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Mortgage Servicing - Summary of Activity in Carrying Value of Amortization Method Servicing Assets (Footnote) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Cumulative effect of fair value election |  | $ 82,043 |  |
Retained Earnings (Accumulated Deficit) [Member] |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Cumulative effect of fair value election |  | 82,043 |  |
Mortgage Servicing Rights - Amortized Costs [Member] |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Valuation allowance of MSRs | [1],[2] | 24,788 | $ 3,366 | $ (10,813)
Mortgage Servicing Rights - Amortized Costs [Member] | Retained Earnings (Accumulated Deficit) [Member] |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Tax effect of adjustment on retained earnings |  | $ 6,800 |  |
Impaired Government Insured Stratum [Member] |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Valuation allowance of MSRs |  |  | $ 24,800 |
[1] | Effective January 1, 2018, we elected fair value accounting for our MSRs previously accounted for using the amortization method, which included Agency MSRs and government-insured MSRs. This irrevocable election applies to all subsequently acquired or originated servicing assets and liabilities that have characteristics consistent with each of these classes. We recorded a cumulative-effect adjustment of $82.0 million to retained earnings as of January 1, 2018 to reflect the excess of the fair value of the Agency MSRs over their carrying amount. We also recognized the tax effect of this adjustment through an increase in retained earnings of $6.8 million and a deferred tax asset for the same amount. However, we established a full valuation allowance on the resulting deferred tax asset through a reduction in retained earnings. The government-insured MSRs were impaired by $24.8 million at December 31, 2017; therefore, these MSRs were already effectively carried at fair value.
[2] | Impairment of MSRs is recognized in MSR valuation adjustments, net in the consolidated statements of operations for 2017 and 2016. Impairment valuation allowance balance of $24.8 million was reclassified to reduce the carrying value of the related MSRs on January 1, 2018 in connection with our fair value election. See Note 4 — Fair Value for additional information regarding impairment and the valuation allowance.

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- Definition Amount of increase (decrease) in the amortized amount from a decrease (increase) in the valuation allowance applied to the servicing asset for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 + Details
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