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Mortgage Servicing Rights
6 Months Ended
Jun. 30, 2016
Transfers and Servicing [Abstract]  
Mortgage Servicing Rights
Mortgage Servicing Rights
The following table summarizes the changes in mortgage servicing rights ("MSRs"), which are included in other assets on the consolidated balance sheets:
 
Three months ended June 30
 
Six months ended June 30
 
2016
 
2015
 
2016
 
2015
 
(in thousands)
Amortized cost:
 
 
 
 
 
 
 
Balance at beginning of period
$
40,195

 
$
41,803

 
$
40,944

 
$
42,148

Originations of mortgage servicing rights
1,508

 
1,956

 
2,428

 
3,513

Amortization
(1,829
)
 
(2,161
)
 
(3,498
)
 
(4,063
)
Balance at end of period
$
39,874

 
$
41,598

 
$
39,874

 
$
41,598

 
 
 
 
 
 
 
 
Valuation allowance:
 
 
 
 
 
 
 
Balance at beginning of period
$

 
$

 
$

 
$

Additions
(1,721
)
 

 
(1,721
)
 

Balance at end of period
$
(1,721
)
 
$

 
$
(1,721
)
 
$

 
 
 
 
 
 
 
 
Net MSRs at end of period
$
38,153

 
$
41,598

 
$
38,153

 
$
41,598



MSRs represent the economic value of existing contractual rights to service mortgage loans that have been sold. Accordingly, actual and expected prepayments of the underlying mortgage loans can impact the value of MSRs. The Corporation accounts for MSRs at the lower of amortized cost or fair value.

The fair value of MSRs is estimated by discounting the estimated cash flows from servicing income, net of expense, over the expected life of the underlying loans at a discount rate commensurate with the risk associated with these assets. Expected life is based on the contractual terms of the loans, as adjusted for prepayment projections. Based on its fair value analysis, the Corporation determined that an addition to the valuation allowance of $1.7 million was necessary as of June 30, 2016. No valuation allowance was necessary as of June 30, 2015.