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Mortgage Servicing Rights
9 Months Ended
Sep. 30, 2019
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 September 30
 
Nine months ended September 30
 
2019
 
2018
 
2019
 
2018
 
(in thousands)
Amortized cost:
 
 
 
 
 
 
 
Balance at beginning of period
$
38,826

 
$
37,894

 
$
38,573

 
$
37,663

Originations of mortgage servicing rights
2,499

 
2,018

 
5,585

 
5,247

Amortization
(1,970
)
 
(1,684
)
 
(4,803
)
 
(4,682
)
Balance at end of period
$
39,355

 
$
38,228

 
$
39,355

 
$
38,228



MSRs represent the economic value of contractual rights to service mortgage loans that have been sold. Accordingly, actual and expected prepayments of the underlying mortgage loans can impact the corresponding fair value of the 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. The fair values of MSRs were $44.0 million and $50.2 million at September 30, 2019 and December 31, 2018, respectively.