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Residential Loans - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 USD ($) loan | Sep. 30, 2015 USD ($) loan Contract | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) loan Contract
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Transfers from loans held-for-sale to loans held-for-investment |  | $ 964,013 | $ 278,913 |
Transfers from loans held-for-investment to loans held-for-sale |  | 66,918 | $ 0 |
Principal balance of loans sold during period | $ 2,070,000 | 7,000,000 |  |
Carrying value of loans | $ 4,036,674 | $ 4,036,674 |  | $ 3,398,573
Percentage of fixed-rate loans | 97.00% | 97.00% |  |
Sequoia |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Carrying value of loans | $ 1,170,246 | $ 1,170,246 |  | $ 1,474,386
Fixed-rate loans |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Weighted average coupon rate | 4.10% | 4.10% |  |
Hybrid loans |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Weighted average coupon rate | 3.41% | 3.41% |  |
Residential Loans |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal value of loans purchased | $ 2,910,000 | $ 8,090,000 |  |
Residential Loans at Fair Value |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | Contract |  | 2,669 |  | 2,273
Loan Principal | 1,460,000 | $ 1,460,000 |  | $ 1,300,000
Valuation adjustments | 11,000 | 10,000 |  |
Loan pledged as collateral | 1,300,000 | $ 1,300,000 |  |
Residential Loans at Lower of Cost or Fair Value |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | Contract |  | 9 |  | 9
Loan Principal | 2,000 | $ 2,000 |  | $ 2,000
Carrying value of loans | 1,446 | 1,446 |  | 1,488
Residential Loans at Lower of Cost or Fair Value | Sequoia |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Carrying value of loans | 0 | $ 0 |  | $ 0
Residential Loans Held For Investment at Fair Value |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | Contract |  | 1,808 |  | 803
Loan Principal | 1,330,000 | $ 1,330,000 |  | $ 566,000
Valuation adjustments | $ 9,000 | $ 5,000 |  |
Financing Receivable, Number Of Loans Past Due 90 Days Or More | loan | 0 | 0 |  | 1
Transfers from loans held-for-sale to loans held-for-investment | $ 300,000 | $ 962,000 |  |
Transfers from loans held-for-investment to loans held-for-sale | $ 67,000 |  |  |
Weighted average original Fair Isaac Corporation (FICO) score | 772 | 772 |  |
Weighted average original loan-to-value (LTV) | 64.00% | 64.00% |  |
Residential Loans Held For Investment at Fair Value | Sequoia |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | Contract |  | 4,815 |  | 5,315
Weighted average original Fair Isaac Corporation (FICO) score | 732 | 732 |  |
Weighted average original loan-to-value (LTV) | 66.00% | 66.00% |  |
Loans held-for-investment, delinquent greater than 90 days | $ 63,000 | $ 63,000 |  | $ 73,000
Loans held-for-investment, in foreclosure | 32,000 | 32,000 |  | 39,000
Valuation adjustments | 400 | (5,000) |  |
Residential Loans Held For Investment at Fair Value | FHLB Chicago |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Loan pledged as collateral | 1,360,000 | 1,360,000 |  |
Residential Loans Held for Investment |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Loan Principal | 1,275,609 | 1,275,609 |  | 1,483,213
Carrying value of loans | 1,170,246 | 1,170,246 |  | 1,474,386
Unamortized premium, net | 0 | 0 |  | 12,511
Allowance for loan losses | $ 0 | 0 |  | $ 21,338
Mortgage servicing rights |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal balance of mortgage servicing rights purchased from third-party originators |  | $ 2,220,000 |  |

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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6873192&loc=d3e21338-158488 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of consumer loans, including, but not limited to, mortgage, home equity, vehicles, credit card, installment, and lease financing. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5066-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5086-111524 + Details
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