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Fair value measurements - Carrying or Notional Amount, Fair Value and Placement in the Fair Value Hierarchy of the Company’s Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financial assets |  |
Available-for-sale investment securities | $ 1,061,687 | $ 1,136,439
Held-to-maturity investment securities | $ 1,058,691 |
Derivative asset, statement of financial position | Other | Other
Financial liabilities |  |
Other bank borrowings | $ 520,000 | $ 750,000
Derivative asset, statement of financial position |  | Other
Carrying or notional amount |  |
Financial assets |  |
Available-for-sale investment securities | 1,061,687 | $ 1,136,439
Held-to-maturity investment securities | 1,179,182 | 1,201,314
Loans, net | 5,977,249 | 6,121,606
Mortgage servicing rights | 7,906 | 8,169
Derivative assets | 41,122 | 16,880
Financial liabilities |  |
Deposit liabilities - time certificates | 1,048,825 | 1,063,907
Other bank borrowings | 520,000 | 750,000
Long-term debt, net | 2,838,224 | 2,842,429
Derivative liabilities |  | 28,449
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Long-term debt, net | 1,934,747 | 1,934,277
Estimated fair value |  |
Financial assets |  |
Available-for-sale investment securities | 1,061,687 | 1,136,439
Held-to-maturity investment securities | 1,058,691 | 1,103,668
Loans, net | 5,508,465 | 5,738,999
Mortgage servicing rights | 17,862 | 18,722
Derivative assets | 1,822 | 1,058
Financial liabilities |  |
Deposit liabilities - time certificates | 1,037,878 | 1,053,101
Other bank borrowings | 518,083 | 747,508
Long-term debt, net | 2,124,907 | 2,133,225
Derivative liabilities |  | 321
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Long-term debt, net | 1,380,338 | 1,385,025
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 | 5 | 0
Financial liabilities |  |
Deposit liabilities - time certificates | 0 | 0
Other bank borrowings | 0 | 0
Long-term debt, net | 0 | 0
Derivative liabilities |  | 18
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
Estimated fair value | Significant other observable inputs (Level 2) |  |
Financial assets |  |
Available-for-sale investment securities | 1,047,611 | 1,122,081
Held-to-maturity investment securities | 1,058,691 | 1,103,668
Loans, net | 13,899 | 15,176
Mortgage servicing rights | 0 | 0
Derivative assets | 1,817 | 1,058
Financial liabilities |  |
Deposit liabilities - time certificates | 1,037,878 | 1,053,101
Other bank borrowings | 518,083 | 747,508
Long-term debt, net | 2,124,907 | 2,133,225
Derivative liabilities |  | 303
Estimated fair value | Significant other observable inputs (Level 2) | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Long-term debt, net | 1,380,338 | 1,385,025
Estimated fair value | Significant unobservable inputs (Level 3) |  |
Financial assets |  |
Available-for-sale investment securities | 14,076 | 14,358
Held-to-maturity investment securities | 0 | 0
Loans, net | 5,494,566 | 5,723,823
Mortgage servicing rights | 17,862 | 18,722
Derivative assets | 0 | 0
Financial liabilities |  |
Deposit liabilities - time certificates | 0 | 0
Other bank borrowings | 0 | 0
Long-term debt, net | 0 | 0
Derivative liabilities |  | 0
Estimated fair value | Significant unobservable inputs (Level 3) | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Long-term debt, net | $ 0 | $ 0

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