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Fair value measurements - Summary of financial assets and liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financial assets |  |
Available-for-sale investment securities | $ 2,621,375 | $ 2,574,618
Held-to-maturity investment securities | 466,236 |
Financial liabilities |  |
Short-term borrowings—other than bank | 71,491 | 53,998
Other bank borrowings | 137,385 | 88,305
Carrying or notional amount |  |
Financial assets |  |
Available-for-sale investment securities | 2,621,375 | 2,574,618
Held-to-maturity investment securities | 517,150 | 522,270
Loans, net | 5,125,483 | 5,150,388
Mortgage-servicing rights | 10,024 | 9,950
Derivative assets | 30,043 | 57,377
Financial liabilities |  |
Deposit liabilities | 394,015 | 423,976
Short-term borrowings—other than bank | 71,491 | 53,998
Other bank borrowings | 137,385 | 88,305
Long-term debt, net | 2,316,046 | 2,321,937
Derivative liabilities | 31,049 | 57,000
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Long-term debt, net | 1,676,581 | 1,676,402
Short-term borrowings | 6,000 |
Estimated fair value |  |
Financial assets |  |
Available-for-sale investment securities | 2,621,375 | 2,574,618
Held-to-maturity investment securities | 466,236 | 510,474
Loans, net | 5,021,932 | 5,228,524
Mortgage-servicing rights | 16,274 | 14,480
Derivative assets | 992 | 909
Financial liabilities |  |
Deposit liabilities | 386,547 | 442,361
Short-term borrowings—other than bank | 71,491 | 53,998
Other bank borrowings | 137,383 | 88,304
Long-term debt, net | 2,390,702 | 2,624,130
Derivative liabilities | 1,704 | 5,282
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Long-term debt, net | 1,765,004 | 1,955,710
Short-term borrowings | 6,000 |
Estimated fair value | Quoted prices in active markets for identical assets (Level 1) |  |
Financial assets |  |
Available-for-sale investment securities | 0 | 0
Held-to-maturity investment securities | 0 | 0
Loans, net | 0 | 0
Mortgage-servicing rights | 0 | 0
Derivative assets | 168 | 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 | 11
Estimated fair value | Quoted prices in active markets for identical assets (Level 1) | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Long-term debt, net | 0 | 0
Short-term borrowings | 0 |
Estimated fair value | Significant other observable inputs (Level 2) |  |
Financial assets |  |
Available-for-sale investment securities | 2,606,079 | 2,559,191
Held-to-maturity investment securities | 466,236 | 510,474
Loans, net | 7,932 | 10,403
Mortgage-servicing rights | 0 | 0
Derivative assets | 824 | 909
Financial liabilities |  |
Deposit liabilities | 386,547 | 442,361
Short-term borrowings—other than bank | 71,491 | 53,998
Other bank borrowings | 137,383 | 88,304
Long-term debt, net | 2,390,702 | 2,624,130
Derivative liabilities | 1,704 | 5,271
Estimated fair value | Significant other observable inputs (Level 2) | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Long-term debt, net | 1,765,004 | 1,955,710
Short-term borrowings | 6,000 |
Estimated fair value | Significant unobservable inputs (Level 3) |  |
Financial assets |  |
Available-for-sale investment securities | 15,296 | 15,427
Held-to-maturity investment securities | 0 | 0
Loans, net | 5,014,000 | 5,218,121
Mortgage-servicing rights | 16,274 | 14,480
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 | Significant unobservable inputs (Level 3) | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Long-term debt, net | 0 | $ 0
Short-term borrowings | $ 0 |

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