Segment financial information (Tables)

3 Months Ended

Mar. 31, 2024

Segment Reporting [Abstract]

Schedule of Segment Financial Information

(in thousands)	Electric utility		Bank		Other		Total
Three months ended March 31, 2024
Revenues	$	788,578	$	105,144	$	3,436	$	897,158
Income (loss) before income taxes	$	50,900	$	25,813	$	(22,444)	$	54,269
Income taxes (benefit)	11,180		4,879		(4,385)		11,674
Net income (loss)	39,720		20,934		(18,059)		42,595
Preferred stock dividends of subsidiaries	499		—		(26)		473
Net income (loss) for common stock	$	39,221	$	20,934	$	(18,033)	$	42,122
Total assets (at March 31, 2024)	$	7,274,862	$	9,360,229	$	288,117	$	16,923,208
Three months ended March 31, 2023
Revenues	$	830,361	$	93,857	$	4,019	$	928,237
Income (loss) before income taxes	$	61,108	$	23,707	$	(14,511)	$	70,304
Income taxes (benefit)	13,600		5,145		(3,635)		15,110
Net income (loss)	47,508		18,562		(10,876)		55,194
Preferred stock dividends of subsidiaries	499		—		(26)		473
Net income (loss) for common stock	$	47,009	$	18,562	$	(10,850)	$	54,721
Total assets (at December 31, 2023)	$	7,283,554	$	9,673,192	$	287,075	$	17,243,821