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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 1,254,905 | $ 1,472,566
Fair value of derivative assets (liabilities) at: |  |
Derivatives, at fair value | 23,246 | 6,007
Derivative Liability, Notional Amount | 420,000 | 47,083
Derivative Liability, Fair Value, Gross Liability | (4,638) | (100)
Gain (loss) on derivatives, net | 35,270 | (1,132)
Forward Sales Of Reverse Loans |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 30,000 | 40,000
Fair value of derivative assets (liabilities) at: |  |
Derivatives, at fair value | 34 | 8
Derivative Liability, Notional Amount | 20,000 | 20,000
Derivative Liability, Fair Value, Gross Liability | (84) | (29)
Gain (loss) on derivatives, net | (29) | 91
Forward loans IRLCs |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 619,713 | 204,020
Fair value of derivative assets (liabilities) at: |  |
Derivatives, at fair value | 22,224 | 4,745
Gain (loss) on derivatives, net | 17,479 | 756
TBA forward MBS trades |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 0 | 1,200,000
Fair value of derivative assets (liabilities) at: |  |
Derivatives, at fair value | 0 | 1,121
Derivative Liability, Notional Amount | 400,000 | 0
Derivative Liability, Fair Value, Gross Liability | (4,554) | 0
Forward LHFS Trades |  |
Fair value of derivative assets (liabilities) at: |  |
Gain (loss) on derivatives, net | 0 | (3,833)
Interest Rate Swap |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 593,500 | 0
Fair value of derivative assets (liabilities) at: |  |
Derivatives, at fair value | 504 | 0
Gain (loss) on derivatives, net | (10,140) | 471
Interest Rate Swap Futures And TBA Forward MBS Trades |  |
Fair value of derivative assets (liabilities) at: |  |
Gain (loss) on derivatives, net | 27,538 | 525
Interest Rate Caps |  |
Fair value of derivative assets (liabilities) at: |  |
Derivative Liability, Notional Amount | 0 | 27,083
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Gain (loss) on derivatives, net | 0 | (358)
Derivative |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 0 | 0
Fair value of derivative assets (liabilities) at: |  |
Derivatives, at fair value | 2 | 0
Derivative Liability, Notional Amount | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | (71)
Gain (loss) on derivatives, net | 73 | 673
Reverse Mortgage Loan Interest Rate Lock Commitments |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 11,692 | 28,546
Fair value of derivative assets (liabilities) at: |  |
Derivatives, at fair value | 482 | 133
Gain (loss) on derivatives, net | $ 349 | $ 543

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