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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
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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

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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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