Revenues (Tables)

3 Months Ended

Mar. 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:

	Three months ended March 31
	2019								2018
(in thousands)	Electric  utility		Bank		Other		Total		Electric  utility		Bank		Other		Total
Revenues from contracts with customers
Electric energy sales - residential	$	175,745	$	—	$	—	$	175,745	$	178,589	$	—	$	—	$	178,589
Electric energy sales - commercial	187,408		—		—		187,408		188,998		—		—		188,998
Electric energy sales - large light and power	198,926		—		—		198,926		192,321		—		—		192,321
Electric energy sales - other	4,078		—		—		4,078		4,060		—		—		4,060
Bank fees	—		11,233		—		11,233		—		11,497		—		11,497
Total revenues from contracts with customers	566,157		11,233		—		577,390		563,968		11,497		—		575,465
Revenues from other sources
Regulatory revenue	6,207		—		—		6,207		4,750		—		—		4,750
Bank interest and dividend income	—		68,488		—		68,488		—		62,002		—		62,002
Other bank noninterest income	—		3,331		—		3,331		—		1,920		—		1,920
Other	6,131		—		68		6,199		1,709		—		28		1,737
Total revenues from other sources	12,338		71,819		68		84,225		6,459		63,922		28		70,409
Total revenues	$	578,495	$	83,052	$	68	$	661,615	$	570,427	$	75,419	$	28	$	645,874
Timing of revenue recognition
Services/goods transferred at a point in time	$	—	$	11,233	$	—	$	11,233	$	—	$	11,497	$	—	$	11,497
Services/goods transferred over time	566,157		—		—		566,157		563,968		—		—		563,968
Total revenues from contracts with customers	$	566,157	$	11,233	$	—	$	577,390	$	563,968	$	11,497	$	—	$	575,465