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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative [Line Items] |  |
Fair Value | $ 44,495 | $ (47,363)
Notional Amount | 6,645,489 | 6,644,081
TBAs |  |
Derivative [Line Items] |  |
Notional Amount | 1,980,000 | 1,700,000
Futures |  |
Derivative [Line Items] |  |
Notional Amount | 15,000 | 8,000
Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (42,724) | (63,081)
Notional Amount | 1,656,136 | 3,485,466
Derivative Liabilities | Interest rate swaps |  |
Derivative [Line Items] |  |
Fair Value | (11,785) | (11,888)
Notional Amount | 565,500 | 1,248,000
Derivative Liabilities | Interest rate swaps | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Fair Value | (26,796) | (43,679)
Notional Amount | 139,500 | 139,500
Derivative Liabilities | TBAs |  |
Derivative [Line Items] |  |
Fair Value | (1,744) | (3,808)
Notional Amount | 500,000 | 1,400,000
Derivative Liabilities | Loan purchase commitments |  |
Derivative [Line Items] |  |
Fair Value | (2,399) | (3,706)
Notional Amount | 451,136 | 697,966
Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 87,219 | 15,718
Notional Amount | 4,989,353 | 3,158,615
Derivative Assets | Interest rate swaps |  |
Derivative [Line Items] |  |
Fair Value | 78,006 | 10,122
Notional Amount | 3,139,000 | 1,765,000
Derivative Assets | TBAs |  |
Derivative [Line Items] |  |
Fair Value | 6,987 | 133
Notional Amount | 1,480,000 | 295,000
Derivative Assets | Futures |  |
Derivative [Line Items] |  |
Fair Value | 44 | 1
Notional Amount | 15,000 | 7,500
Derivative Assets | Swaptions |  |
Derivative [Line Items] |  |
Fair Value | 0 | 42
Notional Amount | 0 | 200,000
Derivative Assets | Loan purchase commitments |  |
Derivative [Line Items] |  |
Fair Value | 2,182 | 3,243
Notional Amount | 355,353 | 547,434
Derivative Assets | Loan forward sale commitments |  |
Derivative [Line Items] |  |
Fair Value | 0 | 2,177
Notional Amount | $ 0 | $ 343,681

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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