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Mortgage Servicing Rights
 12 Months Ended
Dec. 31, 2017
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,
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
%

            
At December 31, 2017, the estimated fair value and weighted average remaining life of the Company’s mortgage servicing rights were $40.1 million and 7.3 years, respectively. The fair value of mortgage servicing rights was determined using discount rates ranging from 9.5% to 11.3% and monthly prepayment speeds ranging from 0.5% to 1.8% depending upon the risk characteristics of the underlying loans. At December 31, 2016, the estimated fair value and weighted average remaining life of the Company’s mortgage servicing rights were $35.7 million and 8.0 years, respectively. The fair value of mortgage servicing rights was determined using discount rates ranging from 9.6% to 11.4% and monthly prepayment speeds ranging from 0.5% to 1.5% depending upon the risk characteristics of the underlying loans. The Company reversed impairment of $0.09 million, $0.04 million and $0.10 million in 2017, 2016 and 2015, respectively. No permanent impairment was recorded in 2017, 2016 or 2015.