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v2.4.1.9

Short-Term Debt by Weighted Average Interest Rates and Collateral Type (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Short-term Debt [Line Items] |  |
Amount Borrowed | $ 1,793,825 us-gaap_ShortTermBorrowings | $ 862,763 us-gaap_ShortTermBorrowings
Weighted Average Interest Rate | 1.73%us-gaap_ShortTermDebtWeightedAverageInterestRate | 1.42%us-gaap_ShortTermDebtWeightedAverageInterestRate
Weighted Average Days Until Maturity | 112 days | 61 days
Residential Loans |  |
Short-term Debt [Line Items] |  |
Amount Borrowed | 1,076,188 us-gaap_ShortTermBorrowings / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_ResidentialMortgageMember | 184,789 us-gaap_ShortTermBorrowings / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_ResidentialMortgageMember
Weighted Average Interest Rate | 1.74%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_ResidentialMortgageMember | 1.71%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_ResidentialMortgageMember
Weighted Average Days Until Maturity | 156 days | 228 days
Commercial Loans |  |
Short-term Debt [Line Items] |  |
Amount Borrowed | 109,128 us-gaap_ShortTermBorrowings / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_CommercialLoanMember |
Weighted Average Interest Rate | 3.66%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_CommercialLoanMember |
Weighted Average Days Until Maturity | 185 days | 0 days
Real Estate Securities |  |
Short-term Debt [Line Items] |  |
Amount Borrowed | $ 608,509 us-gaap_ShortTermBorrowings / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember | $ 677,974 us-gaap_ShortTermBorrowings / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember
Weighted Average Interest Rate | 1.38%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember | 1.34%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember
Weighted Average Days Until Maturity | 20 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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- Definition Weighted average interest rate of short-term debt outstanding. + References Reference 1: 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(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph b -Article 5 + Details
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