Shareholders' equity (Tables)

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Schedule of accumulated other comprehensive income

Changes in the balances of each component of AOCI were as follows:

	HEI Consolidated								Hawaiian Electric Consolidated
(in thousands)	Net unrealized gains (losses) on securities		Unrealized gains (losses) on derivatives		Retirement benefit plans		AOCI		AOCI-Retirement benefit plans
Balance, December 31, 2017	$	(14,951)	$	—	$	(26,990)	$	(41,941)	$	(1,219)
Current period other comprehensive income (loss) and reclassifications, net of taxes	(9,472)		(436)		1,239		(8,669)		1,318
Balance, December 31, 2018	(24,423)		(436)		(25,751)		(50,610)		99
Current period other comprehensive income (loss) and reclassifications, net of taxes	26,904		(1,177)		4,844		30,571		(1,378)
Balance, December 31, 2019	2,481		(1,613)		(20,907)		(20,039)		(1,279)
Current period other comprehensive income (loss) and reclassifications, net of taxes	17,505		(1,750)		3,020		18,775		(1,640)
Balance, December 31, 2020	$	19,986	$	(3,363)	$	(17,887)	$	(1,264)	$	(2,919)

Schedule of reclassifications out of AOCI

Reclassifications out of AOCI were as follows:

	Amount reclassified from AOCI						Affected line item in the Statement of Income/Balance Sheet
Years ended December 31	2020		2019		2018
(in thousands)
HEI consolidated
Net realized gains on securities included in net income	$	(1,638)	$	(478)	$	—	Gain on sale of investment securities, net
Retirement benefit plans:
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost	23,689		10,107		21,015		See Note 10 for additional details
Impact of D&Os of the PUC included in regulatory assets	39,860		(16,177)		8,325		See Note 10 for additional details
Total reclassifications	$	61,911	$	(6,548)	$	29,340
Hawaiian Electric consolidated
Retirement benefit plans:
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost	$	21,550	$	9,550	$	19,012	See Note 10 for additional details
Impact of D&Os of the PUC included in regulatory assets	39,860		(16,177)		8,325		See Note 10 for additional details
Total reclassifications	$	61,410	$	(6,627)	$	27,337