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Residential Mortgage Securities and MSR Related Assets (Sales of Residential Mortgage Securities) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds | $ 3,062,858 | $ 908,696 | $ 538,965
Gains/(Losses) | 61,697 | 62,002 | 61,307
Agency MBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds | 1,500,875 | 360,634 | 122,027
Gains/(Losses) | (19,291) | 499 | (6,810)
Non-Agency MBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds | 1,318,958 | 291,391 | 117,060
Gains/(Losses) | 107,999 | 50,360 | 36,744
CRT securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds | 243,025 | 256,671 | 299,878
Gains/(Losses) | $ (27,011) | $ 11,143 | $ 31,373

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- Definition Net gain (loss) resulting from the sales of securitized, pay-through debt securities collateralized by real estate mortgage loans (mortgages). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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- Definition Amount of cash inflow from sale of investment in mortgage-backed security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + 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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