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Off-balance sheet financial instruments (Tables)
 12 Months Ended
Dec. 31, 2015
Guarantees [Abstract]  
Summary of Contractual Amounts of Off-balance Sheet Commitments

 

 

 

 

 

 

 

 

December 31 

    
2015

    
2014

 

Commitments to extend credit

 

$
257,011

 

$
187,351

 

Unused portions of lines of credit

 

 
52,794

 

 
48,610

 

Standby letters of credit

 

 
20,017

 

 
30,609

 

 

 

$
329,822

 

$
266,570