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Short-Term Debt by Weighted Average Interest Rates and Collateral Type (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Short-term Debt [Line Items] |  |
Amount Borrowed | $ 1,887,688 | $ 862,763
Weighted Average Interest Rate | 1.69% | 1.42%
Weighted Average Days Until Maturity | 154 days | 61 days
Residential Loans |  |
Short-term Debt [Line Items] |  |
Amount Borrowed | 1,188,179 | 184,789
Weighted Average Interest Rate | 1.71% | 1.71%
Weighted Average Days Until Maturity | 216 days | 228 days
Commercial Loans |  |
Short-term Debt [Line Items] |  |
Amount Borrowed | 52,895 |
Weighted Average Interest Rate | 5.15% |
Weighted Average Days Until Maturity | 359 days |
Real Estate Securities |  |
Short-term Debt [Line Items] |  |
Amount Borrowed | $ 646,614 | $ 677,974
Weighted Average Interest Rate | 1.37% | 1.34%
Weighted Average Days Until Maturity | 23 days | 15 days

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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),16(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Subparagraph a(1) -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2, 3 -Article 9 + Details
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