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Mortgage Servicing Rights - Quantitative Assumptions Used for MSRs (Details) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Dec. 31, 2017
Minimum |  |
Quantitative assumptions used in determining lower of cost or fair value of MSRs |  |
Conditional prepayment rate (as a percent) | 7.72% | 8.53%
Life (of the MSR) | 3 years 3 months 4 days | 3 years 3 months 15 days
Weighted-average coupon rate (as a percent) | 3.96% | 3.97%
Discount rate (as a percent) | 10.50% | 10.50%
Maximum |  |
Quantitative assumptions used in determining lower of cost or fair value of MSRs |  |
Conditional prepayment rate (as a percent) | 20.28% | 19.63%
Life (of the MSR) | 7 years 11 months 23 days | 7 years 1 month 24 days
Weighted-average coupon rate (as a percent) | 6.75% | 6.79%
Discount rate (as a percent) | 10.50% | 10.52%
Weighted Average |  |
Quantitative assumptions used in determining lower of cost or fair value of MSRs |  |
Conditional prepayment rate (as a percent) | 8.13% | 9.04%
Life (of the MSR) | 7 years 3 months 22 days | 6 years 9 months 4 days
Weighted-average coupon rate (as a percent) | 4.02% | 4.04%
Discount rate (as a percent) | 10.50% | 10.50%

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- Definition Weighted average coupon rate used to estimate the fair value of servicing assets and servicing liabilities. + References No definition available. + Details
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- Definition Discount rate used to estimate the fair value of servicing assets and servicing liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=68078379&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=68078379&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=68078379&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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