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Fair Value of Derivative and Other Financial Instruments, Debt Maturities (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012
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PNM Resources [Member] |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |
Held-to-maturity debt securities, Due within 1 year | $ 949
Held-to-maturity debt securities, After 1 year through 5 years | 98,804
Held-to-maturity debt securities, After 5 years through 10 years | 2,102
Held-to-maturity debt securities, Over 10 years | 0
Held-to-maturity debt securities | 101,855
Public Service Company of New Mexico [Member] |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |
Held-to-maturity debt securities, Due within 1 year | 949
Held-to-maturity debt securities, After 1 year through 5 years | 91,746
Held-to-maturity debt securities, After 5 years through 10 years | 0
Held-to-maturity debt securities, Over 10 years | 0
Held-to-maturity debt securities | 92,695
PNMR and PNM [Member] |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |
Available-for-sale debt securities, Within 1 year | 2,087
Available-for-sale debt securities, After 1 year through 5 years | 21,540
Available-for-sale debt securities, After 5 years through 10 years | 13,221
Available-for-sale debt securities, Over 10 years | 42,104
Available-for-sale debt securities | $ 78,952

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