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Securities, at Fair Value (Narrative) (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2021 | Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Minimum term of fixed rate mortgages underlying MBS |  |  |  |  | 15 years |  |  |
Maximum term of fixed rate mortgages underlying MBS |  |  |  |  | 30 years |  |  |
Allowance for loan loss | $ 86,833,000 | $ 54,261,000 | $ 136,589,000 | $ 218,011,000 | $ 54,261,000 | $ 136,589,000 | $ 63,244,000 | $ 3,025,000
Impairment and other losses on securities available-for-sale and other assets |  | 0 | 5,094,000 |  | 0 | 424,745,000 |  |
Securities, at fair value |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Securities, at fair value | 239,000,000.0 | 196,500,000 |  |  | 196,500,000 |  |  |
Amortized costs | 184,900,000 | 147,200,000 |  |  | 147,200,000 |  |  |
Gross unrealized gains | $ 54,000,000.0 | 49,300,000 |  |  | $ 49,300,000 |  |  |
Weighted average yield | 12.30% |  |  |  | 12.70% |  |  |
Weighted average to maturity | 8 years 8 months 12 days |  |  |  | 6 years 3 months 18 days |  |  |
Proceeds from sale of MSR |  |  | 574,900,000 |  |  | 711,700,000 |  |
Realized losses |  |  | $ 53,300,000 |  |  | 28,700,000 |  |
Impairment |  |  |  | $ 280,800,000 |  |  |  |
Non-Agency MBS |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Securities, at fair value |  | 0 |  |  | $ 0 |  |  |
Allowance for loan loss |  | $ 0 |  |  | $ 0 |  |  |
MBS and MSR-Related Assets |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Impairment and other losses on securities available-for-sale and other assets |  |  |  |  |  | $ 63,500,000 |  |
Minimum | RPL/NPL MBS |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  | 3.00% |  |  |
Debt instrument, coupon step-up period |  |  |  |  | 36 months |  |  |
Maximum | RPL/NPL MBS |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  | 4.00% |  |  |
Debt instrument, coupon step-up period |  |  |  |  | 48 months |  |  |

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