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Mortgage Servicing Rights ("MSRs") and Related Liabilities - Fair Value Assumptions (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Mortgage servicing rights |  |
Assumption for Fair Value of Mortgage Servicing Rights |  |
Discount rate | 9.70% | 10.20%
Prepayment speeds | 13.90% | 10.80%
Average life | 5 years 7 months | 6 years 8 months
Mortgage servicing rights | Credit sensitive |  |
Assumption for Fair Value of Mortgage Servicing Rights |  |
Discount rate | 10.40% | 11.30%
Prepayment speeds | 13.20% | 11.80%
Average life | 5 years 10 months 8 days | 6 years 5 months
Mortgage servicing rights | Interest sensitive |  |
Assumption for Fair Value of Mortgage Servicing Rights |  |
Discount rate | 9.00% | 9.30%
Prepayment speeds | 14.60% | 10.00%
Average life | 5 years 5 months | 7 years
Excess spread financing | Weighted-average |  |
Assumption for Fair Value of Mortgage Servicing Rights |  |
Discount rate | 11.90% | 10.40%
Prepayment speeds | 13.30% | 11.00%
Recapture rate | 22.30% | 18.60%
Average life | 5 years 8 months | 6 years 6 months
MSR Financing Liability | Financing rates |  |
Assumption for Fair Value of Mortgage Servicing Rights |  |
Advance financing rates | 3.70% | 4.20%
MSR Financing Liability | Recovery rates |  |
Assumption for Fair Value of Mortgage Servicing Rights |  |
Annual advance recovery rates | 18.70% | 19.00%

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- Definition Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Expected weighted-average life + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Weighted average life of securitized assets regardless of when the transfer occurred, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=118948506&loc=d3e107314-111719 + Details
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- Definition Discount rate which is used to value residual cash flows generated by financial assets of a securitization, asset-backed financing arrangement, or similar transfer regardless of when the transfer occurred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118948506&loc=d3e107314-111719 + Details
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- Definition Estimated rate of prepayment of principal on financial assets regardless of when the transfer occurred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=118948506&loc=d3e107314-111719 + Details
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- Definition Discount rate used to estimate the fair value of servicing assets and servicing liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122596-111746 + Details
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- Definition Estimated rate of prepayments of principal on servicing assets and servicing liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122596-111746 + Details
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