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Goodwill and Other Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Identified intangible assets      
Carrying Amount $ 60,417 $ 60,243  
Accumulated Amortization 48,227 42,934  
Total identified intangibles, Net 12,190 17,309  
Amortization expense 5,293 5,284 5,286
Estimated amortization expense for each of the five succeeding fiscal years and thereafter      
2012 4,630    
2013 4,611    
2014 2,368    
2015 429    
2016 128    
Thereafter 24    
Total 12,190    
Core deposit premium
      
Identified intangible assets      
Carrying Amount 58,675 58,675  
Accumulated Amortization 47,632 42,583  
Total identified intangibles, Net 11,043 16,092  
Identified intangible (contract rights)
      
Identified intangible assets      
Carrying Amount 1,742 1,568  
Accumulated Amortization 595 351  
Total identified intangibles, Net $ 1,147 $ 1,217