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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Fair value of derivative assets (liabilities) at: |  |  |  |  |
Derivatives, at fair value | $ 9,051 |  | $ 9,051 |  | $ 9,279
Gains (losses) on derivatives during the six months ended: |  |  |  |  |
Gains (losses) on derivatives | (328) | $ (584) | 31 | $ (2,080) |
Interest Rate Lock Commitments [Member] |  |  |  |  |
Derivative Notional Balance |  |  |  |  |
Notional balance at December 31, 2016 |  |  | 360,450 |  |
Additions |  |  | 2,478,110 |  |
Amortization |  |  | 0 |  |
Maturities |  |  | (2,117,572) |  |
Terminations |  |  | (475,410) |  |
Notional balance at June 30, 2017 | 245,578 |  | $ 245,578 |  |
Maturity |  |  | Jul. 2017 - Sep. 2017 |  |
Fair value of derivative assets (liabilities) at: |  |  |  |  |
Derivatives, at fair value | 5,352 |  | $ 5,352 |  | 6,507
Gains (losses) on derivatives during the six months ended: |  |  |  |  |
Gains (losses) on derivatives |  |  | (1,428) | 6,672 |
Forward MBS Trades [Member] |  |  |  |  |
Derivative Notional Balance |  |  |  |  |
Notional balance at December 31, 2016 |  |  | 609,177 |  |
Additions |  |  | 1,802,148 |  |
Amortization |  |  | 0 |  |
Maturities |  |  | (1,025,320) |  |
Terminations |  |  | (993,409) |  |
Notional balance at June 30, 2017 | 392,596 |  | $ 392,596 |  |
Maturity |  |  | Aug. 2017 |  |
Fair value of derivative assets (liabilities) at: |  |  |  |  |
Derivatives, at fair value | 1,752 |  | $ 1,752 |  | (614)
Gains (losses) on derivatives during the six months ended: |  |  |  |  |
Gains (losses) on derivatives |  |  | (6,184) | $ (21,626) |
Interest Rate Caps [Member] |  |  |  |  |
Derivative Notional Balance |  |  |  |  |
Notional balance at December 31, 2016 |  |  | 955,000 |  |
Additions |  |  | 110,000 |  |
Amortization |  |  | (180,000) |  |
Maturities |  |  | 0 |  |
Terminations |  |  | (160,000) |  |
Notional balance at June 30, 2017 | 725,000 |  | $ 725,000 |  |
Maturity |  |  | Oct. 2017 - May 2019 |  |
Fair value of derivative assets (liabilities) at: |  |  |  |  |
Derivatives, at fair value | $ 1,937 |  | $ 1,937 |  | $ 1,836
Gains (losses) on derivatives during the six months ended: |  |  |  |  |
Gains (losses) on derivatives |  |  | $ 31 |  |

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