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Fair Value of Derivative and Other Financial Instruments - Maturities of Debt Securities (Details) $ in Thousands | Dec. 31, 2015 USD ($)
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PNMR and PNM [Member] |
Available-for-Sale |
Within 1 year | $ 3,858
After 1 year through 5 years | 24,136
After 5 years through 10 years | 26,401
After 10 years through 15 years | 10,843
After 15 years through 20 years | 10,815
After 20 years | 38,745
Available-for-sale debt securities | 114,798
PNM Resources [Member] |
Held-to-Maturity |
Within 1 year | 8,947
After 1 year through 5 years | 665
After 5 years through 10 years | 0
After 10 years through 15 years | 0
After 15 years through 20 years | 0
After 20 years | 0
Held-to-maturity debt securities | 9,612
Public Service Company of New Mexico [Member] |
Held-to-Maturity |
Within 1 year | 8,947
After 1 year through 5 years | 0
After 5 years through 10 years | 0
After 10 years through 15 years | 0
After 15 years through 20 years | 0
After 20 years | 0
Held-to-maturity debt securities | $ 8,947

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- Definition Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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