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Fair Value - Schedule of Fair Value Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Loans held for sale |  |  |  |  |  |  |
Loans held for sale, at fair value |  | $ 145,417 | [1] | $ 214,262 | $ 200,438 | [1] | $ 284,632
Financial liabilities: |  |  |  |  |  |  |
Match funded liabilities |  | 714,246 |  | 998,618 |  |  |
HMBS-related borrowings | [2] | 5,184,227 |  | 4,601,556 |  |  |
Financing liabilities: |  |  |  |  |  |  |
Other financing liabilities |  | 719,319 |  | 593,518 |  |  |
Total Financing liabilities |  | 5,903,546 |  | 5,195,074 |  |  |
Other secured borrowings: |  |  |  |  |  |  |
Total Other secured borrowings |  | 345,425 |  | 545,850 |  |  |
Senior Notes [Abstract] |  |  |  |  |  |  |
Senior notes, net |  | 347,749 |  | 347,338 |  |  |
Mortgage servicing rights |  |  |  |  |  |  |
Mortgage servicing rights, at fair value |  | 999,282 |  | 671,962 | $ 598,147 |  | $ 679,256
Total Mortgage servicing rights |  | 999,282 |  | 1,008,844 |  |  |
Carrying Value [Member] |  |  |  |  |  |  |
Loans held for sale |  |  |  |  |  |  |
Total Loans held for sale |  | 217,436 |  | 238,358 |  |  |
Loans held for investment |  | 5,307,560 |  | 4,715,831 |  |  |
Financing liabilities: |  |  |  |  |  |  |
Total Financing liabilities |  | 5,903,546 |  | 5,195,074 |  |  |
Other secured borrowings: |  |  |  |  |  |  |
Total Other secured borrowings |  | 345,425 |  | 545,850 |  |  |
Senior Notes [Abstract] |  |  |  |  |  |  |
Senior notes, net |  | 347,749 |  | 347,338 |  |  |
Mortgage servicing rights |  |  |  |  |  |  |
Total Mortgage servicing rights |  | 999,282 |  | 1,008,844 |  |  |
Fair Value [Member] |  |  |  |  |  |  |
Loans held for sale |  |  |  |  |  |  |
Total Loans held for sale |  | 217,436 |  | 238,358 |  |  |
Loans held for investment |  | 5,307,560 |  | 4,715,831 |  |  |
Financing liabilities: |  |  |  |  |  |  |
Total Financing liabilities |  | 5,889,053 |  | 5,175,049 |  |  |
Other secured borrowings: |  |  |  |  |  |  |
Total Other secured borrowings |  | 351,996 |  | 555,523 |  |  |
Senior Notes [Abstract] |  |  |  |  |  |  |
Senior notes, net |  | 355,161 |  | 358,422 |  |  |
Mortgage servicing rights |  |  |  |  |  |  |
Total Mortgage servicing rights |  | 999,282 |  | 1,090,707 |  |  |
Level 2 [Member] | Carrying Value [Member] |  |  |  |  |  |  |
Loans held for sale |  |  |  |  |  |  |
Loans held for sale, at fair value | [3] | 145,417 |  | 214,262 |  |  |
Other secured borrowings: |  |  |  |  |  |  |
Senior secured term loan | [4],[5] | 230,295 |  | 290,068 |  |  |
Senior Notes [Abstract] |  |  |  |  |  |  |
Senior unsecured notes | [4],[5] | 3,122 |  | 3,122 |  |  |
Senior secured notes | [4],[5] | 344,627 |  | 344,216 |  |  |
Derivative financial instruments assets (liabilities): |  |  |  |  |  |  |
Interest rate lock commitments | [3] | 2,816 |  | 3,283 |  |  |
Level 2 [Member] | Fair Value [Member] |  |  |  |  |  |  |
Loans held for sale |  |  |  |  |  |  |
Loans held for sale, at fair value | [3] | 145,417 |  | 214,262 |  |  |
Other secured borrowings: |  |  |  |  |  |  |
Senior secured term loan | [4],[5] | 236,866 |  | 299,741 |  |  |
Senior Notes [Abstract] |  |  |  |  |  |  |
Senior unsecured notes | [4],[5] | 3,090 |  | 2,872 |  |  |
Senior secured notes | [4],[5] | 352,071 |  | 355,550 |  |  |
Derivative financial instruments assets (liabilities): |  |  |  |  |  |  |
Interest rate lock commitments | [3] | 2,816 |  | 3,283 |  |  |
Level 3 [Member] | Carrying Value [Member] |  |  |  |  |  |  |
Loans held for sale |  |  |  |  |  |  |
Loans held for sale, at lower of cost or fair value | [6] | 72,019 |  | 24,096 |  |  |
Loans held for investment | [3] | 5,279,187 |  | 4,715,831 |  |  |
Advances (including match funded) | [4] | 1,101,104 |  | 1,356,393 |  |  |
Automotive dealer financing notes (including match funded) | [4] | 0 |  | 32,757 |  |  |
Receivables, net | [4] | 155,937 |  | 199,529 |  |  |
Mortgage-backed securities, at fair value | [3] | 1,670 |  | 1,592 |  |  |
Financial liabilities: |  |  |  |  |  |  |
Match funded liabilities | [4] | 714,246 |  | 998,618 |  |  |
HMBS-related borrowings | [3] | 5,184,227 |  | 4,601,556 |  |  |
Other secured borrowings: |  |  |  |  |  |  |
Other | [4] | 115,130 |  | 255,782 |  |  |
Derivative financial instruments assets (liabilities): |  |  |  |  |  |  |
Interest rate caps | [3] | 1,211 |  | 2,056 |  |  |
Mortgage servicing rights |  |  |  |  |  |  |
Mortgage servicing rights, at fair value | [3] | 999,282 |  | 671,962 |  |  |
Mortgage servicing rights, at amortized cost | [4],[7] | 0 |  | 336,882 |  |  |
Level 3 [Member] | Fair Value [Member] |  |  |  |  |  |  |
Loans held for sale |  |  |  |  |  |  |
Loans held for sale, at lower of cost or fair value | [6] | 72,019 |  | 24,096 |  |  |
Loans held for investment | [3] | 5,279,187 |  | 4,715,831 |  |  |
Advances (including match funded) | [4] | 1,101,104 |  | 1,356,393 |  |  |
Automotive dealer financing notes (including match funded) | [4] | 0 |  | 32,590 |  |  |
Receivables, net | [4] | 155,937 |  | 199,529 |  |  |
Mortgage-backed securities, at fair value | [3] | 1,670 |  | 1,592 |  |  |
Financial liabilities: |  |  |  |  |  |  |
Match funded liabilities | [4] | 710,303 |  | 992,698 |  |  |
HMBS-related borrowings | [3] | 5,184,227 |  | 4,601,556 |  |  |
Other secured borrowings: |  |  |  |  |  |  |
Other | [4] | 115,130 |  | 255,782 |  |  |
Derivative financial instruments assets (liabilities): |  |  |  |  |  |  |
Interest rate caps | [3] | 1,211 |  | 2,056 |  |  |
Mortgage servicing rights |  |  |  |  |  |  |
Mortgage servicing rights, at fair value | [3] | 999,282 |  | 671,962 |  |  |
Mortgage servicing rights, at amortized cost | [4],[7] | 0 |  | 418,745 |  |  |
Level 1 [Member] | Carrying Value [Member] |  |  |  |  |  |  |
Loans held for sale |  |  |  |  |  |  |
U.S. Treasury notes | [3] | 1,059 |  | 1,567 |  |  |
Derivative financial instruments assets (liabilities): |  |  |  |  |  |  |
Forward mortgage-backed securities | [3] | (1,873) |  | (545) |  |  |
Level 1 [Member] | Fair Value [Member] |  |  |  |  |  |  |
Loans held for sale |  |  |  |  |  |  |
U.S. Treasury notes | [3] | 1,059 |  | 1,567 |  |  |
Derivative financial instruments assets (liabilities): |  |  |  |  |  |  |
Forward mortgage-backed securities | [3] | (1,873) |  | (545) |  |  |
Loans Held for Investment Securitization Trusts [Member] | Level 3 [Member] | Carrying Value [Member] |  |  |  |  |  |  |
Loans held for sale |  |  |  |  |  |  |
Loans held for investment | [3] | 28,373 |  | 0 |  |  |
Loans Held for Investment Securitization Trusts [Member] | Level 3 [Member] | Fair Value [Member] |  |  |  |  |  |  |
Loans held for sale |  |  |  |  |  |  |
Loans held for investment | [3] | 28,373 |  | 0 |  |  |
Financing Liability - MSRs Pledged [Member] | Level 3 [Member] | Carrying Value [Member] |  |  |  |  |  |  |
Financing liabilities: |  |  |  |  |  |  |
Other financing liabilities | [3] | 620,199 |  | 508,291 |  |  |
Financing Liability - MSRs Pledged [Member] | Level 3 [Member] | Fair Value [Member] |  |  |  |  |  |  |
Financing liabilities: |  |  |  |  |  |  |
Other financing liabilities | [3] | 620,199 |  | 508,291 |  |  |
Financing Liability Owed to Securitization Investors [Member] | Level 3 [Member] | Carrying Value [Member] |  |  |  |  |  |  |
Financing liabilities: |  |  |  |  |  |  |
Other financing liabilities | [3] | 26,643 |  | 0 |  |  |
Financing Liability Owed to Securitization Investors [Member] | Level 3 [Member] | Fair Value [Member] |  |  |  |  |  |  |
Financing liabilities: |  |  |  |  |  |  |
Other financing liabilities | [3] | 26,643 |  | 0 |  |  |
Other Financing Liabilities [Member] | Level 3 [Member] | Carrying Value [Member] |  |  |  |  |  |  |
Financing liabilities: |  |  |  |  |  |  |
Other financing liabilities | [4] | 72,477 |  | 85,227 |  |  |
Other Financing Liabilities [Member] | Level 3 [Member] | Fair Value [Member] |  |  |  |  |  |  |
Financing liabilities: |  |  |  |  |  |  |
Other financing liabilities | [4] | $ 57,984 |  | $ 65,202 |  |  |
[1] | At September 30, 2018 and 2017, the balances include $(6.5) million and $6.7 million, respectively, of fair value adjustments.
[2] | Represents amounts due to the holders of beneficial interests in Ginnie Mae guaranteed HMBS. The beneficial interests have no maturity dates, and the borrowings mature as the related loans are repaid.
[3] | Measured at fair value on a recurring basis.
[4] | Disclosed, but not carried, at fair value.
[5] | The carrying values are net of unamortized debt issuance costs and discount. See Note 11 – Borrowings for additional information.
[6] | Measured at fair value on a non-recurring basis.
[7] | 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. The balance at December 31, 2017 includes the impaired government-insured stratum of amortization method MSRs, which was measured at fair value on a non-recurring basis and reported net of the valuation allowance. At December 31, 2017, the carrying value of this stratum was $158.0 million before applying the valuation allowance of $24.8 million.

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents advances and match funded advances. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of forward mortgage-backed securities trades, which provides economic hedge against those changes in fair value on mortgage loans from the date of closing loans with borrowers to the date till those loans are sold in secondary market. + References No definition available. + Details
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- Definition This represents the amount of liability which is a resultant of reverse mortgage loans sold into the secondary with servicing rights retained. As the transfer of these loans do not meet the definition of participating interest because of the servicing requirement that requires the issuer to absorb some level of risk, these transfers are accounted for as financing. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents loans held-for-sale at lower cost of fair value as presented on the statement of financial position which may include mortgage loans held-for-sale, finance receivables held-for-sale, or any other loans classified as held-for-sale which are due the Company as of the balance sheet date. + References No definition available. + Details
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- Definition This element represents the home equity conversion mortgages insured by FHA. + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The fair value as of the balance sheet date of firm holdings in debt obligations issued by the US government including short-term Treasury bills, medium-term Treasury notes, and long-term Treasury bonds, as well as debt issued by agencies. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative assets, net of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 + Details
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- Definition Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables. + References No definition available. + Details
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- Definition Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale. + References No definition available. + Details
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- Definition Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Fair value portion of receivables, including, but not limited to, trade account receivables, note receivables, and loan receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13728-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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