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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 | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financial assets |  |
Available-for-sale investment securities | $ 1,084,083 | $ 1,136,439
Held-to-maturity investment securities | $ 1,086,205 |
Derivative asset, statement of financial position | Other | Other
Financial liabilities |  |
Other bank borrowings | $ 520,000 | $ 750,000
Derivative liabilities, statement of financial position | Other | Other
Carrying or notional amount |  |
Financial assets |  |
Available-for-sale investment securities | $ 1,084,083 | $ 1,136,439
Held-to-maturity investment securities | 1,159,229 | 1,201,314
Stock in Federal Home Loan Bank | 29,204 | 14,728
Loans, net | 5,975,318 | 6,121,606
Mortgage servicing rights | 7,722 | 8,169
Derivative assets | 16,991 | 16,880
Financial liabilities |  |
Deposit liabilities - time certificates | 1,064,978 | 1,063,907
Other bank borrowings | 520,000 | 750,000
Long-term debt, net | 2,836,539 | 2,842,429
Derivative liabilities | 21,867 | 28,449
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Long-term debt, net | 1,934,980 | 1,934,277
Estimated fair value |  |
Financial assets |  |
Available-for-sale investment securities | 1,084,083 | 1,136,439
Held-to-maturity investment securities | 1,086,205 | 1,103,668
Stock in Federal Home Loan Bank | 29,204 | 14,728
Loans, net | 5,672,330 | 5,738,999
Mortgage servicing rights | 17,046 | 18,722
Derivative assets | 802 | 1,058
Financial liabilities |  |
Deposit liabilities - time certificates | 1,058,464 | 1,053,101
Other bank borrowings | 520,677 | 747,508
Long-term debt, net | 2,289,207 | 2,133,225
Derivative liabilities | 116 | 321
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Long-term debt, net | 1,519,620 | 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
Stock in Federal Home Loan Bank | 0 | 0
Loans, net | 0 | 0
Mortgage servicing rights | 0 | 0
Derivative assets | 10 | 0
Financial liabilities |  |
Deposit liabilities - time certificates | 0 | 0
Other bank borrowings | 0 | 0
Long-term debt, net | 0 | 0
Derivative liabilities | 0 | 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 | 1,070,148 | 1,122,081
Held-to-maturity investment securities | 1,086,205 | 1,103,668
Stock in Federal Home Loan Bank | 29,204 | 14,728
Loans, net | 2,698 | 15,176
Mortgage servicing rights | 0 | 0
Derivative assets | 792 | 1,058
Financial liabilities |  |
Deposit liabilities - time certificates | 1,058,464 | 1,053,101
Other bank borrowings | 520,677 | 747,508
Long-term debt, net | 2,289,207 | 2,133,225
Derivative liabilities | 116 | 303
Estimated fair value | Significant other observable inputs (Level 2) | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Long-term debt, net | 1,519,620 | 1,385,025
Estimated fair value | Significant unobservable inputs (Level 3) |  |
Financial assets |  |
Available-for-sale investment securities | 13,935 | 14,358
Held-to-maturity investment securities | 0 | 0
Stock in Federal Home Loan Bank | 0 | 0
Loans, net | 5,669,632 | 5,723,823
Mortgage servicing rights | 17,046 | 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 | 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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