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Mortgage Servicing Rights (Tables)
 12 Months Ended
Dec. 31, 2017
Transfers and Servicing [Abstract]  
Changes in the Company's mortgage servicing rights
Changes in the Company’s mortgage servicing rights (“MSRs”) were as follows, for the periods presented:
Carrying Value at January 1, 2016
$
29,642

Sale of MSRs
(18,477
)
Capitalization
18,061

Amortization
(2,884
)
Impairment
(40
)
Carrying Value at December 31, 2016
$
26,302

Capitalization
16,973

Amortization
(3,936
)
Carrying Value at December 31, 2017
$
39,339
Data and key economic assumptions related to the Company's mortgage servicing rights
Data and key economic assumptions related to the Company’s mortgage servicing rights as of December 31 are as follows: 
 
2017
 
2016
 
2015
Unpaid principal balance
$
4,012,519

 
$
2,763,344

 
$
3,090,839

Weighted-average prepayment speed (CPR)
8.04
%
 
7.34
%
 
8.89
%
Estimated impact of a 10% increase
$
(1,592
)
 
$
(1,034
)
 
$
(1,203
)
Estimated impact of a 20% increase
(3,095
)
 
(2,010
)
 
(2,330
)
 
 
 
 
 
 
Discount rate
9.69
%
 
9.64
%
 
9.51
%
Estimated impact of a 100bp increase
$
(2,027
)
 
$
(1,368
)
 
$
(1,357
)
Estimated impact of a 200bp increase
(3,896
)
 
(2,629
)
 
(2,612
)
 
 
 
 
 
 
Weighted-average coupon interest rate
3.89
%
 
3.83
%
 
3.97
%
Weighted-average servicing fee (basis points)
26.36

 
25.87

 
25.04

Weighted-average remaining maturity (in years)
7.98

 
11.11

 
15.23