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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Fair Value	$ (46,401)	$ (41,914)
Notional amount	6,483,976	3,663,084
Derivative Liabilities
Derivative [Line Items]
Fair Value	(62,794)	(58,331)
Notional amount	3,083,315	1,675,617
Derivative Assets
Derivative [Line Items]
Fair Value	16,393	16,417
Notional amount	3,400,661	1,987,467
Interest Rate Swaps | Derivative Liabilities
Derivative [Line Items]
Fair Value	(10,134)	(1,328)
Notional amount	1,039,500	206,000
Interest Rate Swaps | Derivative Liabilities | Cash Flow Hedging
Derivative [Line Items]
Fair Value	(48,232)	(46,845)
Notional amount	139,500	139,500
Interest Rate Swaps | Derivative Assets
Derivative [Line Items]
Fair Value	2,590	0
Notional amount	658,000	0
TBAs | Derivative Liabilities
Derivative [Line Items]
Fair Value	(2,519)	(9,506)
Notional amount	1,450,500	1,110,000
TBAs | Derivative Assets
Derivative [Line Items]
Fair Value	2,734	6,654
Notional amount	1,028,500	1,074,000
Futures | Derivative Liabilities
Derivative [Line Items]
Fair Value	(445)	(372)
Notional amount	78,000	90,000
Swaptions | Derivative Assets
Derivative [Line Items]
Fair Value	5,191	7,006
Notional amount	925,000	575,000
Credit default index swaps | Derivative Assets
Derivative [Line Items]
Fair Value	1,207	1,597
Notional amount	25,000	50,000
Loan Purchase Commitments | Derivative Liabilities
Derivative [Line Items]
Fair Value	(1,464)	(41)
Notional amount	375,815	27,324
Loan Purchase Commitments | Derivative Assets
Derivative [Line Items]
Fair Value	4,671	1,160
Notional amount	764,161	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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