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Mortgage Servicing Rights - Quantitative Assumptions Used for MSRs (Details) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2019 | Dec. 31, 2018
Minimum |  |
Quantitative assumptions used in determining lower of cost or fair value of MSRs |  |
Conditional prepayment rate (as a percent) | 12.41% | 7.86%
Life in years (of the MSR) | 2 years 1 month 17 days | 3 years 5 months 4 days
Weighted-average coupon rate (as a percent) | 3.97% | 3.97%
Discount rate (as a percent) | 10.00% | 10.00%
Maximum |  |
Quantitative assumptions used in determining lower of cost or fair value of MSRs |  |
Conditional prepayment rate (as a percent) | 21.77% | 19.26%
Life in years (of the MSR) | 5 years 9 months 14 days | 7 years 8 months 4 days
Weighted-average coupon rate (as a percent) | 7.31% | 6.70%
Discount rate (as a percent) | 10.01% | 10.02%
Weighted Average |  |
Quantitative assumptions used in determining lower of cost or fair value of MSRs |  |
Conditional prepayment rate (as a percent) | 12.61% | 8.31%
Life in years (of the MSR) | 5 years 6 months 3 days | 7 years 2 months 8 days
Weighted-average coupon rate (as a percent) | 4.02% | 4.02%
Discount rate (as a percent) | 10.00% | 10.00%

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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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- Definition Weighted average life of financial assets and financial liabilities, 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 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122596-111746 + 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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