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Mortgage Servicing Rights, Net - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Mortgage Servicing Rights |  |  |
Primary servicing portfolio | $ 68,400.0 |  | $ 69,000.0
Special servicing portfolio | 1,700.0 |  |
Discount Rate One |  |  |
Mortgage Servicing Rights |  |  |
Decrease in fair value of servicing rights | 17.8 |  | 18.3
Discount Rate Two |  |  |
Mortgage Servicing Rights |  |  |
Decrease in fair value of servicing rights | $ 34.8 |  | $ 35.7
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 |  |  |
Estimated fair value of MSRs | $ 661.9 |  | $ 667.6

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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128311188&loc=d3e122625-111746 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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