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Fair value measurements - Summary of financial assets and liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Financial assets    
Available-for-sale investment securities $ 1,298,010 $ 1,388,533
Held-to-maturity investment securities 141,231 142,057
Financial liabilities    
Short-term borrowings—other than bank 211,893 73,992
Other bank borrowings 111,485 110,040
Carrying or notional amount    
Financial assets    
Available-for-sale investment securities 1,298,010 1,388,533
Held-to-maturity investment securities 137,029 141,875
Stock in Federal Home Loan Bank 8,434 9,958
Loans, net 4,959,260 4,792,707
Mortgage-servicing rights 8,103 8,062
Derivative assets 46,051 10,180
Financial liabilities    
Deposit liabilities 855,745 827,841
Short-term borrowings—other than bank 211,893 73,992
Other bank borrowings 111,485 110,040
Long-term debt, net 1,884,030 1,879,641
Derivative liabilities 59,981 34,132
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,417,917 1,418,802
Short-term borrowings 161,901 25,000
Estimated fair value    
Financial assets    
Available-for-sale investment securities 1,298,010 1,388,533
Held-to-maturity investment securities 141,231 142,057
Stock in Federal Home Loan Bank 8,434 9,958
Loans, net 5,038,775 4,802,053
Mortgage-servicing rights 12,240 13,618
Derivative assets 483 91
Financial liabilities    
Deposit liabilities 850,123 817,667
Short-term borrowings—other than bank 211,893 73,992
Other bank borrowings 111,480 110,037
Long-term debt, net 2,036,486 1,904,261
Derivative liabilities 2,144 630
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,551,097 1,443,968
Short-term borrowings 161,901 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 78 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 1,269,844 1,364,897
Held-to-maturity investment securities 141,231 142,057
Stock in Federal Home Loan Bank 8,434 9,958
Loans, net 9,233 1,809
Mortgage-servicing rights 0 0
Derivative assets 483 91
Financial liabilities    
Deposit liabilities 850,123 817,667
Short-term borrowings—other than bank 211,893 73,992
Other bank borrowings 111,480 110,037
Long-term debt, net 2,036,486 1,904,261
Derivative liabilities 2,066 596
Estimated fair value | Level 2 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,551,097 1,443,968
Short-term borrowings 161,901 25,000
Estimated fair value | Level 3    
Financial assets    
Available-for-sale investment securities 28,166 23,636
Held-to-maturity investment securities 0 0
Stock in Federal Home Loan Bank 0 0
Loans, net 5,029,542 4,800,244
Mortgage-servicing rights 12,240 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