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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
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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

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- 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 + Details
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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 + Details
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