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Mortgage Servicing Rights (Tables)
 6 Months Ended
Jun. 30, 2019
Transfers and Servicing [Abstract]  
Changes in the Company's MSRs
Changes in the Company’s MSRs were as follows: 
Balance at January 1, 2019
$
48,230

Capitalization
3,694

Amortization
(3,145
)
Balance at June 30, 2019
$
48,779
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, 2019
 
December 31, 2018
 
Unpaid principal balance
$
4,650,878

 
$
4,635,712

 
 
 
 
 
 
Weighted-average prepayment speed (CPR)
10.95
%
 
7.95
%
 
Estimated impact of a 10% increase
$
(2,111
)
 
$
(1,264
)
 
Estimated impact of a 20% increase
(4,077
)
 
(2,569
)
 
 
 
 
 
 
Discount rate
9.57
%
 
9.45
%
 
Estimated impact of a 10% increase
$
(1,935
)
 
$
(2,657
)
 
Estimated impact of a 20% increase
(3,727
)
 
(5,103
)
 
 
 
 
 
 
Weighted-average coupon interest rate
4.08
%
 
4.04
%
 
Weighted-average servicing fee (basis points)
27.87

 
27.47

 
Weighted-average remaining maturity (in years)
6.53
 
8.03