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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Fair Value	$ (49,421)	$ (41,914)
Notional Amount	7,538,483	3,663,084
Derivative Liabilities
Derivative [Line Items]
Fair Value	(88,044)	(58,331)
Notional Amount	3,289,289	1,675,617
Derivative Assets
Derivative [Line Items]
Fair Value	38,623	16,417
Notional Amount	4,249,194	1,987,467
Interest rate swaps | Derivative Liabilities
Derivative [Line Items]
Fair Value	(20,562)	(1,328)
Notional Amount	1,009,500	206,000
Interest rate swaps | Cash Flow Hedging | Derivative Liabilities
Derivative [Line Items]
Fair Value	(51,853)	(46,845)
Notional Amount	139,500	139,500
Interest rate swaps | Derivative Assets
Derivative [Line Items]
Fair Value	4,351	0
Notional Amount	475,000	0
TBAs | Derivative Liabilities
Derivative [Line Items]
Fair Value	(14,994)	(9,506)
Notional Amount	1,915,000	1,110,000
TBAs | Derivative Assets
Derivative [Line Items]
Fair Value	8,910	6,654
Notional Amount	1,460,500	1,074,000
Futures | Derivative Liabilities
Derivative [Line Items]
Fair Value	(188)	(372)
Notional Amount	36,000	90,000
Swaptions | Derivative Assets
Derivative [Line Items]
Fair Value	12,437	7,006
Notional Amount	925,000	575,000
Credit Default Index Swaps | Derivative Assets
Derivative [Line Items]
Fair Value	2,792	1,597
Notional Amount	50,000	50,000
Loan Purchase Commitments | Derivative Liabilities
Derivative [Line Items]
Fair Value	(447)	(41)
Notional Amount	189,289	27,324
Loan Purchase Commitments | Derivative Assets
Derivative [Line Items]
Fair Value	10,133	1,160
Notional Amount	1,338,694	288,467
Loan forward Sales Commitments | Derivative Liabilities
Derivative [Line Items]
Fair Value	0	(239)
Notional Amount	$ 0	$ 102,793

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Article 12



-Section 13



-Sentence Column B

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 45



-Paragraph 6



-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 45



-Paragraph 5



-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 825



-SubTopic 10



-Section 50



-Paragraph 10



-Subparagraph (a)



-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 825



-SubTopic 10



-Section 50



-Paragraph 15



-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611

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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

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