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Fair Value of Derivative and Other Financial Instruments, Debt Maturities (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 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 | $ 2,342
Held-to-maturity debt securities, After 1 year through 5 years | 100,387
Held-to-maturity debt securities, After 5 years through 10 years | 2,088
Held-to-maturity debt securities, Over 10 years | 0
Held-to-maturity debt securities | 104,817
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 | 2,342
Held-to-maturity debt securities, After 1 year through 5 years | 93,340
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 | 95,682
PNMR and PNM [Member] |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |
Available-for-sale debt securities, Within 1 year | 2,057
Available-for-sale debt securities, After 1 year through 5 years | 21,281
Available-for-sale debt securities, After 5 years through 10 years | 12,185
Available-for-sale debt securities, Over 10 years | 41,222
Available-for-sale debt securities | $ 76,745

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