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Loan Servicing (Tables)
 12 Months Ended
Dec. 31, 2014
Transfers and Servicing of Financial Assets [Abstract]  
Schedule of servicing assets at amortized value
Activity for mortgage servicing rights and the related valuation allowance follows:
 
December 31 (In thousands)
 
2014
 
2013
 
2012
Mortgage servicing rights:
 
 
 
 
 
 
Carrying amount, net, beginning of year
 
$
9,013

 
$
7,763

 
$
9,301

Additions
 
1,026

 
2,436

 
3,399

Amortization
 
(1,631
)
 
(2,479
)
 
(3,634
)
Change in valuation allowance
 
205

 
1,293

 
(1,303
)
Carrying amount, net, end of year
 
$
8,613

 
$
9,013

 
$
7,763

Valuation allowance:
 
 
 
 
 
 
Beginning of year
 
$
1,031

 
$
2,324

 
$
1,021

Change in valuation allowance
 
(205
)
 
(1,293
)
 
1,303

End of year
 
$
826

 
$
1,031

 
$
2,324