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Mortgage Servicing Rights
 12 Months Ended
Dec. 31, 2019
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,
2019
 
2018
 
2017
Balance at beginning of year
$
27.7

 
$
24.8

 
$
18.7

Acquisitions of mortgage servicing rights
—

 
—

 
3.5

Originations of mortgage servicing rights
7.3

 
6.0

 
5.6

Amortization expense
(4.4
)
 
(3.1
)
 
(3.0
)
Balance at end of year
30.6

 
27.7

 
24.8

Less valuation reserve
(0.4
)
 
—

 
—

Balance at end of year, net of valuation reserve
$
30.2

 
$
27.7

 
$
24.8

 
 
 
 
 
 
Principal balance of serviced loans underlying mortgage servicing rights
$
3,710.1

 
$
3,698.2

 
$
3,636.7

Mortgage servicing rights as a percentage of serviced loans
0.81
%
 
0.75
%
 
0.68
%

            
At December 31, 2019, the estimated fair value and weighted average remaining life of the Company’s mortgage servicing rights were $34.8 million and 6.0 years, respectively. The fair value of mortgage servicing rights was determined using discount rates ranging from 9.3% to 11.0% and monthly prepayment speeds ranging from 0.6% to 1.5% depending upon the risk characteristics of the underlying loans. At December 31, 2018, the estimated fair value and weighted average remaining life of the Company’s mortgage servicing rights were $42.4 million and 8.0 years, respectively. The fair value of mortgage servicing rights was determined using discount rates ranging from 10.4% to 12.1% and monthly prepayment speeds ranging from 0.4% to 1.5% depending upon the risk characteristics of the underlying loans. There were no material impairments reversed in 2019, 2018 and 2017, respectively. No permanent impairment was recorded in 2019, 2018, or 2017.