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Effect of Derivative Instruments on Consolidated Statements of Operations and Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) Gain Included in Mortgage Banking Income	$ (12,154)	$ (1,969)	$ 14,310
Treasury Options
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) Gain Included in Mortgage Banking Income	(2,795)	(8,222)	1,968
Eurodollar Futures
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) Gain Included in Mortgage Banking Income	165	501	333
Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) Gain Included in Mortgage Banking Income	(4,561)
Forward commitments to buy/sell loans/mortgage-backed securities
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) Gain Included in Mortgage Banking Income	$ (4,963)	$ 5,752	$ 12,009

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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