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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2013
Commitments and Contingencies Disclosure [Abstract]  
Schedule of contractual amount of off-balance sheet instruments
 
Financial instruments whose contract amounts represent credit risk:   March 31, 2013      December 31, 2012     March 31, 2012  
  Commitments to extend credit        $ 565,685       $ 313,798       $ 429,672  
  Letters of credit     12,818       13,683       16,655