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Mortgage Servicing Rights
12 Months Ended
Dec. 31, 2016
Transfers and Servicing [Abstract]  
Mortgage Servicing Rights
Mortgage Servicing Rights
The following table details the activity in the Company's mortgage servicing rights ("MSR") for the year indicated:
(In thousands)
2016
2015
 
 
 
Balance, beginning of period

$1,654


$1,010

Additions for new MSR capitalized
3,029

802

Changes in fair value:
 
 
  Due to changes in model inputs of assumptions (1)
(214
)
29

  Other (2)
(312
)
(187
)
Carrying value, December 31

$4,157


$1,654



(1) Principally reflects changes in discount rates and prepayment speed assumptions, which are primarily affected by changes in interest rates.
(2) Represents changes due to collection/realization of expected cash flows over time.

The following table details information related to our serviced mortgage loan portfolio as of December 31, 2016 and 2015:

(In thousands)
December 31, 2016
December 31, 2015
 
 
 
Balance of loans serviced for others

$272,442


$125,446

MSR as a percentage of serviced loans
1.53
%
1.32
%


The Company recognized servicing fees of $675,000, $261,000 and $203,000 during 2016, 2015 and 2014, respectively, as a component of other noninterest income in the Company's Consolidated Statements of Income.

The following table outlines the key assumptions used in measuring the fair value of mortgage servicing rights as of December 31, 2016 and 2015:

 
2016
2015
 
 
 
Constant prepayment rate
11.58
%
10.54
%
Discount rate
9.25
%
9.10
%


At December 31, 2016 and 2015, the Company serviced $456.4 million and $263.0 million of commercial and mortgage loans, respectively, which had been sold to various investors without recourse. At December 31, 2016 and 2015, the Company held $2.7 million and $1.4 million, respectively, in trust for these loans for the payment of such items as taxes, insurance, and maintenance costs.