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Premises and Equipment, Net (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Land [Member]
Dec. 31, 2011
Land [Member]
Dec. 31, 2012
Building [Member]
Dec. 31, 2011
Building [Member]
Dec. 31, 2012
Building [Member]
Maximum [Member]
Dec. 31, 2012
Building [Member]
Minimum [Member]
Dec. 31, 2012
Furniture, Fixtures and Equipment [Member]
Dec. 31, 2011
Furniture, Fixtures and Equipment [Member]
Dec. 31, 2012
Furniture, Fixtures and Equipment [Member]
Maximum [Member]
Dec. 31, 2012
Furniture, Fixtures and Equipment [Member]
Minimum [Member]
Summary of premises and equipment by classification                        
Estimated Useful Lives             40 years 10 years     15 years 3 years
Premises and equipment, gross     $ 28,488 $ 27,738 $ 116,045 $ 112,614     $ 60,174 $ 58,340    
Accumulated depreciation (89,204) (87,337)                    
Premises and equipment, net $ 115,503 $ 111,355