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Bank Premises and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Bank buildings and improvements
Dec. 31, 2011
Bank buildings and improvements
Dec. 31, 2012
Bank buildings and improvements
Minimum
Dec. 31, 2012
Bank buildings and improvements
Maximum
Dec. 31, 2012
Furniture, equipment and vehicles
Dec. 31, 2011
Furniture, equipment and vehicles
Dec. 31, 2012
Furniture, equipment and vehicles
Minimum
Dec. 31, 2012
Furniture, equipment and vehicles
Maximum
Dec. 31, 2012
Land
Dec. 31, 2011
Land
Dec. 31, 2012
Land, building, furniture, fixture and equipment
Dec. 31, 2011
Land, building, furniture, fixture and equipment
Dec. 31, 2012
Land, building, furniture, fixture and equipment
Minimum
Dec. 31, 2012
Land, building, furniture, fixture and equipment
Maximum
Bank premises and equipment                                
Bank premises and equipment, gross     $ 433,942 $ 390,875     $ 258,222 $ 266,547     $ 128,695 $ 124,694 $ 562 $ 614    
Less: accumulated depreciation (340,134) (329,680)                            
Bank premises and equipment, net $ 481,287 $ 453,050                            
Estimated useful lives         5 years 40 years     1 year 20 years         7 years 27 years