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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, 2023 | Dec. 31, 2022
Minimum |  |
Quantitative assumptions used in determining lower of cost or fair value of MSRs |  |
Conditional prepayment rate (as a percent) | 6.89% | 7.02%
Life in years (of the MSR) | 4 years 3 months 3 days | 3 years 4 months 6 days
Weighted-average coupon rate (as a percent) | 3.57% | 3.55%
Discount rate (as a percent) | 10.36% | 10.41%
Maximum |  |
Quantitative assumptions used in determining lower of cost or fair value of MSRs |  |
Conditional prepayment rate (as a percent) | 11.27% | 13.58%
Life in years (of the MSR) | 7 years 3 months | 7 years 4 months 13 days
Weighted-average coupon rate (as a percent) | 5.84% | 6.24%
Discount rate (as a percent) | 10.55% | 10.54%
Weighted Average |  |
Quantitative assumptions used in determining lower of cost or fair value of MSRs |  |
Conditional prepayment rate (as a percent) | 7.02% | 7.11%
Life in years (of the MSR) | 7 years 1 month 9 days | 7 years 2 months 12 days
Weighted-average coupon rate (as a percent) | 3.70% | 3.68%
Discount rate (as a percent) | 10.52% | 10.51%

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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/exampleRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-2 + 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/exampleRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-2 + 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/2009/role/commonPracticeRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-2 + Details
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