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Mortgage Servicing Rights
 12 Months Ended
Dec. 31, 2018
Transfers and Servicing [Abstract]  
Mortgage Servicing Rights
Mortgage Servicing Rights
(In Thousands)
Changes in the Company’s mortgage servicing rights (“MSRs”) were as follows, for the periods presented:
Carrying Value at January 1, 2017
$
26,302

Capitalization
16,973

Amortization
(3,936
)
Carrying Value at December 31, 2017
$
39,339

Capitalization
13,905

Amortization
(5,014
)
Carrying Value at December 31, 2018
$
48,230


During 2016, the Company recognized an impairment loss on MSRs in earnings in the amount of $40, which was included in “Mortgage banking income” in the Consolidated Statements of Income. There were no impairment losses recognized during 2018 or 2017.
Data and key economic assumptions related to the Company’s mortgage servicing rights as of December 31 are as follows: 
 
2018
 
2017
 
2016
Unpaid principal balance
$
4,635,712

 
$
4,012,519

 
$
2,763,344

Weighted-average prepayment speed (CPR)
7.95
%
 
8.04
%
 
7.34
%
Estimated impact of a 10% increase
$
(1,264
)
 
$
(1,592
)
 
$
(1,034
)
Estimated impact of a 20% increase
(2,569
)
 
(3,095
)
 
(2,010
)
 
 
 
 
 
 
Discount rate
9.45
%
 
9.69
%
 
9.64
%
Estimated impact of a 100bp increase
$
(2,657
)
 
$
(2,027
)
 
$
(1,368
)
Estimated impact of a 200bp increase
(5,103
)
 
(3,896
)
 
(2,629
)
 
 
 
 
 
 
Weighted-average coupon interest rate
4.04
%
 
3.89
%
 
3.83
%
Weighted-average servicing fee (basis points)
27.47

 
26.36

 
25.87

Weighted-average remaining maturity (in years)
8.03

 
7.98

 
11.11


The Company recorded servicing fees of $8,876, $5,735 and $3,212, respectively, for the twelve months ended December 31, 2018, 2017 and 2016, respectively. These fees are included under the line item “Mortgage banking income” in the Consolidated Statements of Income.