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Fair Value - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments and Nonfinancial Assets Measured at Fair Value on a Recurring or Non-recurring basis or Disclosed, but not Carried, at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Financial assets: |  |  |  |
Loans held for sale, at fair value | $ 366,364 | $ 208,752 | $ 176,525 | $ 214,262
Financial liabilities: |  |  |  |
Advance match funded liabilities (related to VIEs) | 581,288 | 679,109 |  |
Financing liabilities: |  |  |  |
HMBS-related borrowings | 6,772,711 | 6,063,435 | 5,380,448 | 4,601,556
Other financing liabilities | 576,722 | 972,595 |  |
Other secured borrowings: |  |  |  |
Total Other secured borrowings | 1,069,161 | 1,025,791 |  |
Senior notes: |  |  |  |
Total Senior notes | 311,898 | 311,085 |  |
Mortgage servicing rights: |  |  |  |
MSRs | 1,294,817 | 1,486,395 | 1,457,149 | $ 671,962
Financing Liability - MSRs Pledged |  |  |  |
Financing liabilities: |  |  |  |
Other financing liabilities | 566,952 | 950,593 | $ 1,032,856 |
Carrying Value |  |  |  |
Financial assets: |  |  |  |
Total Loans held for sale | 387,836 | 275,269 |  |
Loans held for investment | 7,006,897 | 6,292,938 |  |
Financing liabilities: |  |  |  |
Total Financing liabilities | 7,349,433 | 7,036,030 |  |
Other secured borrowings: |  |  |  |
Total Other secured borrowings | 1,069,161 | 1,025,791 |  |
Senior notes: |  |  |  |
Total Senior notes | 311,898 | 311,085 |  |
Fair Value |  |  |  |
Financial assets: |  |  |  |
Total Loans held for sale | 387,836 | 275,269 |  |
Loans held for investment | 7,006,897 | 6,292,938 |  |
Financing liabilities: |  |  |  |
Total Financing liabilities | 7,349,433 | 7,036,030 |  |
Other secured borrowings: |  |  |  |
Total Other secured borrowings | 1,043,212 | 1,010,789 |  |
Senior notes: |  |  |  |
Total Senior notes | 320,879 | 270,022 |  |
Level 2 | Carrying Value |  |  |  |
Financial assets: |  |  |  |
Loans held for sale, at fair value | 366,364 | 208,752 |  |
Corporate bonds | 211 | 441 |  |
Other secured borrowings: |  |  |  |
Senior secured term loan | 179,776 | 322,758 |  |
Senior notes: |  |  |  |
Senior unsecured notes | 21,357 | 21,046 |  |
Senior secured notes | 290,541 | 290,039 |  |
Derivative financial instrument assets (liabilities), at fair value |  |  |  |
Interest rate lock commitments |  | 4,878 |  |
Level 2 | Fair Value |  |  |  |
Financial assets: |  |  |  |
Loans held for sale, at fair value | 366,364 | 208,752 |  |
Corporate bonds | 211 | 441 |  |
Other secured borrowings: |  |  |  |
Senior secured term loan | 184,639 | 324,643 |  |
Senior notes: |  |  |  |
Senior unsecured notes | 20,625 | 13,821 |  |
Senior secured notes | 300,254 | 256,201 |  |
Derivative financial instrument assets (liabilities), at fair value |  |  |  |
Interest rate lock commitments |  | 4,878 |  |
Level 3 | Carrying Value |  |  |  |
Financial assets: |  |  |  |
Loans held for sale, at lower of cost or fair value | 21,472 | 66,517 |  |
Loans held for investment | 6,997,127 | 6,269,596 |  |
Advances (including match funded) | 828,239 | 1,056,523 |  |
Receivables, net | 187,665 | 201,220 |  |
Mortgage-backed securities, at fair value | 2,019 | 2,075 |  |
Financial liabilities: |  |  |  |
Advance match funded liabilities (related to VIEs) | 581,288 | 679,109 |  |
Financing liabilities: |  |  |  |
HMBS-related borrowings | 6,772,711 | 6,063,435 |  |
Other secured borrowings: |  |  |  |
Other | 889,385 | 703,033 |  |
Mortgage servicing rights: |  |  |  |
MSRs | 1,294,817 | 1,486,395 |  |
Level 3 | Carrying Value | Loans Held for Investments - Restricted for Securitization Investors |  |  |  |
Financial assets: |  |  |  |
Loans held for investment | 9,770 | 23,342 |  |
Level 3 | Carrying Value | Financing Liability - MSRs Pledged |  |  |  |
Financing liabilities: |  |  |  |
Other financing liabilities | 566,952 | 950,593 |  |
Level 3 | Carrying Value | Financing Liability Owed to Securitization Investors |  |  |  |
Financing liabilities: |  |  |  |
Other financing liabilities | 9,770 | 22,002 |  |
Level 3 | Fair Value |  |  |  |
Financial assets: |  |  |  |
Loans held for sale, at lower of cost or fair value | 21,472 | 66,517 |  |
Loans held for investment | 6,997,127 | 6,269,596 |  |
Advances (including match funded) | 828,239 | 1,056,523 |  |
Receivables, net | 187,665 | 201,220 |  |
Mortgage-backed securities, at fair value | 2,019 | 2,075 |  |
Financial liabilities: |  |  |  |
Advance match funded liabilities (related to VIEs) | 581,997 | 679,507 |  |
Financing liabilities: |  |  |  |
HMBS-related borrowings | 6,772,711 | 6,063,435 |  |
Other secured borrowings: |  |  |  |
Other | 858,573 | 686,146 |  |
Derivative financial instrument assets (liabilities), at fair value |  |  |  |
Interest rate lock commitments | 22,706 |  |  |
Mortgage servicing rights: |  |  |  |
MSRs | 1,294,817 | 1,486,395 |  |
Level 3 | Fair Value | Loans Held for Investments - Restricted for Securitization Investors |  |  |  |
Financial assets: |  |  |  |
Loans held for investment | 9,770 | 23,342 |  |
Level 3 | Fair Value | Financing Liability - MSRs Pledged |  |  |  |
Financing liabilities: |  |  |  |
Other financing liabilities | 566,952 | 950,593 |  |
Level 3 | Fair Value | Financing Liability Owed to Securitization Investors |  |  |  |
Financing liabilities: |  |  |  |
Other financing liabilities | 9,770 | 22,002 |  |
Level 1 | Carrying Value |  |  |  |
Derivative financial instrument assets (liabilities), at fair value |  |  |  |
Forward mortgage-backed securities trades |  | (21) |  |
TBA / Forward mortgage-backed securities (MBS) trades - MSR hedging |  | 1,121 |  |
Derivatives futures |  | 0 |  |
Level 1 | Fair Value |  |  |  |
Derivative financial instrument assets (liabilities), at fair value |  |  |  |
Forward mortgage-backed securities trades | 50 | (21) |  |
TBA / Forward mortgage-backed securities (MBS) trades - MSR hedging | (4,554) | 1,121 |  |
Derivatives futures | $ 504 | $ 0 |  |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fair value of firm holdings in corporate fixed income securities. Includes pledged and unpledged holdings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 No definition available. + 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 mortgage loans held-for-sale. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&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://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13728-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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=120400017&loc=d3e572229-122910 + 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://fasb.org/us-gaap/role/ref/legacyRef -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=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of collateralized debt obligations classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + 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://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, 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). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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- Definition Carrying amount of liabilities associated with financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120400017&loc=d3e572229-122910 + Details
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