Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net unrealized gains (losses) on securities arising during the period, (taxes) benefits	$ (5,182)	$ 1,592	$ (8,637)	$ 6,459
Unrealized interest rate hedging losses arising during period, tax benefits	(380)	0	(520)	0
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, tax benefits	871	1,862	1,741	3,654
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, tax expense	797	1,674	1,594	3,277
Hawaiian Electric Company, Inc. and Subsidiaries
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, tax benefits	805	1,683	1,610	3,297
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, tax expense	$ 797	$ 1,674	$ 1,594	$ 3,277