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Off-balance sheet financial instruments (Tables)
12 Months Ended
Dec. 31, 2014
Guarantees [Abstract]  
Summary of Contractual Amounts of Off-balance Sheet Commitments

The contractual amounts of off-balance sheet commitments at December 31, 2014 and 2013 are summarized as follows:

 

December 31

   2014      2013  

Commitments to extend credit

   $ 187,351       $ 221,138   

Unused portions of lines of credit

     48,610         52,257   

Standby letters of credit

     30,609         29,914   
  

 

 

    

 

 

 
$ 266,570    $ 303,309