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Mortgage Servicing Rights - Data and Key Economic Assumptions Related to the Company's MRSs (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Dec. 31, 2020
Data and key economic assumptions related to mortgage servicing rights |  |
Unpaid principal balance | $ 8,470,973 | $ 7,322,671
Weighted-average prepayment speed (CPR) | 11.68% | 15.05%
Estimated impact of a 10% increase | $ (4,258) | $ (4,001)
Estimated impact of a 20% increase | $ (8,254) | $ (7,674)
Discount rate | 9.83% | 9.86%
Estimated impact of a 10% increase | $ (3,381) | $ (2,144)
Estimated impact of a 20% increase | $ (6,520) | $ (4,144)
Weighted-average coupon interest rate | 3.33% | 3.58%
Weighted-average servicing fee (basis points) | 30.52% | 29.94%
Weighted-average remaining maturity (in years) | 6 years 2 months 23 days | 5 years 1 month 20 days

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- Definition Value assumptions used to estimate fair value unpaid principle balance. + References No definition available. + Details
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- Definition Servicing assets and servicing liabilities at fair value assumptions used to estimate fair value weighted average coupon interest rate. + References No definition available. + Details
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- Definition Servicing assets and servicing liabilities at fair value assumptions used to estimate fair value weighted average remaining maturity. + References No definition available. + Details
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- Definition Servicing assets and servicing liabilities at fair value assumptions used to estimate fair value weighted average servicing fee. + References No definition available. + Details
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- Definition The hypothetical financial impact of a 10 percent adverse change of the discount rate on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + Details
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- Definition The hypothetical financial impact of a 10 percent adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + Details
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- Definition The hypothetical financial impact of a 20 percent adverse change of the discount rate on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + Details
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- Definition The hypothetical financial impact of a 20 percent adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121570589&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://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122596-111746 + Details
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