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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | $ 22,852,000 |  | $ 6,007,000
Interest Rate Lock Commitments |  |  |
Derivative Notional Balance |  |  |
Notional balance | 507,632,000 |  | 232,566,000
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 17,818,000 |  | 4,878,000
Gains (losses) on derivatives during the six months ended: |  |  |
Gains (losses) on derivatives | 12,048,000 | $ (296,000) |
TBA/Forward Mortgage Backed Securities Trades |  |  |
Derivative Notional Balance |  |  |
Notional balance | 395,000,000 |  | 1,200,000,000
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 5,019,000 |  | 1,121,000
Gains (losses) on derivatives during the six months ended: |  |  |
Gains (losses) on derivatives | 42,811,000 | 0 |
Forward MBS Trades |  |  |
Derivative Notional Balance |  |  |
Notional balance | 80,000,000 |  | 60,000,000
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | (1,017,000) |  | (92,000)
Gains (losses) on derivatives during the six months ended: |  |  |
Gains (losses) on derivatives | (10,320,000) | (3,238,000) |
Gains on derivatives | 700,000 |  |
Interest Rate Caps |  |  |
Derivative Notional Balance |  |  |
Notional balance | 0 |  | 27,083,000
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 0 |  | 0
Gains (losses) on derivatives during the six months ended: |  |  |
Gains (losses) on derivatives | 0 | $ (335,000) |
Interest Rate Swap |  |  |
Derivative Notional Balance |  |  |
Notional balance | 395,000,000.0 |  |
Fair value of derivative assets (liabilities) at: |  |  |
Derivatives, at fair value | 5,000,000.0 |  | $ 0
Reverse Mortgage Loan Interest Rate Lock Commitments |  |  |
Gains (losses) on derivatives during the six months ended: |  |  |
Short-term commitments to lend | $ 30,200,000 |  |

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