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Mortgage Servicing Rights (Tables)
 3 Months Ended
Mar. 31, 2020
Transfers and Servicing [Abstract]  
Changes in the company's MSRs
Changes in the Company’s MSRs were as follows: 
Balance at January 1, 2020
$
53,208

Capitalization
4,945

Amortization
(2,217
)
Valuation adjustment
(9,571
)
Balance at March 31, 2020
$
46,365
Data and key economic assumptions related to the Company's MSRs
Data and key economic assumptions related to the Company’s MSRs are as follows as of the dates presented:
 
 
March 31, 2020
 
December 31, 2019
 
Unpaid principal balance
$
5,051,174

 
$
4,871,155

 
 
 
 
 
 
Weighted-average prepayment speed (CPR)
13.51
%
 
11.48
%
 
Estimated impact of a 10% increase
$
(1,675
)
 
$
(2,469
)
 
Estimated impact of a 20% increase
(3,234
)
 
(4,774
)
 
 
 
 
 
 
Discount rate
9.73
%
 
9.69
%
 
Estimated impact of a 10% increase
$
(2,701
)
 
$
(2,027
)
 
Estimated impact of a 20% increase
(5,203
)
 
(3,908
)
 
 
 
 
 
 
Weighted-average coupon interest rate
4.01
%
 
4.04
%
 
Weighted-average servicing fee (basis points)
29.62

 
29.20

 
Weighted-average remaining maturity (in years)
5.65
 
6.35