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Mortgage Servicing Rights (Tables)
 12 Months Ended
Dec. 31, 2016
Transfers and Servicing [Abstract]  
Changes in the Company's mortgage servicing rights
Changes in the Company’s mortgage servicing rights (“MSRs”) were as follows:
Carrying value at January 1, 2015
$
11,662

Additions through acquisition
10,429

Capitalization
10,793

Amortization
(3,242
)
Carrying value at December 31, 2015
$
29,642

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

Amortization
(2,884
)
Impairment
(40
)
Carrying value at December 31, 2016
$
26,302
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: 
 
2016
 
2015
 
2014
Unpaid principal balance
$
2,763,344

 
$
3,090,839

 
$
1,178,390

Weighted-average prepayment speed (CPR)
7.34
%
 
8.89
%
 
8.25
%
Estimated impact of a 10% increase
$
(1,034
)
 
$
(1,203
)
 
$
(1,038
)
Estimated impact of a 20% increase
(2,010
)
 
(2,330
)
 
(1,441
)
 
 
 
 
 
 
Discount rate
9.64
%
 
9.51
%
 
10.76
%
Estimated impact of a 100bp increase
$
(1,368
)
 
$
(1,357
)
 
$
(1,010
)
Estimated impact of a 200bp increase
(2,629
)
 
(2,612
)
 
(1,378
)
 
 
 
 
 
 
Weighted-average coupon interest rate
3.83
%
 
3.97
%
 
3.84
%
Weighted-average servicing fee (basis points)
25.87

 
25.04

 
25.04

Weighted-average remaining maturity (in years)
11.11

 
15.23

 
24.41