Segment financial information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Segment financial information
Revenues	$ 928,237	$ 785,068
Income (loss) before income taxes	70,304	87,480
Income taxes (benefit)	15,110	17,840
Net income attributable to Hawaiian Electric	55,194	69,640
Preferred stock dividends of Hawaiian Electric	473	473
Net income for common stock	54,721	69,167
Total assets	16,443,785		$ 16,284,244
Revenues from external customers
Segment financial information
Revenues		785,068
Intersegment revenues (eliminations)
Segment financial information
Revenues		0
Electric utility
Segment financial information
Revenues	830,361	708,792
Income (loss) before income taxes	61,108	59,446
Income taxes (benefit)	13,600	12,538
Net income attributable to Hawaiian Electric	47,508	46,908
Preferred stock dividends of Hawaiian Electric	499	499
Net income for common stock	47,009	46,409
Total assets	6,674,463		6,597,467
Electric utility | Revenues from external customers
Segment financial information
Revenues		708,788
Electric utility | Intersegment revenues (eliminations)
Segment financial information
Revenues		4
Bank
Segment financial information
Revenues	93,857	75,115
Income (loss) before income taxes	23,707	30,215
Income taxes (benefit)	5,145	6,345
Net income attributable to Hawaiian Electric	18,562	23,870
Preferred stock dividends of Hawaiian Electric	0	0
Net income for common stock	18,562	23,870
Total assets	9,610,070		9,545,970
Bank | Revenues from external customers
Segment financial information
Revenues		75,115
Bank | Intersegment revenues (eliminations)
Segment financial information
Revenues		0
Other
Segment financial information
Revenues	4,019	1,161
Income (loss) before income taxes	(14,511)	(2,181)
Income taxes (benefit)	(3,635)	(1,043)
Net income attributable to Hawaiian Electric	(10,876)	(1,138)
Preferred stock dividends of Hawaiian Electric	(26)	(26)
Net income for common stock	(10,850)	(1,112)
Total assets	$ 159,252		$ 140,807
Other | Revenues from external customers
Segment financial information
Revenues		1,165
Other | Intersegment revenues (eliminations)
Segment financial information
Revenues		$ (4)