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Mortgage Servicing Rights (Tables)
 6 Months Ended
Jun. 30, 2015
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, 2015
$
11,662

Capitalization
2,360

Amortization
(1,102
)
 
 
Balance at June 30, 2015
$
12,920
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 June 30, 2015 are as follows:
 
Unpaid principal balance
$
1,321,200

 
 
Weighted-average prepayment speed (CPR)
5.28
%
Estimated impact of a 10% increase
$
(1,046
)
Estimated impact of a 20% increase
(1,454
)
 
 
Discount rate
10.76
%
Estimated impact of a 10% increase
$
(1,088
)
Estimated impact of a 20% increase
(15,529
)
 
 
Weighted-average coupon interest rate
3.83
%
Weighted-average servicing fee (basis points)
25.03

Weighted-average remaining maturity (in years)
24.3