Segment financial information (Tables)

3 Months Ended

Mar. 31, 2023

Segment Reporting [Abstract]

Schedule of segment financial information

(in thousands)	Electric utility		Bank		Other		Total
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 March 31, 2023)	$	6,674,463	$	9,610,070	$	159,252	$	16,443,785
Three months ended March 31, 2022
Revenues from external customers and other sources	$	708,788	$	75,115	$	1,165	$	785,068
Intersegment revenues (eliminations)	4		—		(4)		—
Revenues	$	708,792	$	75,115	$	1,161	$	785,068
Income (loss) before income taxes	$	59,446	$	30,215	$	(2,181)	$	87,480
Income taxes (benefit)	12,538		6,345		(1,043)		17,840
Net income (loss)	46,908		23,870		(1,138)		69,640
Preferred stock dividends of subsidiaries	499		—		(26)		473
Net income (loss) for common stock	$	46,409	$	23,870	$	(1,112)	$	69,167
Total assets (at December 31, 2022)	$	6,597,467	$	9,545,970	$	140,807	$	16,284,244