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Commercial Loans - Additional Information (Detail) (USD $) | 9 Months Ended |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Commercial Loans Held For Investment | Dec. 31, 2013 Commercial Loans Held For Investment | Sep. 30, 2014 Commercial Loans Held For Sale | Sep. 30, 2014 Commercial Loans Held For Sale Contract | Dec. 31, 2013 Commercial Loans Held For Sale Contract | Sep. 30, 2014 Commercial Loans Held-for-Investment, at Amortized Cost | Sep. 30, 2014 Commercial Loans Held-for-Investment, at Amortized Cost Contract | Dec. 31, 2013 Commercial Loans Held-for-Investment, at Amortized Cost Contract | Sep. 30, 2014 Commercial Loans Held-for-Investment, at Amortized Cost Originated During 2014 | Sep. 30, 2014 Commercial Loans Held-for-Investment, at Amortized Cost Originated During 2013 | Dec. 31, 2013 Commercial Loans Held-for-Investment, at Amortized Cost Originated During 2013 | Sep. 30, 2014 Commercial Loans Held-for-Investment, at Amortized Cost Originated During 2012 | Dec. 31, 2013 Commercial Loans Held-for-Investment, at Amortized Cost Originated During 2012 | Sep. 30, 2014 Commercial Loans Held-for-Investment, at Amortized Cost Originated During 2011 | Dec. 31, 2013 Commercial Loans Held-for-Investment, at Amortized Cost Originated During 2011 | Sep. 30, 2014 Commercial Loans Held-for-Investment, at Amortized Cost Originated During 2010 | Dec. 31, 2013 Commercial Loans Held-for-Investment, at Amortized Cost Originated During 2010 | Sep. 30, 2014 Commercial Loans Held-for-Investment, at Fair Value | Sep. 30, 2014 Commercial Loans Held-for-Investment, at Fair Value Contract
Commercial Loans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial loans financed through Commercial Securitization entity |  |  |  | $ 205,000,000 | $ 258,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans |  |  |  |  |  |  | 7 | 7 |  | 55 | 50 |  |  |  |  |  |  |  |  |  |  | 3
Principal value |  |  |  |  |  | 103,000,000 | 103,000,000 | 88,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 68,000,000 | 68,000,000
Carrying Value | 497,997,000 |  | 432,455,000 | 393,288,000 | 343,344,000 | 104,709,000 | 104,709,000 | 89,111,000 | 322,576,000 | 322,576,000 | 343,344,000 |  |  |  |  |  |  |  |  |  | 70,712,000 | 70,712,000
Senior commercial loans, held for sale | 6,844,403,000 | 6,864,921,000 |  |  |  | 340,000,000 | 578,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31,000,000
Valuation adjustments |  |  |  |  |  | 4,000,000 | 14,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | (420,000) | 2,000,000
Principal balance |  |  |  |  |  |  |  |  | 332,258,000 | 332,258,000 | 353,331,000 |  |  |  |  |  |  |  |  |  |  |
Senior commercial loans, held for Investment |  |  |  |  |  |  |  |  | 26,000,000 | 34,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Recorded investment |  |  |  |  |  |  |  |  | $ 330,005,000 | $ 330,005,000 | $ 350,717,000 |  |  |  |  |  |  |  |  |  |  |
Percentage of loan portfolio |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 20.00% | 19.00% | 37.00% | 43.00% | 29.00% | 34.00% | 4.00% | 4.00% |  |

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- Definition Loans Financed through Securitization + References No definition available. + Details
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- Definition Percentage Of Loan Portfolio + References No definition available. + Details
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- Definition Reflects the aggregate gross carrying amount of all commercial loans and leases held in portfolio, prior to deducting deferred income and the allowance for losses on commercial loans and leases. + References Reference 1: 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=35738203&loc=d3e5074-111524 Reference 2: 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 Reference 3: 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=35738203&loc=d3e5066-111524 + 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 commercial loans and leases receivable including, but not limited to, commercial and industrial loans, agricultural loans, mortgage loans, promissory notes, interbank and other loans to financial institutions, draws against credit facilities, trade financing, lease financings. 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 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 2: 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 Reference 3: 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=35738203&loc=d3e5066-111524 + Details
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- Definition Indicates the number of mortgages under each classification. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.3) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Paragraph 3 -Article 12 + Details
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- Definition The total periodic movement (increases and decreases) in the carrying amount of mortgage loans on real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + 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 210.5-02.3) -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 3 -Article 5 + Details
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- Definition The cash outflow associated with purchasing loans held for investment purposes during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The aggregate cash outflow used to purchase all loans that are held with the intention to resell in the near future. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3461-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 230 -Section 55 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=34726456&loc=d3e60097-112785 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3367-108585 + Details
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- Definition This is the sum of principal amount outstanding for both securitized and unsecuritized loans of all types. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107314-111719 + Details
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