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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Derivative [Line Items] |  |
Fair Value | $ (63,237) | $ (46,401)
Notional Amount | 4,993,201 | 6,483,976
Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (100,117) | (62,794)
Notional Amount | 2,340,300 | 3,083,315
Derivative Liabilities | Interest rate swaps |  |
Derivative [Line Items] |  |
Fair Value | (24,499) | (10,134)
Notional Amount | 966,500 | 1,039,500
Derivative Liabilities | Interest rate swaps | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Fair Value | (70,672) | (48,232)
Notional Amount | 139,500 | 139,500
Derivative Liabilities | TBAs |  |
Derivative [Line Items] |  |
Fair Value | (4,335) | (2,519)
Notional Amount | 1,000,000 | 1,450,500
Derivative Liabilities | Futures |  |
Derivative [Line Items] |  |
Fair Value | (54) | (445)
Notional Amount | 15,000 | 78,000
Derivative Liabilities | Loan purchase commitments |  |
Derivative [Line Items] |  |
Fair Value | (557) | (1,464)
Notional Amount | 219,300 | 375,815
Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 36,880 | 16,393
Notional Amount | 2,652,901 | 3,400,661
Derivative Assets | Interest rate swaps |  |
Derivative [Line Items] |  |
Fair Value | 16,839 | 2,590
Notional Amount | 580,000 | 658,000
Derivative Assets | TBAs |  |
Derivative [Line Items] |  |
Fair Value | 1,514 | 2,734
Notional Amount | 555,000 | 1,028,500
Derivative Assets | Futures |  |
Derivative [Line Items] |  |
Fair Value | 257 | 0
Notional Amount | 130,000 | 0
Derivative Assets | Swaptions |  |
Derivative [Line Items] |  |
Fair Value | 12,234 | 5,191
Notional Amount | 495,000 | 925,000
Derivative Assets | Credit default index swaps |  |
Derivative [Line Items] |  |
Fair Value | 0 | 1,207
Notional Amount | 0 | 25,000
Derivative Assets | Loan purchase commitments |  |
Derivative [Line Items] |  |
Fair Value | 6,036 | 4,671
Notional Amount | $ 892,901 | $ 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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