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Goodwill and Other Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Identified intangible assets      
Carrying Amount $ 60,697 $ 60,417  
Accumulated Amortization 52,878 48,227  
Total identified intangibles, Net 7,819 12,190  
Amortization expense 4,651 5,293 5,284
Estimated amortization expense for each of the five succeeding fiscal years and thereafter      
2013 4,633    
2014 2,389    
2015 452    
2016 295    
2017 25    
Thereafter 25    
Total 7,819    
Core deposit premium
      
Identified intangible assets      
Carrying Amount 58,675 58,675  
Accumulated Amortization 51,974 47,632  
Total identified intangibles, Net 6,701 11,043  
Identified intangible (contract rights)
      
Identified intangible assets      
Carrying Amount 2,022 1,742  
Accumulated Amortization 904 595  
Total identified intangibles, Net $ 1,118 $ 1,147