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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Rollforward of AOCI Information regarding AOCI is as follows:
Accumulated Other Comprehensive Income (Loss)
PNM
TXNM
Unrealized Gains on Available-for-Sale SecuritiesPension
Liability
Adjustment		TotalFair Value Adjustment for Cash Flow HedgesTotal
 (In thousands)
Balance at December 31, 2021
$11,715 $(83,651)$(71,936)$— $(71,936)
 Amounts reclassified from AOCI (pre-tax)(3,827)7,104 3,277 (1,176)2,101 
Income tax impact of amounts reclassified972 (1,804)(832)299 (533)
 Other OCI changes (pre-tax)(1,928)(4,565)(6,493)12,285 5,792 
Income tax impact of other OCI changes490 1,159 1,649 (3,121)(1,472)
Net after-tax change(4,293)1,894 (2,399)8,287 5,888 
Balance at December 31, 2022
7,422 (81,757)(74,335)8,287 (66,048)
 Amounts reclassified from AOCI (pre-tax)(7,199)4,776 (2,423)9,287 6,864 
Income tax impact of amounts reclassified1,828 (1,212)616 (2,359)(1,743)
 Other OCI changes (pre-tax)11,529 1,389 12,918 (15,483)(2,565)
Income tax impact of other OCI changes(2,928)(353)(3,281)3,933 652 
Net after-tax change3,230 4,600 7,830 (4,622)3,208 
Balance at December 31, 202310,652 (77,157)(66,505)3,665 (62,840)
 Amounts reclassified from AOCI (pre-tax)(13,108)4,866 (8,242)10,348 2,106 
Income tax impact of amounts reclassified3,330 (1,236)2,094 (2,629)(535)
 Other OCI changes (pre-tax)(885)(3,210)(4,095)(15,260)(19,355)
Income tax impact of other OCI changes225 815 1,040 3,876 4,916 
Net after-tax change(10,438)1,235 (9,203)(3,665)(12,868)
Balance at December 31, 2024$214 $(75,922)$(75,708)$— $(75,708)