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Mortgage Servicing Rights
 12 Months Ended
Dec. 31, 2021
Transfers and Servicing [Abstract]  
Mortgage Servicing Rights MORTGAGE SERVICING RIGHTS
Information with respect to the Company’s mortgage servicing rights follows:
Year Ended December 31,202120202019
Balance at beginning of year$34.3 $30.6 $27.7 
Originations of mortgage servicing rights3.7 11.7 7.3 
Amortization expense(6.4)(8.0)(4.4)
Balance at end of year31.6 34.3 30.6 
Less valuation reserve(3.4)(10.3)(0.4)
Balance at end of year, net of valuation reserve$28.2 $24.0 $30.2 
Principal balance of serviced loans underlying mortgage servicing rights
$3,203.7 $3,585.5 $3,710.1 
Mortgage servicing rights as a percentage of serviced loans0.88 %0.67 %0.81 %
At December 31, 2021, the estimated fair value and weighted average remaining life of the Company’s mortgage servicing rights were $28.2 million and 5.9 years, respectively. The fair value of mortgage servicing rights was determined using discount rates ranging from 8.6% to 10.4% and monthly prepayment speeds ranging from 0.7% to 2.0% depending upon the risk characteristics of the underlying loans. At December 31, 2020, the estimated fair value and weighted average remaining life of the Company’s mortgage servicing rights were $24.0 million and 3.9 years, respectively. The fair value of mortgage servicing rights was determined using discount rates ranging from 8.3% to 10.0% and monthly prepayment speeds ranging from 1.2% to 2.5% depending upon the risk characteristics of the underlying loans. There were $6.9 million of impairments reversed in 2021, compared to a valuation impairment charge of $9.9 million and $0.4 million in 2020 and 2019, respectively. No permanent impairment was recorded in 2021, 2020, or 2019.