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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Derivative Notional Balance |  |  |
Notional balance | $ 2,597,937 |  | $ 1,254,905
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 20,329 |  | 23,246
Derivative liability, notional amount | 2,462,500 |  | 420,000
Derivative liability, fair value | (20,518) |  | (4,638)
Gains (losses) on derivatives | (11,362) | $ 46,871 |
Forward loans IRLCs |  |  |
Derivative Notional Balance |  |  |
Notional balance | 1,222,451 |  | 619,713
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 13,407 |  | 22,224
Gains (losses) on derivatives | (8,817) | 16,860 |
Reverse loans IRLCs |  |  |
Derivative Notional Balance |  |  |
Notional balance | 80,486 |  | 11,692
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 623 |  | 482
Gains (losses) on derivatives | 141 | 940 |
TBA Forward Pipelines Trades |  |  |
Derivative Notional Balance |  |  |
Notional balance | 1,210,000 |  | 0
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 5,538 |  | 0
Derivative liability, notional amount | 245,000 |  | 0
Derivative liability, fair value | (276) |  |
Gains (losses) on derivatives | 592 | 0 |
Interest Rate Swap |  |  |
Derivative Notional Balance |  |  |
Notional balance | 0 |  | 593,500
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 0 |  | 504
Derivative liability, notional amount | 952,500 |  | 0
Derivative liability, fair value | (8,236) |  | 0
Gains (losses) on derivatives | 0 | (9,564) |
Interest Rate Swap Futures And TBA Forward MBS Trades |  |  |
Fair value of derivative assets (liabilities) at: |  |  |
Gains (losses) on derivatives | (3,310) | 39,258 |
Forward Sales Of Reverse Loans |  |  |
Derivative Notional Balance |  |  |
Notional balance | 85,000 |  | 30,000
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 762 |  | 34
Derivative liability, notional amount | 55,000 |  | 20,000
Derivative liability, fair value | (341) |  | (84)
Gains (losses) on derivatives | 471 | (62) |
TBA forward MBS trades |  |  |
Fair value of derivative assets (liabilities) at: |  |  |
Derivative liability, notional amount | 1,210,000 |  | 400,000
Derivative liability, fair value | (11,227) |  | (4,554)
Other |  |  |
Derivative Notional Balance |  |  |
Notional balance | 0 |  | 0
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 0 |  | 2
Derivative liability, notional amount | 0 |  | 0
Derivative liability, fair value | (438) |  | $ 0
Gains (losses) on derivatives | $ (439) | $ (561) |

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