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Weighted Average Maturities and Interest Rates of Borrowings (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Debt Instrument [Line Items] |  |
Debt Balance | $ 225,158 | $ 542,027
Weighted Average Remaining Maturity | 1 year 1 month 6 days | 1 year 3 months 18 days
Weighted Average Rate | 1.80% | 2.30%
Wells Facility borrowings [Member] |  |
Debt Instrument [Line Items] |  |
Debt Balance | 225,155 | 221,980
Weighted Average Remaining Maturity | 1 year 1 month 6 days | 1 year 7 months 6 days
Weighted Average Rate | 1.80% | 1.50%
JPMorgan Facility borrowings [Member] |  |
Debt Instrument [Line Items] |  |
Debt Balance | 3 | 68,720
Weighted Average Remaining Maturity | 5 days | 10 months 24 days
Weighted Average Rate | 2.70% | 3.30%
TALF borrowings [Member] |  |
Debt Instrument [Line Items] |  |
Debt Balance |  | $ 251,327
Weighted Average Remaining Maturity |  | 1 year 3 months 18 days
Weighted Average Rate |  | 2.80%

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- Definition Carrying value, as of the balance sheet date, of securities sold under agreements to repurchase where the transferor maintains effective control over the assets, accounting for them as secured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 10 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=7580763&loc=d3e101761-111710 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 48, 100 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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