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Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net unrealized gains (losses) on available-for-sale investment securities:
Net unrealized gains (losses) on available-for-sale investment securities arising during the period, tax	$ (4,212)	$ 360	$ (14,614)	$ 7,836
Reclassification adjustment for net realized gains included in net income, tax	0	0	(142)	(599)
Derivatives qualifying as cash flow hedges:
Unrealized interest rate hedging arising during the period, tax	48	(51)	347	(739)
Reclassification adjustment for net unrealized losses included in net income, tax	3	0	3	0
Retirement benefit plans:
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, tax	985	2,202	5,155	6,169
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, tax	(971)	(1,985)	(5,002)	(5,563)
Hawaiian Electric Company, Inc. and Subsidiaries
Retirement benefit plans:
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, tax	1,007	2,001	5,062	5,597
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, tax	$ (971)	$ (1,985)	$ (5,002)	$ (5,563)

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Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Amount, before adjustment, of tax expense (benefit) for unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

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