Basis of presentation (Tables)

9 Months Ended

Sep. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Impact of Prior Period Financial Statements of the Adoption of ASU 2017-07

The following table summarizes the impact to the prior period financial statements of the adoption of ASU No. 2017-07:

	Three months ended September 30, 2017									Nine months ended September 30, 2017
(in thousands)	As previously filed			Adjustment from adoption of ASU No. 2017-07			As currently reported			As previously filed			Adjustment from adoption of ASU No. 2017-07			As currently reported
HEI Condensed Consolidated Income Statement
Expenses
Electric utility	$	511,693		$	(1,421	)	$	510,272		$	1,483,194		$	(4,279	)	$	1,478,915
Bank	47,525			(212		)	47,313			146,754			(608		)	146,146
Other	4,422			(295		)	4,127			13,777			(823		)	12,954
Total expenses	563,640			(1,928		)	561,712			1,643,725			(5,710		)	1,638,015
Operating income
Electric utility	87,076			1,421			88,497			191,061			4,279			195,340
Bank	26,764			212			26,976			75,720			608			76,328
Other	(4,295		)	295			(4,000		)	(13,478		)	823			(12,655		)
Total operating income	109,545			1,928			111,473			253,303			5,710			259,013
Retirement defined benefits expense--other than service costs	—			(1,928		)	(1,928		)	—			(5,710		)	(5,710		)
Hawaiian Electric Condensed Consolidated Income Statement
Other operation and maintenance	100,102			(1,421		)	98,681			306,716			(4,279		)	302,437
Total expense	511,693			(1,421		)	510,272			1,483,194			(4,279		)	1,478,915
Operating income	87,076			1,421			88,497			191,061			4,279			195,340
Retirement defined benefits expense--other than service costs	—			(1,421		)	(1,421		)	—			(4,279		)	(4,279		)
Hawaiian Electric Condensed Consolidating Income Statement (in Note 3)
Hawaiian Electric (parent only)
Other operation and maintenance	66,221			(1,225		)	64,996			204,460			(3,812		)	200,648
Total expense	367,619			(1,225		)	366,394			1,058,382			(3,812		)	1,054,570
Operating income	61,648			1,225			62,873			128,142			3,812			131,954
Retirement defined benefits expense--other than service costs	—			(1,225		)	(1,225		)	—			(3,812		)	(3,812		)
Hawaii Electric Light
Other operation and maintenance	16,593			15			16,608			49,667			183			49,850
Total expense	71,292			15			71,307			212,692			183			212,875
Operating income	13,042			(15		)	13,027			32,334			(183		)	32,151
Retirement defined benefits expense--other than service costs	—			15			15			—			183			183
Maui Electric
Other operation and maintenance	17,288			(211		)	17,077			52,589			(650		)	51,939
Total expense	72,782			(211		)	72,571			212,120			(650		)	211,470
Operating income	12,416			211			12,627			30,636			650			31,286
Retirement defined benefits expense--other than service costs	—			(211		)	(211		)	—			(650		)	(650		)
ASB Statements of Income Data (in Note 4)
Compensation and employee benefits	23,724			(212		)	23,512			71,703			(608		)	71,095
Other expense	5,050			212			5,262			14,066			608			14,674