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Credit agreement and long-term debt (Details) (USD $) | 3 Months Ended |  |  | 0 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 Maximum | Mar. 31, 2014 HELCO | Mar. 31, 2014 Maui Electric | Mar. 31, 2014 Line of credit facility | Mar. 31, 2014 Line of credit facility Hawaiian Electric Company | Apr. 02, 2014 Subsequent Event Institution | Apr. 02, 2014 Subsequent Event Line of credit facility | Apr. 02, 2014 Subsequent Event Line of credit facility Hawaiian Electric Company | May 02, 2014 Eurodollar term loan Subsequent Event Loans payable | May 05, 2014 Medium-term Notes 6.51 Percent Due 2014 Subsequent Event Medium-term note | Apr. 02, 2014 Adjusted LIBO Rate Subsequent Event Line of credit facility | Apr. 02, 2014 Adjusted LIBO Rate Subsequent Event Line of credit facility Hawaiian Electric Company
Credit agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of financial institutions |  |  |  |  |  |  |  | 9 |  |  |  |  |  |
Revolving noncollateralized credit facility with a letter of credit sub-facility |  |  |  |  |  | $ 125,000,000 | $ 175,000,000 |  | $ 150,000,000 | $ 200,000,000 |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  | 1.375% | 1.25%
Unused capacity commitment fee |  |  |  |  |  |  |  |  | 0.20% | 0.175% |  |  |  |
Capitalization ratio required to be maintained as per the debt covenant (as a percent) |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Actual capitalization ratio (as a percent) | 18.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Ratio of consolidated subsidiary debt to total consolidated capitalization required to be maintained as per the debt covenant (as a percent) | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Actual ratio of consolidated subsidiary debt to total consolidated capitalization (as a percent) |  |  |  | 42.00% | 45.00% |  |  |  |  |  |  |  |  |
Ratio of consolidated capitalization required to be maintained as per the debt covenant (as a percent) | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Actual ratio of consolidated debt to total consolidated capitalization (as a percent) | 56.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Changes in long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 0 | 50,000,000 |  |  |  |  |  |  |  |  | 125,000,000 |  |  |
Term of loan |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |
Initial interest rate for initial period |  |  |  |  |  |  |  |  |  |  | 1.12% |  |  |
Initial interest period |  |  |  |  |  |  |  |  |  |  | 3 months |  |  |
Repayments of debt |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |
Debt instrument, stated interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 6.51% |  |

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- Definition Represents the consolidated debt to total consolidated capitalization ratio which the entity is required to maintain pursuant to a debt covenant. + References No definition available. + Details
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- Definition The actual consolidated debt to total consolidated capitalization ratio which the entity is required to maintain pursuant to a debt covenant. + References No definition available. + Details
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- Definition Represents the consolidated subsidiary debt to total consolidated capitalization ratio which the entity is required to maintain pursuant to a debt covenant. + References No definition available. + Details
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- Definition The actual consolidated subsidiary debt to total consolidated capitalization ratio which the entity is required to maintain pursuant to a debt covenant. + References No definition available. + Details
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- Definition Represents the nonconsolidated capitalization ratio, which the entity is required to maintain pursuant to a debt covenant. + References No definition available. + Details
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- Definition Represents the actual nonconsolidated capitalization ratio, which the entity is required to maintain pursuant to a debt covenant. + References No definition available. + Details
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- Definition Represents the number of financial institutions with which the entity entered into a revolving Non Collateralized credit agreement with a letter of credit sub-facility. + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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