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Mortgage Servicing Rights
3 Months Ended
Mar. 31, 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 March 31
 
 
2016
 
2015
 
 
(in thousands)
Amortized cost:
 
 
 
 
Balance at beginning of period
$
40,944

 
$
42,148

 
Originations of mortgage servicing rights
920

 
1,557

 
Amortization
(1,669
)
 
(1,902
)
 
Balance at end of period
$
40,195

 
$
41,803

 


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. No valuation allowance was necessary as of March 31, 2016 or 2015.

As of March 31, 2016, the estimated fair value of MSRs was $40.8 million, which exceeded their book value.