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Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Statement of Comprehensive Income [Abstract]    
Net income for common stock $ 26,671 $ 42,122
Net unrealized gains (losses) on available-for-sale investment securities:    
Net unrealized losses on available-for-sale investment securities arising during the period, net of taxes of nil and $(4,975), respectively 0 (13,589)
Amortization of unrealized holding losses on held-to-maturity securities, net of taxes of nil and $1,129, respectively 0 3,086
Derivatives qualifying as cash flow hedges:    
Unrealized interest rate hedging gains (losses) arising during the period, net of taxes of $(135) and $256, respectively (388) 740
Reclassification adjustment to net income, net of taxes of $(17) and $(16), respectively (50) (48)
Retirement benefit plans:    
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes of $(176) and $(154), respectively (505) (449)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $168 and $159, respectively 483 459
Other comprehensive loss, net of tax benefits (460) (9,801)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. $ 26,211 $ 32,321