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Mortgage Servicing Rights
 12 Months Ended
Dec. 31, 2023
Transfers and Servicing [Abstract]  
Mortgage Servicing Rights MORTGAGE SERVICING RIGHTS
Information with respect to the Company’s mortgage servicing rights follows:
Year Ended December 31,202320222021
Balance at beginning of year$31.1 $31.6 $34.3 
Acquisition of mortgage servicing rights— 1.3 — 
Originations of mortgage servicing rights1.1 2.5 3.7 
Amortization expense(3.9)(4.3)(6.4)
Balance at end of year28.3 31.1 31.6 
Less valuation reserve— — (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 loans0.92 %0.95 %0.88 %
At December 31, 2023, the estimated fair value and weighted average remaining life of the Company’s mortgage servicing rights were $38.8 million and 7.8 years, respectively. The fair value of mortgage servicing rights was determined using discount rates ranging from 11.9% to 12.8% and monthly prepayment speeds ranging from 0.4% to 1.6% depending upon the risk characteristics of the underlying loans. At December 31, 2022, the estimated fair value and weighted average remaining life of the Company’s mortgage servicing rights were $37.4 million and 7.6 years, respectively. The fair value of mortgage servicing rights was determined using discount rates ranging from 11.8% to 13.5% and monthly prepayment speeds ranging from 0.5% to 3.4% depending upon the risk characteristics of the underlying loans. There were no temporary impairments or impairment reversals in 2023, compared to $3.4 million and $6.9 million of impairments reversed in 2022 and 2021, respectfully. No permanent impairment was recorded in 2023, 2022, or 2021.