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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Fair Value	$ (65,493)	$ (46,401)
Notional Amount	4,635,085	6,483,976
Derivative Liabilities
Derivative [Line Items]
Fair Value	(97,468)	(62,794)
Notional Amount	2,102,769	3,083,315
Derivative Assets
Derivative [Line Items]
Fair Value	31,975	16,393
Notional Amount	2,532,316	3,400,661
Interest rate swaps | Derivative Liabilities
Derivative [Line Items]
Fair Value	(29,693)	(10,134)
Notional Amount	968,500	1,039,500
Interest rate swaps | Cash Flow Hedging | Derivative Liabilities
Derivative [Line Items]
Fair Value	(62,407)	(48,232)
Notional Amount	139,500	139,500
Interest rate swaps | Derivative Assets
Derivative [Line Items]
Fair Value	8,647	2,590
Notional Amount	525,000	658,000
TBAs | Derivative Liabilities
Derivative [Line Items]
Fair Value	(3,739)	(2,519)
Notional Amount	581,000	1,450,500
TBAs | Derivative Assets
Derivative [Line Items]
Fair Value	2,843	2,734
Notional Amount	569,500	1,028,500
Futures | Derivative Liabilities
Derivative [Line Items]
Fair Value	(1,324)	(445)
Notional Amount	150,000	78,000
Swaptions | Derivative Assets
Derivative [Line Items]
Fair Value	15,541	5,191
Notional Amount	570,000	925,000
Credit Default Index Swaps | Derivative Assets
Derivative [Line Items]
Fair Value	0	1,207
Notional Amount	0	25,000
Loan Purchase Commitments | Derivative Liabilities
Derivative [Line Items]
Fair Value	(305)	(1,464)
Notional Amount	263,769	375,815
Loan Purchase Commitments | Derivative Assets
Derivative [Line Items]
Fair Value	4,944	4,671
Notional Amount	$ 867,816	$ 764,161

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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X

- 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

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+ References

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