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Mortgage Servicing Rights (Tables)
 6 Months Ended
Jun. 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
6,303

Amortization
(2,403
)
Balance at June 30, 2018
$
43,239
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:
 
 
June 30, 2018
 
December 31, 2017
Unpaid principal balance
$
4,315,261

 
$
4,012,519

 
 
 
 
Weighted-average prepayment speed (CPR)
7.32
%
 
8.04
%
Estimated impact of a 10% increase
$
(1,792
)
 
$
(1,592
)
Estimated impact of a 20% increase
(3,475
)
 
(3,095
)
 
 
 
 
Discount rate
9.42
%
 
9.69
%
Estimated impact of a 10% increase
$
(2,573
)
 
$
(2,027
)
Estimated impact of a 20% increase
(4,937
)
 
(3,896
)
 
 
 
 
Weighted-average coupon interest rate
3.94
%
 
3.89
%
Weighted-average servicing fee (basis points)
26.77

 
26.36

Weighted-average remaining maturity (in years)
8.35
 
7.98