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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