
Derivative liabilities 1,301 630
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,499,417 1,443,968
Short-term borrowings 55,999 25,000
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 141 34
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 1,320,293 1,364,897
Held-to-maturity investment securities 142,333 142,057
Stock in Federal Home Loan Bank 9,434 9,958
Loans, net 8,146 1,809
Mortgage-servicing rights 0 0
Derivative assets 472 91
Financial liabilities    
Deposit liabilities 773,168 817,667
Short-term borrowings—other than bank 110,399 73,992
Other bank borrowings 89,867 110,037
Long-term debt, net 1,968,642 1,904,261
Derivative liabilities 1,160 596
Estimated fair value | Level 2 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,499,417 1,443,968
Short-term borrowings 55,999 25,000
Estimated fair value | Level 3    
Financial assets    
Available-for-sale investment securities 27,970 23,636
Held-to-maturity investment securities 0 0
Stock in Federal Home Loan Bank 0 0
Loans, net 4,848,885 4,800,244
Mortgage-servicing rights 13,046 13,618
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