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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) Information regarding AOCI is as follows:
Accumulated Other Comprehensive Income (Loss)
PNMPNMR
Unrealized Gains on Available-for-Sale SecuritiesPension
Liability
Adjustment		TotalFair Value Adjustment for Cash Flow HedgesTotal
 (In thousands)
Balance at December 31, 2017, as originally reported
$13,169 $(110,262)$(97,093)$1,153 $(95,940)
Cumulative effect adjustment (Note 9)(11,208)— (11,208)— (11,208)
Balance at January 1, 2018, as adjusted
1,961 (110,262)(108,301)1,153 (107,148)
 Amounts reclassified from AOCI (pre-tax)
(3,819)7,568 3,749 216 3,965 
Income tax impact of amounts reclassified
970 (1,922)(952)(56)(1,008)
 Other OCI changes (pre-tax)
3,790 (10,382)(6,592)570 (6,022)
Income tax impact of other OCI changes
(963)2,637 1,674 (145)1,529 
Net after-tax change
(22)(2,099)(2,121)585 (1,536)
Balance at December 31, 20181,939 (112,361)(110,422)1,738 (108,684)
 Amounts reclassified from AOCI (pre-tax)
(14,063)7,404 (6,659)733 (5,926)
Income tax impact of amounts reclassified
3,572 (1,880)1,692 (186)1,506 
 Other OCI changes (pre-tax)
25,724 (3,829)21,895 (3,495)18,400 
Income tax impact of other OCI changes
(6,534)973 (5,561)888 (4,673)
Net after-tax change
8,699 2,668 11,367 (2,060)9,307 
Balance at December 31, 201910,638 (109,693)(99,055)(322)(99,377)
 Amounts reclassified from AOCI (pre-tax)
(9,497)8,300 (1,197)(1,740)(2,937)
Income tax impact of amounts reclassified
2,412 (2,108)304 442 746 
 Other OCI changes (pre-tax)
22,586 6,149 28,735 1,271 30,006 
Income tax impact of other OCI changes
(5,736)(1,562)(7,298)(323)(7,621)
Net after-tax change
9,765 10,779 20,544 (350)20,194 
Balance at December 31, 2020$20,403 $(98,914)$(78,511)$(672)$(79,183)