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Mortgage Servicing Rights
12 Months Ended
Dec. 31, 2016
Transfers and Servicing [Abstract]  
Mortgage Servicing Rights
NOTE 7 – MORTGAGE SERVICING RIGHTS
The following table summarizes the changes in MSRs, which are included in other assets on the consolidated balance sheets:
 
2016
 
2015
 
(in thousands)
Amortized cost:
 
 
 
Balance at beginning of year
$
40,944

 
$
42,148

Originations of mortgage servicing rights
5,485

 
6,166

Amortization expense
(7,607
)
 
(7,370
)
Balance at end of year
$
38,822

 
$
40,944

 
 
 
 
Valuation allowance:
 
 
 
Balance at beginning of year
$

 
$

Net additions to the valuation allowance
(1,291
)
 

Balance at end of year
$
(1,291
)
 
$

 
 
 
 
Net MSRs at end of year
$
37,531

 
$
40,944



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 estimated prepayments. Based on a fair value analysis, the Corporation determined that net additions of $1.3 million to the valuation allowance were appropriate during 2016. No valuation allowance was determined to be necessary as of December 31, 2015.

The estimated fair value of MSRs was $38.2 million and $45.3 million as of December 31, 2016 and 2015, respectively.
Total MSR amortization expense, recognized as a reduction to mortgage banking income in the consolidated statements of income, was $7.6 million and $7.4 million in 2016 and 2015, respectively. Estimated MSR amortization expense for the next five years, based on balances as of December 31, 2016 and the estimated remaining lives of the underlying loans, follows (in thousands):
Year
 
2017
$
6,538

2018
6,087

2019
5,590

2020
5,043

2021
4,443