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Fair Value of Financial Instruments - Market Valuation Adjustments, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Mortgage servicing rights income (loss), net | $ 7,860 | $ 14,353 | $ (3,922)
Total Market Valuation Gains (Losses), Net | 51,484 | (12,917) | (51,975)
Mortgage Banking Activities, Net |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Changes in fair value of assets | 51,844 | 36,445 | 6,482
Mortgage Banking Activities, Net | Residential Loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Changes in fair value of assets | 31,493 | 5,786 | 3,712
Mortgage Banking Activities, Net | Loan purchase commitments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Changes in fair value of assets | 37,880 | 25,613 | 50,234
Mortgage Banking Activities, Net | Commercial loans, at fair value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Changes in fair value of assets | 0 | 433 | 10,265
Mortgage Banking Activities, Net | Sequoia securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Changes in fair value of assets | 0 | 1,455 | (15,261)
Mortgage Banking Activities, Net | Risk management derivatives, net |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Changes in fair value of assets | (17,529) | 3,158 | (42,468)
Investment Fair Value Changes, Net |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Changes in fair value of assets | 10,374 | (28,574) | (21,357)
Investment Fair Value Changes, Net | Risk management derivatives, net |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Changes in fair value of assets | (12,842) | (9,112) | (9,677)
Investment Fair Value Changes, Net | Residential loans, held-for-investment |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Changes in fair value of assets | (5,765) | (23,102) | (6,337)
Investment Fair Value Changes, Net | Trading securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Changes in fair value of assets | 39,526 | 9,666 | (2,019)
Investment Fair Value Changes, Net | Valuation adjustments on commercial loans held-for-sale |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Changes in fair value of assets | 300 | (307) | 0
Investment Fair Value Changes, Net | Legacy Sequoia |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Changes in fair value of assets | (8,027) | (4,200) | (1,192)
Investment Fair Value Changes, Net | Sequoia Choice |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Changes in fair value of assets | (323) | 0 | 0
Investment Fair Value Changes, Net | Risk-sharing investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Changes in fair value of assets | (1,484) | (1,151) | (1,886)
Investment Fair Value Changes, Net | Impairments on AFS securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Changes in fair value of assets | (1,011) | (368) | (246)
MSR Income (Loss), Net |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Mortgage servicing rights income (loss), net | (10,734) | (20,788) | (37,100)
MSR Income (Loss), Net | Risk management derivatives, net |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Mortgage servicing rights income (loss), net | (568) | 15,584 | (12,708)
MSR Income (Loss), Net | MSRs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Mortgage servicing rights income (loss), net | $ (10,166) | $ (36,372) | $ (24,392)

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- Definition The aggregate net change in market value for certain assets and liabilities that was included in earnings for the period. This includes changes in market values for assets and liabilities accounted for at fair value, as well as the credit portion of other-than-temporary impairments on securities available for sale, impairments on loans held-for-sale and real estate owned. + References No definition available. + Details
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