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Mortgage Servicing Rights and Mortgage Servicing Activity (Tables)
 6 Months Ended
Jun. 30, 2014
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 June 30,
 
Six Months Ended June 30,
(In thousands)
2014
 
2013
 
2014
 
2013
Balance at beginning of period
$
22,469

 
$
21,378

 
$
22,760

 
$
21,316

Addition of Citizens' MSRs on Acquisition Date
—

 
1,065

 
—

 
1,065

Additions
643

 
1,434

 
1,207

 
2,701

Amortization
(963
)
 
(1,273
)
 
(1,817
)
 
(2,478
)
Balance at end of period
22,150

 
22,604

 
22,150

 
22,604

Valuation allowance at beginning of period
(425
)
 
(1,234
)
 
(282
)
 
(2,564
)
Recoveries (Additions)
(137
)
 
752

 
(280
)
 
2,082

Valuation allowance at end of period
(562
)
 
(482
)
 
(562
)
 
(482
)
MSRs, net carrying balance
$
21,588

 
$
22,122

 
$
21,588

 
$
22,122

Fair value at end of period
$
21,987

 
$
22,529

 
$
21,987

 
$
22,529

 
 
 
 
 
 
 
 
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.

Prepayment speed assumption (annual CPR)
10.64
%
    Decrease in fair value from 10% adverse change
$
743

    Decrease in fair value from 25% adverse change
$
1,783

Discount rate assumption
9.90
%
    Decrease in fair value from 100 basis point adverse change
$
682

    Decrease in fair value from 200 basis point adverse change
$
1,320

Expected weighted-average life (in months)
99.30