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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative [Line Items] |  |
Fair Value | $ (147,238) | $ (49,066)
Notional Amount | 7,597,742 | 5,911,385
TBAs |  |
Derivative [Line Items] |  |
Notional Amount | 2,100,000 | 1,460,000
Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (173,847) | (84,855)
Notional Amount | 4,618,911 | 2,953,724
Derivative Liabilities | Interest rate swaps |  |
Derivative [Line Items] |  |
Fair Value | (118,609) | (36,416)
Notional Amount | 3,084,300 | 1,742,000
Derivative Liabilities | Interest rate swaps | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Fair Value | (49,827) | (34,492)
Notional Amount | 139,500 | 139,500
Derivative Liabilities | TBAs |  |
Derivative [Line Items] |  |
Fair Value | (4,639) | (13,215)
Notional Amount | 1,150,000 | 935,000
Derivative Liabilities | Loan purchase commitments |  |
Derivative [Line Items] |  |
Fair Value | (772) | (732)
Notional Amount | 245,111 | 137,224
Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 26,609 | 35,789
Notional Amount | 2,978,831 | 2,957,661
Derivative Assets | Interest rate swaps |  |
Derivative [Line Items] |  |
Fair Value | 18,576 | 28,211
Notional Amount | 1,053,000 | 2,106,500
Derivative Assets | TBAs |  |
Derivative [Line Items] |  |
Fair Value | 1,784 | 4,665
Notional Amount | 950,000 | 520,000
Derivative Assets | Swaptions |  |
Derivative [Line Items] |  |
Fair Value | 682 | 0
Notional Amount | 200,000 | 0
Derivative Assets | Loan purchase commitments |  |
Derivative [Line Items] |  |
Fair Value | 5,567 | 2,913
Notional Amount | $ 775,831 | $ 331,161

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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