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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Derivative [Line Items] |  |
Fair Value | $ (53,290) | $ (29,734)
Notional Amount | 6,244,759 | 4,980,343
TBAs |  |
Derivative [Line Items] |  |
Notional Amount | 1,940,000 | 1,360,000
Futures |  |
Derivative [Line Items] |  |
Notional Amount | 37,000 | 88,000
Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (65,238) | (66,329)
Notional Amount | 3,640,709 | 2,423,362
Derivative Liabilities | Interest rate swaps |  |
Derivative [Line Items] |  |
Fair Value | (12,901) | (12,097)
Notional Amount | 1,838,500 | 1,101,500
Derivative Liabilities | Interest rate swaps | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Fair Value | (45,093) | (44,822)
Notional Amount | 139,500 | 139,500
Derivative Liabilities | TBAs |  |
Derivative [Line Items] |  |
Fair Value | (3,946) | (4,681)
Notional Amount | 950,000 | 510,000
Derivative Liabilities | Futures |  |
Derivative [Line Items] |  |
Fair Value | (423) | (928)
Notional Amount | 29,000 | 87,500
Derivative Liabilities | Loan purchase commitments |  |
Derivative [Line Items] |  |
Fair Value | (2,875) | (3,801)
Notional Amount | 683,709 | 584,862
Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 11,948 | 36,595
Notional Amount | 2,604,050 | 2,556,981
Derivative Assets | Interest rate swaps |  |
Derivative [Line Items] |  |
Fair Value | 3,645 | 19,859
Notional Amount | 509,000 | 1,009,000
Derivative Assets | TBAs |  |
Derivative [Line Items] |  |
Fair Value | 2,875 | 8,300
Notional Amount | 985,000 | 850,000
Derivative Assets | Futures |  |
Derivative [Line Items] |  |
Fair Value | 135 | 0
Notional Amount | 7,500 | 0
Derivative Assets | Swaptions |  |
Derivative [Line Items] |  |
Fair Value | 297 | 5,121
Notional Amount | 300,000 | 345,000
Derivative Assets | Loan purchase commitments |  |
Derivative [Line Items] |  |
Fair Value | 4,996 | 3,315
Notional Amount | $ 802,550 | $ 352,981

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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=73719730&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=73719730&loc=d3e13495-108611 + Details
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