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Mortgage Banking Activities, Net - Components of Mortgage Banking Activities (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Mortgage Loans on Real Estate [Line Items]
Mortgage banking activities, net	$ 7,728	$ 7,447	$ 14,946	$ 9,373
Residential Mortgage Banking Activities
Mortgage Loans on Real Estate [Line Items]
Other income (expense), net / other fee income	286	1,400	224	2,035
Mortgage banking activities, net	7,728	4,833	17,008	7,052
Residential Mortgage Banking Activities | Residential loans, at fair value
Mortgage Loans on Real Estate [Line Items]
Changes in fair value of assets	16,711	(2,122)	34,785	18,191
Residential Mortgage Banking Activities | Real estate securities
Mortgage Loans on Real Estate [Line Items]
Changes in fair value of assets	(29)	0
Residential Mortgage Banking Activities | Sequoia securities
Mortgage Loans on Real Estate [Line Items]
Changes in fair value of assets			1,455	(14,359)
Residential Mortgage Banking Activities | Risk managment derivatives
Mortgage Loans on Real Estate [Line Items]
Changes in fair value of risk management derivatives	(9,240)	5,555	(19,456)	1,185
Commercial Mortgage Banking Activities
Mortgage Loans on Real Estate [Line Items]
Other income (expense), net / other fee income	0	163	43	224
Mortgage banking activities, net	0	2,614	(2,062)	2,321
Commercial Mortgage Banking Activities | Risk managment derivatives
Mortgage Loans on Real Estate [Line Items]
Changes in fair value of risk management derivatives	0	1,464	(2,538)	(4,748)
Commercial Mortgage Banking Activities | Commercial loans, at fair value
Mortgage Loans on Real Estate [Line Items]
Changes in fair value of assets	$ 0	$ 987	$ 433	$ 6,845

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The net income attributable to mortgage banking activities. This includes market valuations related to residential and commercial loans, Sequoia IOs, and mortgage banking derivatives, as well as realized gains or losses associated with mortgage loan sales.

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Amount of unrealized gain (loss) related to the fair value of price risk derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

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Fees and other service revenues recognized in the period that are not otherwise specified in the taxonomy.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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