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Premises and Equipment (Tables)
12 Months Ended
Dec. 31, 2012
Property, Plant and Equipment [Abstract]  
Summary of Premises and Equipment
    2012 2011
  Estimated  AccumulatedNet Book Net Book
  Useful Lives  Cost Depreciation Value  Value
      ($ in Thousands)    
Land $ 46,378$ -$ 46,378 $ 44,581
Land improvements3 – 15 years   9,973  3,561  6,412   6,309
Buildings5 – 39 years   234,486  112,990  121,496   100,246
Computers3 – 5 years   43,482  32,054  11,428   11,991
Furniture, fixtures and other equipment3 – 15 years   157,375  99,708  57,667   50,892
Leasehold improvements5 – 30 years   31,639  21,062  10,577   9,717
 Total premises and equipment  $ 523,333$ 269,375$ 253,958 $ 223,736
Minimum annual rentals and commitments under noncancelable operating leases
 ($ in Thousands)
2013$12,192
2014 11,198
2015 11,041
2016 11,068
2017 9,615
Thereafter 42,441
Total$97,555