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Loan Servicing (Tables)
 12 Months Ended
Dec. 31, 2017
Transfers and Servicing of Financial Assets [Abstract]  
Schedule of servicing assets at amortized value
Activity for MSRs and the related valuation allowance follows:
 
December 31 (In thousands)
 
2017
 
2016
 
2015
MSRs:
 
 
 
 
 
 
Carrying amount, net, beginning of year
 
$
9,266

 
$
9,008

 
$
8,613

Additions
 
1,941

 
2,286

 
1,748

Amortization
 
(1,624
)
 
(1,835
)
 
(1,637
)
Change in valuation allowance
 
105

 
(193
)
 
284

Carrying amount, net, end of year
 
$
9,688

 
$
9,266

 
$
9,008

Valuation allowance:
 
 
 
 
 
 
Beginning of year
 
$
735

 
$
542

 
$
826

Change in valuation allowance
 
(105
)
 
193

 
(284
)
End of year
 
$
630

 
$
735

 
$
542