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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
	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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Loans Financed through Securitization

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Percentage Of Loan Portfolio

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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.

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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.

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Indicates the number of mortgages under each classification.

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The total periodic movement (increases and decreases) in the carrying amount of mortgage loans on real estate.

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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.

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The cash outflow associated with purchasing loans held for investment purposes during the period.

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The aggregate cash outflow used to purchase all loans that are held with the intention to resell in the near future.

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This is the sum of principal amount outstanding for both securitized and unsecuritized loans of all types.

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