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Summary of Significant Accounting Policies (Details 3) (USD $)
12 Months Ended
Dec. 31, 2012
item
Dec. 31, 2011
Core Deposit Intangible Assets    
Carrying value of the intangible asset $ 3,276,000 $ 4,678,000
Segment Reporting    
Number of operating segments 1  
Core Deposit Intangible
   
Core Deposit Intangible Assets    
Estimated useful life 12 years  
Amount of increase in amortization expenses 622,000  
Carrying value of the intangible asset 3,300,000 4,700,000
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2013 2,100,000  
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2014 $ 1,200,000  
Buildings | Minimum
   
Premises and equipment    
Useful lives 25 years  
Buildings | Maximum
   
Premises and equipment    
Useful lives 40 years  
Building improvements | Minimum
   
Premises and equipment    
Useful lives 3 years  
Building improvements | Maximum
   
Premises and equipment    
Useful lives 15 years  
Furniture and equipment | Minimum
   
Premises and equipment    
Useful lives 3 years  
Furniture and equipment | Maximum
   
Premises and equipment    
Useful lives 10 years