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Premises and Equipment - Schedule of Premises and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 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
Land [Member]
Minimum [Member]
Dec. 31, 2012
Land [Member]
Maximum [Member]
Dec. 31, 2012
Buildings and improvements [Member]
Dec. 31, 2011
Buildings and improvements [Member]
Dec. 31, 2012
Buildings and improvements [Member]
Minimum [Member]
Dec. 31, 2012
Buildings and improvements [Member]
Maximum [Member]
Dec. 31, 2012
Leasehold improvements [Member]
Dec. 31, 2011
Leasehold improvements [Member]
Dec. 31, 2012
Leasehold improvements [Member]
Minimum [Member]
Dec. 31, 2012
Leasehold improvements [Member]
Maximum [Member]
Dec. 31, 2012
Furniture and equipment [Member]
Dec. 31, 2011
Furniture and equipment [Member]
Dec. 31, 2012
Furniture and equipment [Member]
Minimum [Member]
Dec. 31, 2012
Furniture and equipment [Member]
Maximum [Member]
Dec. 31, 2012
Software [Member]
Dec. 31, 2011
Software [Member]
Dec. 31, 2012
Software [Member]
Minimum [Member]
Dec. 31, 2012
Software [Member]
Maximum [Member]
Property, Plant and Equipment [Line Items]                                            
Estimated Useful Life         Indefinite Indefinite                                
Estimated Useful Life                 10 years 50 years     5 years 40 years     3 years 10 years     3 years 10 years
Property plant and equipment, gross $ 227,828 $ 221,322 $ 12,503 $ 12,513     $ 81,328 $ 81,072     $ 14,617 $ 14,536     $ 79,181 $ 79,722     $ 40,199 $ 33,479    
Less accumulated depreciation and amortization 158,858 154,567                                        
Total premises and equipment $ 68,970 $ 66,755