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Fair value measurements - Fair Value Hierarchy of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financial assets |  |
Available-for-sale investment securities | $ 1,429,667 | $ 2,574,618
Held-to-maturity investment securities | 1,150,971 |
Derivative asset, statement of financial position |  | Other
Financial liabilities |  |
Short-term borrowings—other than bank | 172,568 | $ 53,998
Other bank borrowings | $ 695,120 | 88,305
Derivative liability, statement of financial position | Other |
Carrying or notional amount |  |
Financial assets |  |
Available-for-sale investment securities | $ 1,429,667 | 2,574,618
Held-to-maturity investment securities | 1,251,747 | 522,270
Loans, net | 5,907,514 | 5,150,388
Mortgage servicing rights | 9,047 | 9,950
Derivative assets | 16,220 | 57,377
Financial liabilities |  |
Deposit liabilities | 611,718 | 423,976
Short-term borrowings—other than bank | 172,568 | 53,998
Other bank borrowings | 695,120 | 88,305
Long-term debt, net | 2,384,980 | 2,321,937
Derivative liabilities | 22,949 | 57,000
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Short-term borrowings | 87,967 |
Long-term debt, net | 1,684,816 | 1,676,402
Estimated fair value |  |
Financial assets |  |
Available-for-sale investment securities | 1,429,667 | 2,574,618
Held-to-maturity investment securities | 1,150,971 | 510,474
Loans, net | 5,454,202 | 5,228,524
Mortgage servicing rights | 17,646 | 14,480
Derivative assets | 1,348 | 909
Financial liabilities |  |
Deposit liabilities | 597,617 | 442,361
Short-term borrowings—other than bank | 172,568 | 53,998
Other bank borrowings | 695,095 | 88,304
Long-term debt, net | 2,122,605 | 2,624,130
Derivative liabilities | 472 | 5,282
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Short-term borrowings | 87,967 |
Long-term debt, net | 1,487,496 | 1,955,710
Estimated fair value | 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 | 18 | 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 | Level 1 | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Short-term borrowings | 0 |
Long-term debt, net | 0 | 0
Estimated fair value | Level 2 |  |
Financial assets |  |
Available-for-sale investment securities | 1,414,765 | 2,559,191
Held-to-maturity investment securities | 1,150,971 | 510,474
Loans, net | 821 | 10,403
Mortgage servicing rights | 0 | 0
Derivative assets | 1,330 | 909
Financial liabilities |  |
Deposit liabilities | 597,617 | 442,361
Short-term borrowings—other than bank | 172,568 | 53,998
Other bank borrowings | 695,095 | 88,304
Long-term debt, net | 2,122,605 | 2,624,130
Derivative liabilities | 472 | 5,271
Estimated fair value | Level 2 | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Short-term borrowings | 87,967 |
Long-term debt, net | 1,487,496 | 1,955,710
Estimated fair value | Level 3 |  |
Financial assets |  |
Available-for-sale investment securities | 14,902 | 15,427
Held-to-maturity investment securities | 0 | 0
Loans, net | 5,453,381 | 5,218,121
Mortgage servicing rights | 17,646 | 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 | Level 3 | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Short-term borrowings | 0 |
Long-term debt, net | $ 0 | $ 0

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- Definition This element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This item represents other bank borrowings as of the balance sheet date, including securities sold under agreements to repurchase and advances from the Federal Home Loan Bank. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=SL120269820-111563 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI https://asc.fasb.org/subtopic&trid=2196772 + Details
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