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Mortgage Servicing Rights (Tables) | 12 Months Ended
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Dec. 31, 2017
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, | 2017 |  | 2016 |  | 2015
Balance at beginning of year | $ | 18.7 |  |  | $ | 15.9 |  |  | $ | 14.4 |
Acquisitions of mortgage servicing rights | 3.5 |  |  | — |  |  | 0.3 |
Originations of mortgage servicing rights | 5.6 |  |  | 5.8 |  |  | 3.6 |
Amortization expense | (3.0 | ) |  | (3.0 | ) |  | (2.4 | )
Balance at end of year | 24.8 |  |  | 18.7 |  |  | 15.9 |
Less valuation reserve | — |  |  | (0.2 | ) |  | (0.2 | )
Balance at end of year, net of valuation reserve | $ | 24.8 |  |  | $ | 18.5 |  |  | $ | 15.7 |
Principal balance of serviced loans underlying mortgage servicing rights | $ | 3,636.7 |  |  | $ | 3,127.5 |  |  | $ | 2,906.2 |
Mortgage servicing rights as a percentage of serviced loans | 0.68 | % |  | 0.59 | % |  | 0.54 | %

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 + Details
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- References No definition available. + Details
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