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Fair value measurements - Summary of financial assets and liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Financial assets    
Available-for-sale investment securities $ 1,210,748 $ 1,388,533
Held-to-maturity investment securities 137,497 142,057
Financial liabilities    
Short-term borrowings—other than bank 163,836 73,992
Other bank borrowings 129,190 110,040
Carrying or notional amount    
Financial assets    
Available-for-sale investment securities 1,210,748 1,388,533
Held-to-maturity investment securities 132,704 141,875
Stock in Federal Home Loan Bank 9,953 9,958
Loans, net 5,048,411 4,792,707
Mortgage-servicing rights 8,567 8,062
Derivative assets 58,473 10,180
Financial liabilities    
Deposit liabilities 783,308 827,841
Short-term borrowings—other than bank 163,836 73,992
Other bank borrowings 129,190 110,040
Long-term debt, net 1,885,454 1,879,641
Derivative liabilities 63,391 34,132
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,418,220 1,418,802
Short-term borrowings 112,353 25,000
Estimated fair value    
Financial assets    
Available-for-sale investment securities 1,210,748 1,388,533
Held-to-maturity investment securities 137,497 142,057
Stock in Federal Home Loan Bank 9,953 9,958
Loans, net 5,138,439 4,802,053
Mortgage-servicing rights 11,485 13,618
Derivative assets 486 91
Financial liabilities    
Deposit liabilities 779,370 817,667
Short-term borrowings—other than bank 163,836 73,992
Other bank borrowings 129,187 110,037
Long-term debt, net 2,085,217 1,904,261
Derivative liabilities 2,919 630
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,594,271 1,443,968
Short-term borrowings 112,353 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 2 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 18 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 1,182,289 1,364,897
Held-to-maturity investment securities 137,497 142,057
Stock in Federal Home Loan Bank 9,953 9,958
Loans, net 17,164 1,809
Mortgage-servicing rights 0 0
Derivative assets 484 91
Financial liabilities    
Deposit liabilities 779,370 817,667
Short-term borrowings—other than bank 163,836 73,992
Other bank borrowings 129,187 110,037
Long-term debt, net 2,085,217 1,904,261
Derivative liabilities 2,901 596
Estimated fair value | Level 2 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Long-term debt, net 1,594,271 1,443,968
Short-term borrowings 112,353 25,000
Estimated fair value | Level 3    
Financial assets    
Available-for-sale investment securities 28,459 23,636
Held-to-maturity investment securities 0 0
Stock in Federal Home Loan Bank 0 0
Loans, net 5,121,275 4,800,244
Mortgage-servicing rights 11,485 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