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Mortgage Servicing Rights, Net - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
Mortgage Servicing Rights |  |  |
Mortgage servicing rights, net | $ 508,100 | $ 517,579 |
Special servicing portfolio | 1,700,000 | 2,500,000 |
Primary Servicing Portfolio |  |  |
Mortgage Servicing Rights |  |  |
Mortgage servicing rights, net | 71,700,000 | 67,400,000 |
Limited Servicing Portfolio, Loans With Mortgage Servicing Rights |  |  |
Mortgage Servicing Rights |  |  |
Mortgage servicing rights, net | 4,300,000 | 6,500,000 |
Discount Rate One |  |  |
Mortgage Servicing Rights |  |  |
Decrease in fair value of servicing rights | 15,700 | 16,600 |
Discount Rate Two |  |  |
Mortgage Servicing Rights |  |  |
Decrease in fair value of servicing rights | $ 30,700 | $ 32,500 |
Minimum |  |  |
Mortgage Servicing Rights |  |  |
Discount rates used in measuring fair value | 6.10% | 6.10% |
Minimum | Discount Rate One |  |  |
Mortgage Servicing Rights |  |  |
Increase in discount rate | 1.00% | 1.00% |
Maximum |  |  |
Mortgage Servicing Rights |  |  |
Discount rates used in measuring fair value | 13.50% | 13.50% |
Maximum | Discount Rate Two |  |  |
Mortgage Servicing Rights |  |  |
Increase in discount rate | 2.00% | 2.00% |
Mortgage Servicing Rights |  |  |
Mortgage Servicing Rights |  |  |
Mortgage servicing rights, net | $ 508,100 |  | $ 506,962
Estimated fair value of MSRs | $ 647,400 | $ 658,100 |

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- Definition Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481260/860-50-45-2 + Details
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