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Mortgage Servicing Rights (Tables)
 12 Months Ended
Dec. 31, 2014
Transfers and Servicing [Abstract]  
Changes in the Company's mortgage servicing rights
Changes in the Company’s mortgage servicing rights were as follows:
Carrying value at January 1, 2014
$
8,994

Capitalization
3,929

Amortization
(1,261
)
Carrying value at December 31, 2014
$
11,662
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, 2014 are as follows: 
Unpaid principal balance
$
1,178,390

Weighted-average prepayment speed (CPR)
8.25
%
Estimated impact of a 10% increase
$
(1,038
)
Estimated impact of a 20% increase
(1,441
)
 
 
Discount rate
10.76
%
Estimated impact of a 100bp increase
$
(1,010
)
Estimated impact of a 200bp increase
(1,378
)
 
 
Weighted-average coupon interest rate
3.84
%
Weighted-average servicing fee (basis points)
25.04

Weighted-average remaining maturity (in months)
293