Revenues (Tables)

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

The following tables disaggregate revenues by major source, timing of revenue recognition, and segment:

	Year ended December 31, 2019										Year ended December 31, 2018
(in thousands)	Electric  utility			Bank		Other		Total			Electric  utility			Bank		Other		Total
Revenues from contracts with customers
Electric energy sales - residential	$	807,652		$	—	$	—	$	807,652		$	801,846		$	—	$	—	$	801,846
Electric energy sales - commercial	846,110			—		—		846,110			853,672			—		—		853,672
Electric energy sales - large light and power	905,308			—		—		905,308			894,770			—		—		894,770
Electric energy sales - other	16,296			—		—		16,296			17,243			—		—		17,243
Bank fees	—			46,659		—		46,659			—			47,300		—		47,300
Total revenues from contracts with customers	2,575,366			46,659		—		2,622,025			2,567,531			47,300		—		2,614,831
Revenues from other sources
Regulatory revenue	(54,101		)	—		—		(54,101		)	(37,687		)	—		—		(37,687		)
Bank interest and dividend income	—			266,554		—		266,554			—			258,225		—		258,225
Other bank noninterest income	—			15,357		—		15,357			—			8,750		—		8,750
Other	24,677			—		89		24,766			16,681			—		49		16,730
Total revenues from other sources	(29,424		)	281,911		89		252,576			(21,006		)	266,975		49		246,018
Total revenues	$	2,545,942		$	328,570	$	89	$	2,874,601		$	2,546,525		$	314,275	$	49	$	2,860,849
Timing of revenue recognition
Services/goods transferred at a point in time	$	—		$	46,659	$	—	$	46,659		$	—		$	47,300	$	—	$	47,300
Services/goods transferred over time	2,575,366			—		—		2,575,366			2,567,531			—		—		2,567,531
Total revenues from contracts with customers	$	2,575,366		$	46,659	$	—	$	2,622,025		$	2,567,531		$	47,300	$	—	$	2,614,831