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Mortgage Servicing Rights and Mortgage Servicing Activity (Tables)
 3 Months Ended
Mar. 31, 2016
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 March 31,
(In thousands)
2016
 
2015
Carrying amount of MSRs
 
 
 
Beginning balance
$
18,938

 
$
22,011

Additions
28

 
470

Amortization
(839
)
 
(991
)
Ending balance
18,127

 
21,490

 
 
 
 
Valuation Allowance:
 
 
 
Beginning balance
(399
)
 
(955
)
Recoveries/(Additions)
(469
)
 
(176
)
Ending balance
(868
)
 
(1,131
)
MSRs, net carrying balance
$
17,259

 
$
20,359

 
 
 
 
Fair value at end of period
$
17,460

 
$
20,526

 
 
 
 
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)
13.30
%
    Decrease in fair value from 10% adverse change
$
691

    Decrease in fair value from 25% adverse change
$
1,342

Discount rate assumption
9.39
%
    Decrease in fair value from 100 basis point adverse change
$
528

    Decrease in fair value from 200 basis point adverse change
$
1,022

Expected weighted-average life (in months)
90