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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning balance $ 1,747,458 $ 1,749,014 $ 1,752,594 $ 1,761,448  
Balance, as adjusted         $ 1,761,448
Amounts reclassified from AOCI (pre-tax)     (1,374) 655  
Income tax impact of amounts reclassified     350 (167)  
Other OCI changes (pre-tax)     12,769 3,892  
Income tax impact of other OCI changes     (3,243) (989)  
Total Other Comprehensive Income 3,057 1,763 8,502 3,391  
Ending balance 1,674,740 1,788,315 1,674,740 1,788,315  
Total          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning balance (103,239) (105,520) (108,684) (95,940)  
Cumulative effect adjustment (Note 7)         (11,208)
Balance, as adjusted         (107,148)
Total Other Comprehensive Income 3,057 1,763 8,502 3,391  
Ending balance (100,182) (103,757) (100,182) (103,757)  
Fair Value Adjustment for Cash Flow Hedges          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning balance     1,738    
Amounts reclassified from AOCI (pre-tax)     525    
Income tax impact of amounts reclassified     (133)    
Other OCI changes (pre-tax)     (3,169)    
Income tax impact of other OCI changes     805    
Total Other Comprehensive Income     (1,972)    
Ending balance (234)   (234)    
Fair Value Adjustment for Cash Flow Hedges          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning balance       1,153  
Balance, as adjusted         1,153
Amounts reclassified from AOCI (pre-tax)       (7)  
Income tax impact of amounts reclassified       1  
Other OCI changes (pre-tax)       2,420  
Income tax impact of other OCI changes       (615)  
Total Other Comprehensive Income       1,799  
Ending balance   2,952   2,952  
PNM          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning balance 1,485,307 1,495,561 1,461,571 1,488,369  
Balance, as adjusted         1,488,369
Amounts reclassified from AOCI (pre-tax)     (1,899) 662  
Income tax impact of amounts reclassified     483 (168)  
Other OCI changes (pre-tax)     15,938 1,472  
Income tax impact of other OCI changes     (4,048) (374)  
Total Other Comprehensive Income 4,317 1,310 10,474 1,592  
Ending balance 1,402,493 1,523,612 1,402,493 1,523,612  
PNM | Total          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning balance (104,265) (108,019) (110,422) (97,093)  
Cumulative effect adjustment (Note 7)         (11,208)
Balance, as adjusted         (108,301)
Total Other Comprehensive Income 4,317 1,310 10,474 1,592  
Ending balance (99,948) (106,709) (99,948) (106,709)  
PNM | Unrealized Gains on Available-for-Sale Securities          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning balance     1,939 13,169  
Cumulative effect adjustment (Note 7)         (11,208)
Balance, as adjusted         1,961
Amounts reclassified from AOCI (pre-tax)     (5,601) (3,126)  
Income tax impact of amounts reclassified     1,423 794  
Other OCI changes (pre-tax)     15,938 1,472  
Income tax impact of other OCI changes     (4,048) (374)  
Total Other Comprehensive Income     7,712 (1,234)  
Ending balance 9,651 727 9,651 727  
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)     3,702 3,788  
Income tax impact of amounts reclassified     (940) (962)  
Total Other Comprehensive Income     2,762 2,826  
Ending balance $ (109,599) $ (107,436) $ (109,599) $ (107,436)