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Fair value measurements - Summary of financial assets and liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financial assets |  |
Available-for-sale investment securities | $ 1,340,241 | $ 1,232,826
Held-to-maturity investment securities | 142,570 | 143,467
Financial liabilities |  |
Short-term borrowings—other than bank | 99,956 | 185,710
Other bank borrowings | 157,605 | 115,110
Carrying or notional amount |  |
Financial assets |  |
Available-for-sale investment securities | 1,340,241 | 1,232,826
Held-to-maturity investment securities | 134,656 | 139,451
Stock in Federal Home Loan Bank | 9,760 | 8,434
Loans, net | 5,122,003 | 5,080,107
Mortgage-servicing rights | 9,120 | 9,101
Derivative assets | 63,662 | 25,179
Financial liabilities |  |
Deposit liabilities | 791,665 | 769,825
Short-term borrowings—other than bank | 99,956 | 185,710
Other bank borrowings | 157,605 | 115,110
Long-term debt, net | 2,068,092 | 1,964,365
Derivative liabilities | 74,800 | 51,375
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Long-term debt, net | 1,510,635 | 1,497,667
Short-term borrowings | 99,956 | 88,987
Estimated fair value |  |
Financial assets |  |
Available-for-sale investment securities | 1,340,241 | 1,232,826
Held-to-maturity investment securities | 142,570 | 143,467
Stock in Federal Home Loan Bank | 9,760 | 8,434
Loans, net | 5,306,098 | 5,157,537
Mortgage-servicing rights | 10,350 | 12,379
Derivative assets | 1,852 | 300
Financial liabilities |  |
Deposit liabilities | 797,075 | 765,976
Short-term borrowings—other than bank | 99,956 | 185,710
Other bank borrowings | 157,606 | 115,107
Long-term debt, net | 2,226,265 | 2,156,927
Derivative liabilities | 5,160 | 2,218
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Long-term debt, net | 1,655,449 | 1,670,189
Short-term borrowings | 99,956 | 88,987
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 | 585 | 33
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 | 1,311,515 | 1,204,229
Held-to-maturity investment securities | 142,570 | 143,467
Stock in Federal Home Loan Bank | 9,760 | 8,434
Loans, net | 18,155 | 12,295
Mortgage-servicing rights | 0 | 0
Derivative assets | 1,852 | 300
Financial liabilities |  |
Deposit liabilities | 797,075 | 765,976
Short-term borrowings—other than bank | 99,956 | 185,710
Other bank borrowings | 157,606 | 115,107
Long-term debt, net | 2,226,265 | 2,156,927
Derivative liabilities | 4,575 | 2,185
Estimated fair value | Level 2 | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Long-term debt, net | 1,655,449 | 1,670,189
Short-term borrowings | 99,956 | 88,987
Estimated fair value | Level 3 |  |
Financial assets |  |
Available-for-sale investment securities | 28,726 | 28,597
Held-to-maturity investment securities | 0 | 0
Stock in Federal Home Loan Bank | 0 | 0
Loans, net | 5,287,943 | 5,145,242
Mortgage-servicing rights | 10,350 | 12,379
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

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