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Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net income for common stock $ 64,358 $ 33,420
Net unrealized gains on available-for-sale investment securities:    
Net unrealized gains on available-for-sale investment securities arising during the period, net of taxes of $(16,616) and $7,120, respectively (45,390) 19,448
Reclassification adjustment for net realized gains included in net income, net of taxes of $(142) and nil, respectively (387) 0
Derivatives qualifying as cash flow hedges:    
Unrealized interest rate hedging losses arising during the period, net of taxes of $542 and $(619), respectively 1,562 (1,784)
Retirement benefit plans:    
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of taxes 6,010 5,706
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (5,811) (5,158)
Other comprehensive income (loss), net of taxes (44,016) 18,212
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 20,342 51,632
Hawaiian Electric Company, Inc. and Subsidiaries    
Net income for common stock 43,358 23,905
Retirement benefit plans:    
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of taxes 5,845 5,184
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (5,811) (5,158)
Other comprehensive income (loss), net of taxes 34 26
Comprehensive income attributable to Hawaiian Electric Industries, Inc. $ 43,392 $ 23,931