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Deposits (Tables)
9 Months Ended
Sep. 30, 2012
Deposits [Abstract]  
Deposits summary
Deposits consisted of the following for the periods presented ($ in thousands):

   
September 30,
  
December 31,
 
   
2012
  
2011
 
Noninterest-bearing demand deposits
 $2,118,853  $2,033,442 
Interest-bearing demand
  1,434,454   1,463,640 
Savings
  2,338,968   2,051,701 
Time
  1,911,766   2,017,580 
Total
 $7,804,041  $7,566,363