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Mortgage Banking (Tables)
3 Months Ended
Mar. 31, 2013
Mortgage Banking [Abstract]  
Schedule of activity in Mortgage Servicing Rights
The activity in MSR is detailed in the table below ($ in thousands):
 
   
Three Months Ended March 31,
 
   
2013
  
2012
 
Balance at beginning of period
 $47,341  $43,274 
Origination of servicing assets
  5,521   4,477 
Change in fair value:
        
Due to market changes
  1,127   248 
Due to runoff
  (2,460)  (2,106)
Balance at end of period
 $51,529  $45,893