Segment financial information (Tables)

6 Months Ended

Jun. 30, 2021

Segment Reporting [Abstract]

Schedule of segment financial information

(in thousands)	Electric utility		Bank		Other		Total
Three months ended June 30, 2021
Revenues from external customers	$	601,869	$	77,260	$	1,128	$	680,257
Intersegment revenues (eliminations)	10		—		(10)		—
Revenues	$	601,879	$	77,260	$	1,118	$	680,257
Income (loss) before income taxes	$	53,898	$	39,992	$	(10,946)	$	82,944
Income taxes (benefit)	11,498		9,708		(2,607)		18,599
Net income (loss)	42,400		30,284		(8,339)		64,345
Preferred stock dividends of subsidiaries	499		—		(26)		473
Net income (loss) for common stock	$	41,901	$	30,284	$	(8,313)	$	63,872
Six months ended June 30, 2021
Revenues from external customers	$	1,166,724	$	154,391	$	2,088	$	1,323,203
Intersegment revenues (eliminations)	19		—		(19)		—
Revenues	$	1,166,743	$	154,391	$	2,069	$	1,323,203
Income (loss) before income taxes	$	108,988	$	77,094	$	(22,942)	$	163,140
Income taxes (benefit)	22,731		17,254		(6,021)		33,964
Net income (loss)	86,257		59,840		(16,921)		129,176
Preferred stock dividends of subsidiaries	998		—		(52)		946
Net income (loss) for common stock	$	85,259	$	59,840	$	(16,869)	$	128,230
Total assets (at June 30, 2021)	$	6,547,974	$	8,909,904	$	148,851	$	15,606,729
Three months ended June 30, 2020
Revenues from external customers	$	534,206	$	74,714	$	25	$	608,945
Intersegment revenues (eliminations)	9		—		(9)		—
Revenues	$	534,215	$	74,714	$	16	$	608,945
Income (loss) before income taxes	$	53,027	$	17,334	$	(10,131)	$	60,230
Income taxes (benefit)	10,199		3,320		(2,649)		10,870
Net income (loss)	42,828		14,014		(7,482)		49,360
Preferred stock dividends of subsidiaries	499		—		(26)		473
Net income (loss) for common stock	$	42,329	$	14,014	$	(7,456)	$	48,887
Six months ended June 30, 2020
Revenues from external customers	$	1,131,636	$	154,452	$	43	$	1,286,131
Intersegment revenues (eliminations)	21		—		(21)		—
Revenues	$	1,131,657	$	154,452	$	22	$	1,286,131
Income (loss) before income taxes	$	82,713	$	36,303	$	(19,090)	$	99,926
Income taxes (benefit)	15,481		6,528		(5,336)		16,673
Net income (loss)	67,232		29,775		(13,754)		83,253
Preferred stock dividends of subsidiaries	998		—		(52)		946
Net income (loss) for common stock	$	66,234	$	29,775	$	(13,702)	$	82,307
Total assets (at December 31, 2020)	$	6,457,373	$	8,396,533	$	150,101	$	15,004,007