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Mortgage Servicing Rights (Tables)
 9 Months Ended
Sep. 30, 2018
Transfers and Servicing [Abstract]  
Changes in the Company's MSRs
Changes in the Company’s MSRs were as follows: 
Balance at January 1, 2018
$
39,339

Capitalization
10,745

Amortization
(3,671
)
Balance at September 30, 2018
$
46,413
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:
 
 
September 30, 2018
 
December 31, 2017
 
September 30, 2017
Unpaid principal balance
$
4,533,400

 
$
4,012,519

 
$
3,703,064

 
 
 
 
 
 
Weighted-average prepayment speed (CPR)
7.46
%
 
8.04
%
 
8.89
%
Estimated impact of a 10% increase
$
(5,872
)
 
$
(1,592
)
 
$
(1,501
)
Estimated impact of a 20% increase
(3,732
)
 
(3,095
)
 
(2,910
)
 
 
 
 
 
 
Discount rate
9.43
%
 
9.69
%
 
9.68
%
Estimated impact of a 10% increase
$
(2,758
)
 
$
(2,027
)
 
$
(1,711
)
Estimated impact of a 20% increase
(5,291
)
 
(3,896
)
 
(3,292
)
 
 
 
 
 
 
Weighted-average coupon interest rate
4.00
%
 
3.89
%
 
3.89
%
Weighted-average servicing fee (basis points)
27.02

 
26.36

 
26.22

Weighted-average remaining maturity (in years)
8.32
 
7.98
 
14.94