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Mortgage Servicing Rights and Mortgage Servicing Activity (Tables)
 9 Months Ended
Sep. 30, 2015
Transfers and Servicing [Abstract]  
Changes in the carrying amount of mortgage servicing rights
Changes in the carrying amount of MSRs and MSRs valuation allowance are as follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(In thousands)
2015
 
2014
 
2015
 
2014
Carrying amount of MSRs
 
 
 
 
 
 
 
Beginning balance
$
20,635

 
$
22,150

 
$
22,011

 
$
22,760

Additions
53

 
1,035

 
586

 
2,242

Amortization
(921
)
 
(996
)
 
(2,830
)
 
(2,813
)
Ending balance
19,767

 
22,189

 
19,767

 
22,189

 
 
 
 
 
 
 
 
Valuation Allowance:
 
 
 
 
 
 
 
Beginning balance
(490
)
 
(562
)
 
(955
)
 
(282
)
Recoveries/(Additions)
(60
)
 
57

 
405

 
(223
)
Ending balance
(550
)
 
(505
)
 
(550
)
 
(505
)
MSRs, net carrying balance
$
19,217

 
$
21,684

 
$
19,217

 
$
21,684

 
 
 
 
 
 
 
 
Fair value at end of period
$
19,556

 
$
22,229

 
$
19,556

 
$
22,229

 
 
 
 
 
 
 
 
Changes in Key economics assumptions
In reality, changes in one factor may result in changes in another (for example, changes in prepayment speed estimates could result in changes in the discount rates), which might magnify or counteract the sensitivities.

(Dollars in thousands)
Prepayment speed assumption (annual CPR)
11.15
%
    Decrease in fair value from 10% adverse change
$
1,093

    Decrease in fair value from 25% adverse change
$
1,345

Discount rate assumption
9.39
%
    Decrease in fair value from 100 basis point adverse change
$
604

    Decrease in fair value from 200 basis point adverse change
$
1,169

Expected weighted-average life (in months)
96