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Fair value measurements - Summary of financial assets and liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financial assets |  |
Available-for-sale investment securities | $ 1,228,922 | $ 1,105,182
Financial liabilities |  |
Short-term borrowings—other than bank | 2,300 | 0
Other bank borrowings | 200,154 | 192,618
Carrying or notional amount |  |
Financial assets |  |
Money market funds | 6 | 13,085
Available-for-sale investment securities | 1,228,922 | 1,105,182
Stock in Federal Home Loan Bank | 11,706 | 11,218
Loans receivable, net | 4,679,728 | 4,701,977
Mortgage-servicing rights | 9,294 | 9,373
Bank-owned life insurance | 144,661 | 143,197
Derivative assets | 22,986 | 23,578
Financial liabilities |  |
Deposit liabilities | 5,675,090 | 5,548,929
Short-term borrowings—other than bank | 2,300 | 0
Other bank borrowings | 200,154 | 192,618
Long-term debt, net | 1,618,651 | 1,619,019
Derivative liabilities | 36,743 | 53,852
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Long-term debt, net | 1,318,871 | 1,319,260
Derivative liabilities | 15,838 | 20,734
Short-term borrowings | 1,500 |
Estimated fair value |  |
Financial assets |  |
Money market funds | 6 | 13,085
Available-for-sale investment securities | 1,228,922 | 1,105,182
Stock in Federal Home Loan Bank | 11,706 | 11,218
Loans receivable, net | 4,826,980 | 4,852,826
Mortgage-servicing rights | 13,650 | 13,216
Bank-owned life insurance | 144,661 | 143,197
Derivative assets | 317 | 453
Financial liabilities |  |
Deposit liabilities | 5,671,729 | 5,546,644
Short-term borrowings—other than bank | 2,300 | 0
Other bank borrowings | 201,000 | 193,991
Long-term debt, net | 1,707,954 | 1,704,717
Derivative liabilities | 381 | 952
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Long-term debt, net | 1,402,690 | 1,399,490
Derivative liabilities | 277 | 743
Short-term borrowings | 1,500 |
Estimated fair value | Level 1 |  |
Financial assets |  |
Money market funds | 0 | 0
Available-for-sale investment securities | 0 | 0
Stock in Federal Home Loan Bank | 0 | 0
Loans receivable, net | 0 | 0
Mortgage-servicing rights | 0 | 0
Bank-owned life insurance | 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 | 98 | 129
Estimated fair value | Level 1 | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Long-term debt, net | 0 | 0
Derivative liabilities | 0 | 0
Short-term borrowings | 0 |
Estimated fair value | Level 2 |  |
Financial assets |  |
Money market funds | 6 | 13,085
Available-for-sale investment securities | 1,213,495 | 1,089,755
Stock in Federal Home Loan Bank | 11,706 | 11,218
Loans receivable, net | 10,881 | 13,333
Mortgage-servicing rights | 0 | 0
Bank-owned life insurance | 144,661 | 143,197
Derivative assets | 317 | 453
Financial liabilities |  |
Deposit liabilities | 5,671,729 | 5,546,644
Short-term borrowings—other than bank | 2,300 | 0
Other bank borrowings | 201,000 | 193,991
Long-term debt, net | 1,707,954 | 1,704,717
Derivative liabilities | 283 | 823
Estimated fair value | Level 2 | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Long-term debt, net | 1,402,690 | 1,399,490
Derivative liabilities | 277 | 743
Short-term borrowings | 1,500 |
Estimated fair value | Level 3 |  |
Financial assets |  |
Money market funds | 0 | 0
Available-for-sale investment securities | 15,427 | 15,427
Stock in Federal Home Loan Bank | 0 | 0
Loans receivable, net | 4,816,099 | 4,839,493
Mortgage-servicing rights | 13,650 | 13,216
Bank-owned life insurance | 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 | 0 | 0
Estimated fair value | Level 3 | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial liabilities |  |
Long-term debt, net | 0 | 0
Derivative liabilities | 0 | $ 0
Short-term borrowings | $ 0 |

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- Definition Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Surrender Value -URI http://asc.fasb.org/extlink&oid=6507153 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
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- Definition Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=29638263&loc=d3e39828-111592 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Glossary Loan -URI http://asc.fasb.org/extlink&oid=6517073 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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