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Mortgage Servicing Rights (Tables)
 3 Months Ended
Mar. 31, 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
2,098

Amortization
(1,221
)
Balance at March 31, 2018
$
40,216
Data and key economic assumptions related to the Company's MSRs
Data and key economic assumptions related to the Company’s MSRs as of March 31, 2018 and December 31, 2017 are as follows:
 
 
March 31, 2018
 
December 31, 2017
Unpaid principal balance
$
4,089,045

 
$
4,012,519

 
 
 
 
Weighted-average prepayment speed (CPR)
7.42
%
 
8.04
%
Estimated impact of a 10% increase
$
(1,692
)
 
$
(1,592
)
Estimated impact of a 20% increase
(3,280
)
 
(3,095
)
 
 
 
 
Discount rate
9.40
%
 
9.69
%
Estimated impact of a 10% increase
$
(2,374
)
 
$
(2,027
)
Estimated impact of a 20% increase
(4,556
)
 
(3,896
)
 
 
 
 
Weighted-average coupon interest rate
3.89
%
 
3.89
%
Weighted-average servicing fee (basis points)
26.54

 
26.36

Weighted-average remaining maturity (in years)
8.27

 
7.98