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Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net income for common stock $ 63,415 $ 65,032 $ 191,645 $ 147,339
Net unrealized gains (losses) on available-for-sale investment securities:        
Net unrealized gains (losses) on available-for-sale investment securities arising during the period, net of taxes of $(4,212), $360, $(14,614) and $7,836, respectively (11,507) 984 (39,921) 21,405
Reclassification adjustment for net realized gains included in net income, net of taxes of nil, nil, $(142) and $(599), respectively 0 0 (387) (1,638)
Derivatives qualifying as cash flow hedges:        
Unrealized interest rate hedging gains (losses) arising during the period, net of taxes of $48, $(51), $347 and $(739), respectively 139 (147) 1,000 (2,129)
Reclassification adjustment for net realized losses included in net income, net of taxes of $3, nil, $3 and nil, respectively 9 0 9 0
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 2,853 6,324 14,871 17,720
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (2,799) (5,721) (14,421) (16,038)
Other comprehensive income (loss), net of taxes (11,305) 1,440 (38,849) 19,320
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 52,110 66,472 152,796 166,659
Hawaiian Electric Company, Inc. and Subsidiaries        
Net income for common stock 50,342 60,065 135,601 126,299
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 2,905 5,769 14,596 16,137
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (2,799) (5,721) (14,421) (16,038)
Other comprehensive income (loss), net of taxes 106 48 175 99
Comprehensive income attributable to Hawaiian Electric Industries, Inc. $ 50,448 $ 60,113 $ 135,776 $ 126,398