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Mortgage Servicing Rights (Tables)
 9 Months Ended
Sep. 30, 2017
Transfers and Servicing [Abstract]  
Changes in the Company's MSRs
Changes in the Company’s MSRs were as follows: 
Balance at January 1, 2017
$
26,302

Capitalization
12,379

Amortization
(2,751
)
Balance at September 30, 2017
$
35,930
Data and key economic assumptions related to the Company's MSRs
Data and key economic assumptions related to the Company’s MSRs as of September 30, 2017 and December 31, 2016 are as follows:
 
 
September 30, 2017
 
December 31, 2016
Unpaid principal balance
$
3,703,064

 
$
2,763,344

 
 
 
 
Weighted-average prepayment speed (CPR)
8.89
%
 
7.34
%
Estimated impact of a 10% increase
$
(1,501
)
 
$
(1,034
)
Estimated impact of a 20% increase
(2,910
)
 
(2,010
)
 
 
 
 
Discount rate
9.68
%
 
9.64
%
Estimated impact of a 10% increase
$
(1,711
)
 
$
(1,368
)
Estimated impact of a 20% increase
(3,292
)
 
(2,629
)
 
 
 
 
Weighted-average coupon interest rate
3.89
%
 
3.83
%
Weighted-average servicing fee (basis points)
26.22

 
25.87

Weighted-average remaining maturity (in years)
14.94

 
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