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Electric utility segment - Consolidating statement of changes in common stock equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Beginning Balance     $ 1,927,640 $ 1,790,573
Net income for common stock $ 44,128 $ 35,018 76,480 66,884
Current period other comprehensive income 2,108 (3,127) 10,908 931
Common stock dividends     (66,848) (65,140)
Ending Balance 1,966,182 1,898,520 1,966,182 1,898,520
Hawaiian Electric Company        
Beginning Balance     1,728,325 1,682,144
Net income for common stock 35,857 32,841 61,224 59,715
Current period other comprehensive income (755) (15) 261 7
Common stock dividends     (46,800) (45,203)
Common stock issuance expenses     (4) (5)
Ending Balance 1,743,006 1,696,658 1,743,006 1,696,658
HELCO        
Beginning Balance     292,702 281,846
Net income for common stock 5,220 4,484 9,182 8,272
Current period other comprehensive income (1) (3) (1) (3)
Common stock dividends     (6,604) (5,010)
Common stock issuance expenses     (4) (1)
Ending Balance 295,275 285,104 295,275 285,104
Maui Electric        
Beginning Balance     263,725 256,692
Net income for common stock 5,663 5,140 9,630 9,044
Current period other comprehensive income (2) (3) (2) (3)
Common stock dividends     (6,530) (7,587)
Common stock issuance expenses     0 0
Ending Balance 266,823 258,146 266,823 258,146
Other subsidiaries        
Beginning Balance     101 101
Net income for common stock 0 0 0 0
Current period other comprehensive income 0 0 0 0
Ending Balance 101 101 101 101
Consolidating adjustments        
Beginning Balance     (556,528) (538,639)
Net income for common stock (10,883) (9,624) (18,812) (17,316)
Current period other comprehensive income 3 6 3 6
Common stock dividends     13,134 12,597
Common stock issuance expenses     4 1
Ending Balance (562,199) (543,351) (562,199) (543,351)
Hawaiian Electric Company, Inc. and Subsidiaries        
Beginning Balance     1,728,325 1,682,144
Net income for common stock 35,857 32,841 61,224 59,715
Current period other comprehensive income (755) (15) 261 7
Common stock dividends     (46,800) (45,203)
Common stock issuance expenses     (4) (5)
Ending Balance $ 1,743,006 $ 1,696,658 $ 1,743,006 $ 1,696,658