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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
AOCI reports a measure for accumulated changes in equity that result from transactions and other economic events other than transactions with shareholders. Information regarding AOCI is as follows:
 
Accumulated Other Comprehensive Income (Loss)
 
Unrealized Gain on Available-for-Sale Securities
 
Pension
Liability
Adjustment
 
Fair Value Adjustment for Cash Flow Hedges
 
Total
 
 
 
(In thousands)
 
 
  PNMR
 
 
 
 
 
 
 
Balance at December 31, 2010
$
16,211

 
$
(83,254
)
 
$
(1,623
)
 
$
(68,666
)
 Amounts reclassified from AOCI (pre-tax)
(35,251
)
 
4,292

 
3,448

 
(27,511
)
Income tax impact of amounts reclassified
13,956

 
(1,699
)
 
(1,230
)
 
11,027

 Other OCI changes (pre-tax)
34,295

 
(2,958
)
 
(1,002
)
 
30,335

Income tax impact of other OCI changes
(13,577
)
 
1,187

 
349

 
(12,041
)
Net change after income taxes
(577
)
 
822

 
1,565

 
1,810

Balance at December 31, 2011
15,634

 
(82,432
)
 
(58
)
 
(66,856
)
 Amounts reclassified from AOCI (pre-tax)
(37,269
)
 
4,611

 
182

 
(32,476
)
Income tax impact of amounts reclassified
14,755

 
(1,825
)
 
(65
)
 
12,865

 Other OCI changes (pre-tax)
38,548

 
(30,084
)
 
(428
)
 
8,036

Income tax impact of other OCI changes
(15,262
)
 
11,910

 
153

 
(3,199
)
Net change after income taxes
772

 
(15,388
)
 
(158
)
 
(14,774
)
Balance at December 31, 2012
16,406

 
(97,820
)
 
(216
)
 
(81,630
)
 Amounts reclassified from AOCI (pre-tax)
(11,956
)
 
6,364

 
207

 
(5,385
)
Income tax impact of amounts reclassified
4,734

 
(2,524
)
 
(73
)
 
2,137

 Other OCI changes (pre-tax)
27,419

 
17,136

 
(279
)
 
44,276

Income tax impact of other OCI changes
(10,855
)
 
(6,781
)
 
98

 
(17,538
)
Net change after income taxes
9,342

 
14,195

 
(47
)
 
23,490

Balance at December 31, 2013
$
25,748

 
$
(83,625
)
 
$
(263
)
 
$
(58,140
)
 
 
Accumulated Other Comprehensive Income (Loss)
 
Unrealized Gain on Available-for-Sale Securities
 
Pension
Liability
Adjustment
 
Fair Value Adjustment for Cash Flow Hedges
 
Total
 
 
 
(In thousands)
 
 
PNM
 
 
 
 
 
 
 
Balance at December 31, 2010
$
16,211

 
$
(82,981
)
 
$
(16
)
 
$
(66,786
)
 Amounts reclassified from AOCI (pre-tax)
(35,251
)
 
4,278

 
27

 
(30,946
)
Income tax impact of amounts reclassified
13,956

 
(1,694
)
 
(11
)
 
12,251

 Other OCI changes (pre-tax)
34,295

 
(3,369
)
 
—

 
30,926

Income tax impact of other OCI changes
(13,577
)
 
1,334

 
—

 
(12,243
)
Net change after income taxes
(577
)
 
549

 
16

 
(12
)
Balance at December 31, 2011
15,634

 
(82,432
)
 
—

 
(66,798
)
 Amounts reclassified from AOCI (pre-tax)
(37,269
)
 
4,611

 
—

 
(32,658
)
Income tax impact of amounts reclassified
14,755

 
(1,825
)
 
—

 
12,930

 Other OCI changes (pre-tax)
38,548

 
(30,084
)
 
—

 
8,464

Income tax impact of other OCI changes
(15,262
)
 
11,910

 
—

 
(3,352
)
Net change after income taxes
772

 
(15,388
)
 
—

 
(14,616
)
Balance at December 31, 2012
16,406

 
(97,820
)
 
—

 
(81,414
)
 Amounts reclassified from AOCI (pre-tax)
(11,956
)
 
6,364

 
—

 
(5,592
)
Income tax impact of amounts reclassified
4,734

 
(2,524
)
 
—

 
2,210

 Other OCI changes (pre-tax)
27,419

 
17,136

 
—

 
44,555

Income tax impact of other OCI changes
(10,855
)
 
(6,781
)
 
—

 
(17,636
)
Net change after income taxes
9,342

 
14,195

 
—

 
23,537

Balance at December 31, 2013
$
25,748

 
$
(83,625
)
 
$
—

 
$
(57,877
)
 
Accumulated Other Comprehensive Income (Loss)
 
Unrealized Gain on Available-for-Sale Securities
 
Pension
Liability
Adjustment
 
Fair Value Adjustment for Cash Flow Hedges
 
Total
 
 
 
(In thousands)
 
 
TNMP
 
 
 
 
 
 
 
Balance at December 31, 2010
$
—

 
$
(275
)
 
$
(1,210
)
 
$
(1,485
)
 Amounts reclassified from AOCI (pre-tax)
—

 
13

 
2,997

 
3,010

Income tax impact of amounts reclassified
—

 
(5
)
 
(1,068
)
 
(1,073
)
 Other OCI changes (pre-tax)
—

 
414

 
(1,207
)
 
(793
)
Income tax impact of other OCI changes
—

 
(147
)
 
430

 
283

Net change after income taxes
—

 
275

 
1,152

 
1,427

Balance at December 31, 2011
—

 
—

 
(58
)
 
(58
)
 Amounts reclassified from AOCI (pre-tax)
—

 
—

 
182

 
182

Income tax impact of amounts reclassified
—

 
—

 
(65
)
 
(65
)
 Other OCI changes (pre-tax)
—

 
—

 
(428
)
 
(428
)
Income tax impact of other OCI changes
—

 
—

 
153

 
153

Net change after income taxes
—

 
—

 
(158
)
 
(158
)
Balance at December 31, 2012
—

 
—

 
(216
)
 
(216
)
 Amounts reclassified from AOCI (pre-tax)
—

 
—

 
207

 
207

Income tax impact of amounts reclassified
—

 
—

 
(73
)
 
(73
)
 Other OCI changes (pre-tax)
—

 
—

 
(279
)
 
(279
)
Income tax impact of other OCI changes
—

 
—

 
98

 
98

Net change after income taxes
—

 
—

 
(47
)
 
(47
)
Balance at December 31, 2013
$
—

 
$
—

 
$
(263
)
 
$
(263
)