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Mortgage Servicing Rights (Tables)
 12 Months Ended
Dec. 31, 2019
Transfers and Servicing [Abstract]  
Changes in the Company's mortgage servicing rights
Changes in the Company’s mortgage servicing rights (“MSRs”) were as follows, for the periods presented:
Carrying Value at January 1, 2018
$
39,339

Capitalization
13,905

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

Capitalization
13,823

Amortization
(7,009
)
Valuation adjustment
(1,836
)
Carrying Value at December 31, 2019
$
53,208
Data and key economic assumptions related to the Company's mortgage servicing rights
Data and key economic assumptions related to the Company’s mortgage servicing rights as of December 31 are as follows: 
 
2019
 
2018
 
2017
Unpaid principal balance
$
4,871,155

 
$
4,635,712

 
$
4,012,519

Weighted-average prepayment speed (CPR)
11.48
%
 
7.95
%
 
8.04
%
Estimated impact of a 10% increase
$
(2,469
)
 
$
(1,264
)
 
$
(1,592
)
Estimated impact of a 20% increase
(4,774
)
 
(2,569
)
 
(3,095
)
 
 
 
 
 
 
Discount rate
9.69
%
 
9.45
%
 
9.69
%
Estimated impact of a 100bp increase
$
(2,027
)
 
$
(2,657
)
 
$
(2,027
)
Estimated impact of a 200bp increase
(3,908
)
 
(5,103
)
 
(3,896
)
 
 
 
 
 
 
Weighted-average coupon interest rate
4.04
%
 
4.04
%
 
3.89
%
Weighted-average servicing fee (basis points)
29.20

 
27.47

 
26.36

Weighted-average remaining maturity (in years)
6.35

 
8.03

 
7.98