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Summary of Significant Accounting Policies - Premises and Equipment (Details)
12 Months Ended
Dec. 31, 2012
Buildings and improvements | Minimum
 
Property, Plant and Equipment  
Estimated useful lives 5 years
Buildings and improvements | Maximum
 
Property, Plant and Equipment  
Estimated useful lives 45 years
Furniture and equipment | Minimum
 
Property, Plant and Equipment  
Estimated useful lives 4 years
Furniture and equipment | Maximum
 
Property, Plant and Equipment  
Estimated useful lives 15 years