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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, 2012 | Sep. 30, 2011 | Sep. 30, 2012 securitizations | Sep. 30, 2011 | Dec. 31, 2011
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Number of securitizations |  |  | 7 |  |  |  |
Discount rate |  |  | 25.00% |  |  | 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 |
Unrealized gains |  |  | $ 213 |  | $ 599 |  |
Other than temporary valuation impairment | $ 0 | $ 0 | $ 2,718 |  | $ 396 |  |
Maximum [Member] |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Average life equivalent CPR speeds range |  |  | 20.42% | [1] |  | 18.57% | [1]
Foreclosures frequency curve default model |  |  | 3.90% |  |  | 4.70% |
Minimum [Member] |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Average life equivalent CPR speeds range |  |  | 0.80% | [1] |  | 2.18% | [1]
Foreclosures frequency curve default model |  |  | 0.10% |  |  | 0.20% |
[1] | Conditional prepayment rate.

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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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- Definition Number of Securitizations + 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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6943989&loc=d3e3602-108585 Reference 3: 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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