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Fair value measurements - Summary of financial assets and liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financial assets |  |
Available-for-sale investment securities, at fair value | $ 906,295 | $ 820,648
Financial liabilities |  |
Short-term borrowings—other than bank | 95,485 | 103,063
Other bank borrowings | 329,081 | 328,582
Carrying or notional amount |  |
Financial assets |  |
Money market funds | 10 | 10
Available-for-sale investment securities, at fair value | 906,295 | 820,648
Stock in Federal Home Loan Bank | 11,218 | 10,678
Loans receivable, net | 4,597,850 | 4,570,412
Mortgage-servicing rights | 8,857 | 8,884
Bank-owned life insurance | 138,732 | 138,139
Derivative assets | 63,470 | 22,616
Financial liabilities |  |
Deposit liabilities | 5,139,932 | 5,025,254
Short-term borrowings—other than bank | 95,485 | 103,063
Other bank borrowings | 329,081 | 328,582
Long-term debt, net—other than bank | 1,578,618 | 1,578,368
Derivative liabilities | 30,516 | 23,269
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial assets |  |
Derivative assets | 31,335 |
Financial liabilities |  |
The Utilities’ short-term borrowings (included in amount above) | 12,998 |
Long-term debt, net—other than bank | 1,278,916 | 1,278,702
Estimated fair value |  |
Financial assets |  |
Money market funds | 10 | 10
Available-for-sale investment securities, at fair value | 906,295 | 820,648
Stock in Federal Home Loan Bank | 11,218 | 10,678
Loans receivable, net | 4,845,115 | 4,749,525
Mortgage-servicing rights | 11,231 | 11,790
Bank-owned life insurance | 138,732 | 138,139
Derivative assets | 2,295 | 385
Financial liabilities |  |
Deposit liabilities | 5,144,128 | 5,024,500
Short-term borrowings—other than bank | 95,485 | 103,063
Other bank borrowings | 333,743 | 333,392
Long-term debt, net—other than bank | 1,704,567 | 1,669,087
Derivative liabilities | 192 | 30
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial assets |  |
Derivative assets | 1,640 |
Financial liabilities |  |
The Utilities’ short-term borrowings (included in amount above) | 12,998 |
Long-term debt, net—other than bank | 1,397,598 | 1,363,766
Estimated fair value | Level 1 |  |
Financial assets |  |
Derivative assets | 0 | 0
Financial liabilities |  |
Derivative liabilities | 139 | 15
Estimated fair value | Level 2 |  |
Financial assets |  |
Money market funds | 10 | 10
Available-for-sale investment securities, at fair value | 906,295 | 820,648
Stock in Federal Home Loan Bank | 11,218 | 10,678
Loans receivable, net | 7,938 | 4,639
Bank-owned life insurance | 138,732 | 138,139
Derivative assets | 2,295 | 385
Financial liabilities |  |
Deposit liabilities | 5,144,128 | 5,024,500
Short-term borrowings—other than bank | 95,485 | 103,063
Other bank borrowings | 333,743 | 333,392
Long-term debt, net—other than bank | 1,704,567 | 1,669,087
Derivative liabilities | 53 | 15
Estimated fair value | Level 2 | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Financial assets |  |
Derivative assets | 1,640 |
Financial liabilities |  |
The Utilities’ short-term borrowings (included in amount above) | 12,998 |
Long-term debt, net—other than bank | 1,397,598 | 1,363,766
Estimated fair value | Level 3 |  |
Financial assets |  |
Loans receivable, net | 4,837,177 | 4,744,886
Mortgage-servicing rights | $ 11,231 | $ 11,790

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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 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 portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits. + 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/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, after the effects of master netting arrangements, of a financial liability or 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 liabilities 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 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 2: 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 3: 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 4: 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 5: 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 6: 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 + 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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- Definition Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 + Details
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