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Income taxes (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Federal |  |  |
Current | $ (1,520,000) | $ (15,411,000) | $ (7,639,000)
Deferred | 73,680,000 | 82,138,000 | 73,495,000
Deferred tax credits, net | 224,000 | 187,000 | 0
Federal taxes | 72,384,000 | 66,914,000 | 65,856,000
State |  |  |
Current | (1,555,000) | (4,654,000) | 2,437,000
Deferred | 6,719,000 | 8,710,000 | 5,949,000
Deferred tax credits, net | 6,793,000 | 5,889,000 | 1,690,000
State taxes | 11,957,000 | 9,945,000 | 10,076,000
Federal and state taxes | 84,341,000 | 76,859,000 | 75,932,000
Reconciliation percentage of amount of income taxes computed at federal statutory rate | 35.00% | 35.00% | 35.00%
Increase (decrease) resulting from: |  |  |
Amount at the federal statutory income tax rate | 86,711,000 | 76,092,000 | 75,618,000
State income taxes, net of effect on federal income taxes | 7,772,000 | 6,464,000 | 6,550,000
Other, net | (10,142,000) | (5,697,000) | (6,236,000)
Federal and state taxes | 84,341,000 | 76,859,000 | 75,932,000
Effective income tax rate (as a percent) | 34.00% | 35.40% | 35.10%
Amount of decrease in deferred taxes related to tax gross-up of AFUDC-equity | 3,500,000 |  |
Out-of-period income tax benefit | 3,100,000 |  |
Out-of-period tax benefit related to utilities | 2,700,000 |  |
Deferred tax assets |  |  |
Allowance for loan losses | 16,172,000 | 17,254,000 |
Retirement benefits | 0 | 266,000 |
Net operating loss | 0 | 0 |
Other | 41,067,000 | 34,354,000 |
Total deferred tax assets | 57,239,000 | 51,874,000 |
Deferred tax liabilities |  |  |
Property, plant and equipment | 378,280,000 | 316,900,000 |
Goodwill | 23,781,000 | 23,781,000 |
Regulatory assets, excluding amounts attributable to property, plant and equipment | 33,251,000 | 33,071,000 |
FHLB stock dividend | 18,847,000 | 20,062,000 |
Repairs deduction | 75,127,000 | 69,514,000 |
Retirement benefits | 29,280,000 | 0 |
Other | 27,933,000 | 27,875,000 |
Deferred Tax Liabilities, Gross | 586,499,000 | 491,203,000 |
Total deferred tax liabilities | 529,260,000 | 439,329,000 |
Credit adjustments to interest expense on income taxes | 300,000 | 1,400,000 | 1,200,000
Amount of accrued interest related to uncertain tax positions | 400,000 | 300,000 |
Changes in total unrecognized tax benefits |  |  |
Unrecognized tax benefits, at the beginning of the period | 800,000 | 5,700,000 | 15,400,000
Additions based on tax positions taken during the year | 0 | 300,000 | 0
Reductions based on tax positions taken during the year | 0 | 0 | (600,000)
Additions for tax positions of prior years | 500,000 | 0 | 100,000
Reductions for tax positions of prior years | (400,000) | (4,100,000) | (8,100,000)
Settlements | 0 | 0 | 0
Lapses of statute of limitations | 0 | (1,100,000) | (1,100,000)
Unrecognized tax benefits, at the end of the period | 900,000 | 800,000 | 5,700,000
Unrecognized tax benefits that would affect effect tax rate | 700,000 |  |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Federal |  |  |
Current | 1,313,000 | (26,965,000) | (10,820,000)
Deferred | 58,024,000 | 79,437,000 | 64,646,000
Deferred tax credits, net | 224,000 | 186,000 | 0
Federal taxes | 59,561,000 | 52,658,000 | 53,826,000
State |  |  |
Current | (3,720,000) | (4,940,000) | 1,226,000
Deferred | 6,483,000 | 7,441,000 | 4,445,000
Deferred tax credits, net | 6,793,000 | 5,889,000 | 2,087,000
State taxes | 9,556,000 | 8,390,000 | 7,758,000
Federal and state taxes | 69,117,000 | 61,048,000 | 61,584,000
Increase (decrease) resulting from: |  |  |
Amount at the federal statutory income tax rate | 67,914,000 | 56,812,000 | 57,248,000
State income taxes, net of effect on federal income taxes | 6,211,000 | 5,453,000 | 5,042,000
Other, net | (5,008,000) | (1,217,000) | (706,000)
Federal and state taxes | 69,117,000 | 61,048,000 | 61,584,000
Effective income tax rate (as a percent) | 35.60% | 37.60% | 37.70%
Deferred tax assets |  |  |
Allowance for loan losses | 0 | 0 |
Retirement benefits | 0 | 0 |
Net operating loss | 19,848,000 | 6,413,000 |
Other | 17,295,000 | 13,986,000 |
Total deferred tax assets | 37,143,000 | 20,399,000 |
Deferred tax liabilities |  |  |
Property, plant and equipment | 375,771,000 | 315,409,000 |
Goodwill | 0 | 0 |
Regulatory assets, excluding amounts attributable to property, plant and equipment | 33,251,000 | 33,071,000 |
FHLB stock dividend | 0 | 0 |
Repairs deduction | 75,127,000 | 69,514,000 |
Retirement benefits | 23,851,000 | 8,688,000 |
Other | 15,602,000 | 11,328,000 |
Deferred Tax Liabilities, Gross | 523,602,000 | 438,010,000 |
Total deferred tax liabilities | 486,459,000 | 417,611,000 |
Net operating loss carryforwards | 55,000,000 |  |
Credit adjustments to interest expense on income taxes | 300,000 | 500,000 | 1,000,000
Changes in total unrecognized tax benefits |  |  |
Unrecognized tax benefits, at the beginning of the period | 400,000 | 3,700,000 | 14,200,000
Additions based on tax positions taken during the year | 0 | 300,000 | 0
Reductions based on tax positions taken during the year | 0 | 0 | (600,000)
Additions for tax positions of prior years | 500,000 | 0 | 0
Reductions for tax positions of prior years | (400,000) | (3,600,000) | (8,800,000)
Settlements | 0 | 0 | 0
Lapses of statute of limitations | 0 | 0 | (1,100,000)
Unrecognized tax benefits, at the end of the period | 500,000 | 400,000 | 3,700,000
Unrecognized tax benefits that would affect effect tax rate | 500,000 |  |
Prepayments and other |  |  |
Deferred tax liabilities |  |  |
Total deferred tax liabilities | 0 | 0 |
Prepayments and other | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Deferred tax liabilities |  |  |
Total deferred tax liabilities | 20,702,000 | 0 |
Deferred income taxes, liabilities, noncurrent |  |  |
Deferred tax liabilities |  |  |
Total deferred tax liabilities | 529,260,000 | 439,329,000 |
Deferred income taxes, liabilities, noncurrent | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Deferred tax liabilities |  |  |
Total deferred tax liabilities | $ 507,161,000 | $ 417,611,000 |

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- Definition The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(1) -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. + Details
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- Definition The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(3) -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. + Details
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- Definition The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(2) -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. + Details
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- Definition The gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(1) -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. + Details
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- Definition This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph c -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 15 -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. + Details
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- Definition This element represents interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph c -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 15 -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. + Details
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- Definition The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(4) -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. + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -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. + Details
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