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Commitments and Contingent Liabilities (Tables)
12 Months Ended
Dec. 31, 2011
Commitments and Contingent Liabilities [Abstract]  
Schedule of maximum commitments potential obligation
 Collateral may be obtained based on management's assessment of the customer's creditworthiness.
 
   
At December 31,
 
(In thousands)
 
2011
  
2010
 
Unused lines of credit
 $161,551  $141,579 
Commitments to extend credits, primarily variable rate
  603,322   501,987 
Standby letters of credit
  26,783   26,193 
Commercial letters of credit
  15,218   16,255 
Loans sold with recourse
  16,175   13,970