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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative [Line Items] |  |
Fair Value | $ (1,575,000) | $ (127,723,000)
Notional Amount | 224,803,000 | 13,589,356,000
TBAs |  |
Derivative [Line Items] |  |
Notional Amount | 0 | 6,610,000,000
Interest rate futures |  |
Derivative [Line Items] |  |
Notional Amount |  | 226,000,000
Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (1,932,000) | (163,424,000)
Notional Amount | 199,932,000 | 6,929,494,000
Derivative Liabilities | Interest rate swaps |  |
Derivative [Line Items] |  |
Fair Value | 0 | (97,235,000)
Notional Amount | 0 | 2,314,300,000
Derivative Liabilities | Interest rate swaps | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Fair Value | 0 | (51,530,000)
Notional Amount | 0 | 139,500,000
Derivative Liabilities | TBAs |  |
Derivative [Line Items] |  |
Fair Value | 0 | (13,359,000)
Notional Amount | 0 | 4,160,000,000
Derivative Liabilities | Interest rate futures |  |
Derivative [Line Items] |  |
Fair Value | 0 | (10,000)
Notional Amount | 0 | 12,300,000
Derivative Liabilities | Loan purchase and interest rate lock commitments |  |
Derivative [Line Items] |  |
Fair Value | (1,932,000) | (1,290,000)
Notional Amount | 199,932,000 | 303,394,000
Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 357,000 | 35,701,000
Notional Amount | 24,871,000 | 6,659,862,000
Derivative Assets | Interest rate swaps |  |
Derivative [Line Items] |  |
Fair Value | 0 | 17,095,000
Notional Amount | 0 | 1,399,000,000
Derivative Assets | TBAs |  |
Derivative [Line Items] |  |
Fair Value | 0 | 5,755,000
Notional Amount | 0 | 2,445,000,000
Derivative Assets | Interest rate futures |  |
Derivative [Line Items] |  |
Fair Value | 0 | 777,000
Notional Amount | 0 | 213,700,000
Derivative Assets | Swaptions |  |
Derivative [Line Items] |  |
Fair Value | 0 | 1,925,000
Notional Amount | 0 | 1,065,000,000
Derivative Assets | Loan purchase and interest rate lock commitments |  |
Derivative [Line Items] |  |
Fair Value | 357,000 | 10,149,000
Notional Amount | $ 24,871,000 | $ 1,537,162,000

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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=121572278&loc=d3e13433-108611 + Details
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