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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 1,674,740	$ 1,788,315	$ 1,752,594	$ 1,761,448
Balance, as adjusted					$ 1,761,448
Total Other Comprehensive Income	1,301	2,277	9,803	5,668
Ending balance	1,735,088	1,836,522	1,735,088	1,836,522
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(100,182)	(103,757)	(108,684)	(95,940)
Cumulative effect adjustment					(11,208)
Balance, as adjusted					(107,148)
Amounts reclassified from AOCI (pre-tax)			(6,303)	2,297
Income tax impact of amounts reclassified			1,602	(584)
Other OCI changes (pre-tax)			19,442	5,303
Income tax impact of other OCI changes			(4,938)	(1,348)
Total Other Comprehensive Income	1,301	2,277	9,803	5,668
Ending balance	(98,881)	(101,480)	(98,881)	(101,480)
Fair Value Adjustment for Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			1,738	1,153
Balance, as adjusted					1,153
Amounts reclassified from AOCI (pre-tax)			707	102
Income tax impact of amounts reclassified			(179)	(27)
Other OCI changes (pre-tax)			(3,664)	2,431
Income tax impact of other OCI changes			931	(618)
Total Other Comprehensive Income			(2,205)	1,888
Ending balance	(467)	3,041	(467)	3,041
PNM
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	1,402,493	1,523,612	1,461,571	1,488,369
Balance, as adjusted					1,488,369
Total Other Comprehensive Income	1,534	2,188	12,008	3,780
Ending balance	1,486,339	1,602,800	1,486,339	1,602,800
PNM | Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(99,948)	(106,709)	(110,422)	(97,093)
Cumulative effect adjustment					(11,208)
Balance, as adjusted					(108,301)
Amounts reclassified from AOCI (pre-tax)			(7,010)	2,195
Income tax impact of amounts reclassified			1,781	(557)
Other OCI changes (pre-tax)			23,106	2,872
Income tax impact of other OCI changes			(5,869)	(730)
Total Other Comprehensive Income	1,534	2,188	12,008	3,780
Ending balance	(98,414)	(104,521)	(98,414)	(104,521)
PNM | Unrealized Gains on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			1,939	13,169
Cumulative effect adjustment					(11,208)
Balance, as adjusted					1,961
Amounts reclassified from AOCI (pre-tax)			(12,563)	(3,483)
Income tax impact of amounts reclassified			3,191	885
Other OCI changes (pre-tax)			23,106	2,872
Income tax impact of other OCI changes			(5,869)	(730)
Total Other Comprehensive Income			7,865	(456)
Ending balance	9,804	1,505	9,804	1,505
PNM | Pension Liability Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(112,361)	(110,262)
Balance, as adjusted					$ (110,262)
Amounts reclassified from AOCI (pre-tax)			5,553	5,678
Income tax impact of amounts reclassified			(1,410)	(1,442)
Total Other Comprehensive Income			4,143	4,236
Ending balance	$ (108,218)	$ (106,026)	$ (108,218)	$ (106,026)

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