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Commercial Mortgage Residual Interests Commercial Mortgage Residual Interests (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2013 securitizations | Sep. 30, 2012 | Sep. 30, 2013 securitizations | Sep. 30, 2012 | Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Number of securitizations |  |  | 7 |  |  |  |
Discount rate |  |  |  |  |  | 25.00% |
Loss severity of loans in foreclosure |  |  | 20.00% |  |  | 20.00% |
LIBOR |  |  | Forward 3-month curve |  |  | Forward 3-month curve |
Prime |  |  | Forward curve |  |  | Forward curve |
Number of securitizations, discount rate valuation adjustment at 20% | 3 |  | 3 |  |  |  |
Number of securitization, discount rate valuation adjustment at 25% | 4 |  | 4 |  |  |  |
Unrealized gains | $ 376 | $ 0 | $ 1,595 |  | $ 213 |  |
Other than temporary valuation impairment | $ 16 | $ 0 | $ 16 |  | $ 2,718 |  |
Maximum [Member] |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Discount rate |  |  | 25.00% |  |  |  |
Average life equivalent CPR speeds range |  |  | 19.39% | [1] |  | 24.31% | [1]
Foreclosures frequency curve default model |  |  | 3.97% |  |  | 4.49% |
Minimum [Member] |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Discount rate |  |  | 20.00% |  |  |  |
Average life equivalent CPR speeds range |  |  | 0.80% | [1] |  | 0.80% | [1]
Foreclosures frequency curve default model |  |  | 0.07% |  |  | 0.09% |
[1] |

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- Definition Average Life Equivalent CPR Speeds Range Assumption + References No definition available. + Details
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- Definition Discount Rate Valuation Adjustment Assumption + References No definition available. + Details
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- Definition Foreclosures Frequency Curve Default Model Assumption + References No definition available. + Details
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- Definition Libor Yield Assumption + References No definition available. + Details
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- Definition Loss Severity of Loans in Foreclosure Assumption + References No definition available. + Details
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Namespace Prefix: | nnn_
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Balance Type: | na
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- Definition Number of Securitization, Discount Rate Valuation Adjustment at 25% + References No definition available. + Details
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- Definition Number of Securitizations + References No definition available. + Details
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- Definition Number of Securitizations, Discount Rate Valuation Adjustment at 20% + References No definition available. + Details
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- Definition Other comprehensive Income - Unrealized gain/loss on interest in financial instruments (typically securitized receivables) that continue to be held during the period. + References No definition available. + Details
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- Definition Yield Prime Assumption + References No definition available. + Details
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- Definition The charge against earnings to reduce the carrying value of an interest continued to be held by the transferor in a securitized financial instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 40 -Section 35 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=16385214&loc=d3e44297-111616 + Details
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- Details
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