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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

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