Segment financial information (Tables)

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Schedule of segment financial information

(in thousands)	Electric utility		Bank		Other			Total
Three months ended March 31, 2019
Revenues from external customers	$	578,482	$	83,052	$	81		$	661,615
Intersegment revenues (eliminations)	13		—		(13		)	—
Revenues	$	578,495	$	83,052	$	68		$	661,615
Income (loss) before income taxes	$	41,859	$	26,162	$	(9,982	)	$	58,039
Income taxes (benefit)	9,234		5,323		(2,679		)	11,878
Net income (loss)	32,625		20,839		(7,303		)	46,161
Preferred stock dividends of subsidiaries	499		—		(26		)	473
Net income (loss) for common stock	$	32,126	$	20,839	$	(7,277	)	$	45,688
Total assets (at March 31, 2019)	$	6,170,888	$	7,062,367	$	126,850		$	13,360,105
Three months ended March 31, 2018
Revenues from external customers	$	570,414	$	75,419	$	41		$	645,874
Intersegment revenues (eliminations)	13		—		(13		)	—
Revenues	$	570,427	$	75,419	$	28		$	645,874
Income (loss) before income taxes	$	37,149	$	24,500	$	(8,373	)	$	53,276
Income taxes (benefit)	9,175		5,540		(2,159		)	12,556
Net income (loss)	27,974		18,960		(6,214		)	40,720
Preferred stock dividends of subsidiaries	499		—		(26		)	473
Net income (loss) for common stock	$	27,475	$	18,960	$	(6,188	)	$	40,247
Total assets (at December 31, 2018)	$	5,967,503	$	7,027,894	$	108,654		$	13,104,051