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Mortgage Servicing Rights (Tables)
 3 Months Ended
Mar. 31, 2016
Transfers and Servicing [Abstract]  
Changes in the Company's mortgage servicing rights
Changes in the Company’s mortgage servicing rights were as follows:
 
Balance at January 1, 2016
$
29,642

Sale of MSRs
(18,477
)
Capitalization
2,869

Amortization
(668
)
 
 
Balance at March 31, 2016
$
13,366
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 March 31, 2016 are as follows:
 
Unpaid principal balance
$
1,433,010

 
 
Weighted-average prepayment speed (CPR)
11.01
%
Estimated impact of a 10% increase
$
(591
)
Estimated impact of a 20% increase
(1,138
)
 
 
Discount rate
9.53
%
Estimated impact of a 10% increase
$
(505
)
Estimated impact of a 20% increase
(975
)
 
 
Weighted-average coupon interest rate
4.04
%
Weighted-average servicing fee (basis points)
25.16

Weighted-average remaining maturity (in years)
10.09