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Mortgage Servicing Rights (Tables) | 12 Months Ended
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Dec. 31, 2020
Transfers and Servicing [Abstract] |
Schedule of Servicing Assets at Amortized Value | Information with respect to the Company’s mortgage servicing rights follows:
Year Ended December 31, | 2020 |  | 2019 |  | 2018
Balance at beginning of year | $ | 30.6 |  |  | $ | 27.7 |  |  | $ | 24.8 |
Originations of mortgage servicing rights | 11.7 |  |  | 7.3 |  |  | 6.0 |
Amortization expense | (8.0) |  |  | (4.4) |  |  | (3.1) |
Balance at end of year | 34.3 |  |  | 30.6 |  |  | 27.7 |
Less valuation reserve | (10.3) |  |  | (0.4) |  |  | — |
Balance at end of year, net of valuation reserve | $ | 24.0 |  |  | $ | 30.2 |  |  | $ | 27.7 |
Principal balance of serviced loans underlying mortgage servicing rights | $ | 3,585.5 |  |  | $ | 3,710.1 |  |  | $ | 3,698.2 |
Mortgage servicing rights as a percentage of serviced loans | 0.67 | % |  | 0.81 | % |  | 0.75 | %

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- Definition Tabular disclosure of activity in the balance of servicing assets subsequently measured at amortized cost. Includes, but is not limited to, beginning and ending balances, additions, disposals, and amortization. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122739-111746 + Details
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- References No definition available. + Details
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