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Fair value measurements (Details) (USD $) | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Financial liabilities |  |
Short-term borrowings-other than bank | $ 68,821,000 | $ 24,923,000
Other bank borrowings | 233,229,000 | 237,319,000
Carrying or notional amount |  |
Financial assets |  |
Cash and cash equivalents, excluding money market funds | 270,255,000 | 329,553,000
Money market funds | 10,000 | 1,098,000
Available-for-sale investment and mortgage-related securities | 624,331,000 | 678,152,000
Investment in stock of Federal Home Loan Bank of Seattle | 97,764,000 | 97,764,000
Loans receivable, net | 3,652,419,000 | 3,497,729,000
Financial liabilities |  |
Deposit liabilities | 4,070,032,000 | 3,975,372,000
Short-term borrowings-other than bank | 68,821,000 | 24,923,000
Other bank borrowings | 233,229,000 | 237,319,000
Long-term debt, net-other than bank | 1,340,070,000 | 1,364,942,000
Forward starting swaps |  | 2,762,000
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Off-balance sheet items |  |
HECO-obligated preferred securities of trust subsidiary | 50,000,000 | 50,000,000
Carrying or notional amount | American Savings Bank (ASB) |  |
Off-balance sheet items |  |
Loan commitments and unused lines and letters of credit | 1,300,000,000 | 1,200,000,000
Notional amount of loans serviced | 993,300,000 | 817,700,000
Estimated fair value |  |
Financial assets |  |
Cash and cash equivalents, excluding money market funds | 270,255,000 | 329,553,000
Money market funds | 10,000 | 1,098,000
Available-for-sale investment and mortgage-related securities | 624,331,000 | 678,152,000
Investment in stock of Federal Home Loan Bank of Seattle | 97,764,000 | 97,764,000
Loans receivable, net | 3,888,558,000 | 3,639,983,000
Financial liabilities |  |
Deposit liabilities | 3,991,717,000 | 3,979,027,000
Short-term borrowings-other than bank | 68,821,000 | 24,923,000
Other bank borrowings | 250,486,000 | 251,822,000
Long-term debt, net-other than bank | 1,400,241,000 | 1,345,770,000
Forward starting swaps |  | 2,762,000
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Off-balance sheet items |  |
HECO-obligated preferred securities of trust subsidiary | 50,000,000 | 52,500,000
Estimated fair value | American Savings Bank (ASB) |  |
Off-balance sheet items |  |
Loan commitments and unused lines and letters of credit | 300,000 | 400,000
Servicing rights on loans | $ 9,800,000 | $ 8,800,000

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity 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. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + 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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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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