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Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Net income for common stock $ 46,054 $ 38,661 $ 86,301 $ 72,854
Net unrealized gains (losses) on available-for-sale investment securities:        
Net unrealized gain (losses) on available-for-sale investment securities arising during the period, net of taxes (4,348) 2,021 (17,645) 2,244
Derivatives qualifying as cash flow hedges:        
Reclassification adjustment to net income, net of tax benefits 0 0 0 454
Retirement benefit plans:        
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits 5,350 3,930 10,496 7,851
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (4,827) (3,581) (9,449) (7,194)
Other comprehensive income (loss), net of taxes (3,825) 2,370 (16,598) 3,355
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 42,229 41,031 69,703 76,209
Hawaiian Electric Company, Inc. and Subsidiaries        
Net income for common stock 31,169 25,644 58,644 47,109
Derivatives qualifying as cash flow hedges:        
Reclassification adjustment to net income, net of tax benefits 0 0 0 454
Retirement benefit plans:        
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits 4,853 3,621 9,506 7,239
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (4,827) (3,581) (9,449) (7,194)
Other comprehensive income (loss), net of taxes 26 40 57 499
Comprehensive income attributable to Hawaiian Electric Industries, Inc. $ 31,195 $ 25,684 $ 58,701 $ 47,608