Revenues (Tables)

12 Months Ended

Dec. 31, 2020

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, 2020								Year ended December 31, 2019
(in thousands)	Electric  utility		Bank		Other		Total		Electric  utility		Bank		Other		Total
Revenues from contracts with customers
Electric energy sales - residential	$	766,609	$	—	$	—	$	766,609	$	807,652	$	—	$	—	$	807,652
Electric energy sales - commercial	703,516		—		—		703,516		846,110		—		—		846,110
Electric energy sales - large light and power	751,464		—		—		751,464		905,308		—		—		905,308
Electric energy sales - other	8,054		—		—		8,054		16,296		—		—		16,296
Bank fees	—		38,887		—		38,887		—		46,659		—		46,659
Other sales	—		—		921		921		—		—		—		—
Total revenues from contracts with customers	2,229,643		38,887		921		2,269,451		2,575,366		46,659		—		2,622,025
Revenues from other sources
Regulatory revenue	11,869		—		—		11,869		(54,101)		—		—		(54,101)
Bank interest and dividend income	—		244,663		—		244,663		—		266,554		—		266,554
Other bank noninterest income	—		29,961		—		29,961		—		14,704		—		14,704
Other	23,808		—		23		23,831		24,677		—		89		24,766
Total revenues from other sources	35,677		274,624		23		310,324		(29,424)		281,258		89		251,923
Total revenues	$	2,265,320	$	313,511	$	944	$	2,579,775	$	2,545,942	$	327,917	$	89	$	2,873,948
Timing of revenue recognition
Services/goods transferred at a point in time	$	—	$	38,887	$	—	$	38,887	$	—	$	46,659	$	—	$	46,659
Services/goods transferred over time	2,229,643		—		921		2,230,564		2,575,366		—		—		2,575,366
Total revenues from contracts with customers	$	2,229,643	$	38,887	$	921	$	2,269,451	$	2,575,366	$	46,659	$	—	$	2,622,025