Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues
Total revenues	$ 3,682,166	$ 3,741,985	$ 2,850,379
Expenses
Total expenses	3,329,562	3,360,912	2,464,313
Operating income (loss)
Operating income	352,604	381,073	386,066
Retirement defined benefits credit—other than service costs	4,768	4,411	5,848
Interest expense, net – other than on deposit liabilities and other bank borrowings	(125,532)	(103,402)	(94,363)
Allowance for borrowed funds used during construction	5,201	3,416	3,250
Allowance for equity funds used during construction	15,164	10,574	9,534
Interest income	9,105	0	0
Gain (loss) on sales of investment securities, net and equity-method investment	(15,609)	8,123	528
Income before income taxes	245,701	304,195	310,863
Income taxes	44,573	61,167	62,807
Net income	201,128	243,028	248,056
Preferred stock dividends of Hawaiian Electric	1,890	1,890	1,890
Net income for common stock	$ 199,238	$ 241,138	$ 246,166
Basic earnings per common share (in dollars per share)	$ 1.82	$ 2.20	$ 2.25
Diluted earnings per common share (in dollars per share)	$ 1.81	$ 2.20	$ 2.25
Weighted-average number of common shares outstanding (in shares)	109,739	109,434	109,282
Net effect of potentially dilutive shares (share-based compensation programs) (in shares)	299	344	298
Weighted-average shares assuming dilution (in shares)	110,038	109,778	109,580
Electric utility
Revenues
Total revenues	$ 3,269,521	$ 3,408,587	$ 2,539,636
Expenses
Total expenses	2,967,363	3,109,396	2,260,078
Operating income (loss)
Operating income	302,158	299,191	279,558
Interest income	6,454
Income before income taxes	247,140	240,600	223,785
Income taxes	51,193	49,676	44,148
Net income	195,947	190,924	179,637
Preferred stock dividends of Hawaiian Electric	1,995	1,995	1,995
Net income for common stock	193,952	188,929	177,642
Bank
Revenues
Total revenues	394,663	321,068	306,398
Expenses
Total expenses	317,051	219,550	178,195
Operating income (loss)
Operating income	77,612	101,518	128,203
Interest income	0
Income before income taxes	63,401	102,241	130,559
Income taxes	10,039	22,252	29,325
Net income	53,362	79,989	101,234
Preferred stock dividends of Hawaiian Electric	0	0	0
Net income for common stock	53,362	79,989	101,234
Other
Revenues
Total revenues	17,982	12,330	4,345
Expenses
Total expenses	45,148	31,966	26,040
Operating income (loss)
Operating income	(27,166)	(19,636)	(21,695)
Interest income	2,651
Income before income taxes	(64,840)	(38,646)	(43,481)
Income taxes	(16,659)	(10,761)	(10,666)
Net income	(48,181)	(27,885)	(32,815)
Preferred stock dividends of Hawaiian Electric	(105)	(105)	(105)
Net income for common stock	$ (48,076)	$ (27,780)	$ (32,710)