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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2017
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)
 
PNM
 
PNMR
 
Unrealized Gains on Available-for-Sale Securities
 
Pension
Liability
Adjustment
 
Total
 
Fair Value Adjustment for Cash Flow Hedges
 
Total
 
(In thousands)
Balance at December 31, 2014
$
28,008

 
$
(89,763
)
 
$
(61,755
)
 
$
—

 
$
(61,755
)
 Amounts reclassified from AOCI (pre-tax)
(28,531
)
 
5,952

 
(22,579
)
 
—

 
(22,579
)
Income tax impact of amounts reclassified
11,181

 
(2,332
)
 
8,849

 
—

 
8,849

 Other OCI changes (pre-tax)
10,998

 
(4,405
)
 
6,593

 
72

 
6,665

Income tax impact of other OCI changes
(4,310
)
 
1,726

 
(2,584
)
 
(28
)
 
(2,612
)
Net after-tax change
(10,662
)
 
941

 
(9,721
)
 
44

 
(9,677
)
Balance at December 31, 2015
17,346

 
(88,822
)
 
(71,476
)
 
44

 
(71,432
)
 Amounts reclassified from AOCI (pre-tax)
(22,139
)
 
5,504

 
(16,635
)
 
764

 
(15,871
)
Income tax impact of amounts reclassified
8,639

 
(2,148
)
 
6,491

 
(298
)
 
6,193

 Other OCI changes (pre-tax)
778

 
(18,501
)
 
(17,723
)
 
(874
)
 
(18,597
)
Income tax impact of other OCI changes
(304
)
 
7,219

 
6,915

 
341

 
7,256

Net after-tax change
(13,026
)
 
(7,926
)
 
(20,952
)
 
(67
)
 
(21,019
)
Balance at December 31, 2016
4,320

 
(96,748
)
 
(92,428
)
 
(23
)
 
(92,451
)
 Amounts reclassified from AOCI (pre-tax)
(17,567
)
 
6,452

 
(11,115
)
 
581

 
(10,534
)
Income tax impact of amounts reclassified
6,816

 
(2,504
)
 
4,312

 
(225
)
 
4,087

 Other OCI changes (pre-tax)
28,160

 
3,618

 
31,778

 
1,000

 
32,778

Income tax impact of other OCI changes
(10,927
)
 
(919
)
 
(11,846
)
 
(388
)
 
(12,234
)
Net after-tax change
6,482

 
6,647

 
13,129

 
968

 
14,097

Reclassification of stranded income taxes to retained earnings Note 11
2,367

 
(20,161
)
 
(17,794
)
 
208

 
(17,586
)
Balance at December 31, 2017
$
13,169

 
$
(110,262
)
 
$
(97,093
)
 
$
1,153

 
$
(95,940
)