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Mortgage Servicing Rights (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015
$
11,662

Additions through acquisition
10,429

Capitalization
10,793

Amortization
(3,242
)
Carrying value at December 31, 2015
$
29,642
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, 2015 are as follows: 
Unpaid principal balance
$
3,090,839

Weighted-average prepayment speed (CPR)
8.89
%
Estimated impact of a 10% increase
$
(1,203
)
Estimated impact of a 20% increase
(2,330
)
 
 
Discount rate
9.51
%
Estimated impact of a 100bp increase
$
(1,357
)
Estimated impact of a 200bp increase
(2,612
)
 
 
Weighted-average coupon interest rate
3.97
%
Weighted-average servicing fee (basis points)
25.04

Weighted-average remaining maturity (in years)
15.23