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Mortgage Servicing Rights - Schedule of Mortgage Servicing Rights (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Servicing Asset at Amortized Value, Balance [Roll Forward] |  |  |
Balance at end of year, net of valuation reserve | $ 28.3 | $ 31.1 |
Mortgage loans |  |  |
Servicing Asset at Amortized Value, Balance [Roll Forward] |  |  |
Servicing asset at amortized cost, before valuation reserve, beginning | 31.1 | 31.6 | $ 34.3
Originations of mortgage servicing rights | 1.1 | 2.5 | 3.7
Amortization expense | (3.9) | (4.3) | (6.4)
Servicing asset at amortized cost, before valuation reserve, ending | 28.3 | 31.1 | 31.6
Acquisition of mortgage servicing rights | 0.0 | 1.3 | 0.0
Less valuation reserve | 0.0 | 0.0 | (3.4)
Balance at end of year, net of valuation reserve | 28.3 | 31.1 | 28.2
Principal balance of serviced loans underlying mortgage servicing rights | $ 3,091.1 | $ 3,259.8 | $ 3,203.7
Mortgage servicing rights as a percentage of serviced loans | 0.0092 | 0.0095 | 0.0088

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- Definition Servicing Asset As a Percentage of Serviced Loans Held-In-Portfolio + References No definition available. + Details
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- Definition Servicing Asset at Amortized Cost, Before Valuation Reserve + References No definition available. + Details
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- Definition Servicing Asset at Amortized Cost, Acquisitions + References No definition available. + Details
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- Definition This is the result of the principal amount outstanding of total loans managed or securitized less securitized loans and loans that are in the process of being securitized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Subparagraph (a) -Paragraph 4 -SubTopic 20 -Topic 860 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-4 + Details
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- Definition Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481260/860-50-45-1 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481260/860-50-45-2 + Details
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- Definition Amount of additions from purchases, assumption or transfer to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-4 + Details
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- Definition Amount of amortization of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-4 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Reflects the estimated amount of impairment as of the balance sheet date of recognized servicing assets that are being amortized in proportion to and over the period of estimated net servicing income or loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (e)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-4 + Details
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