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Premises and Equipment, Net - Summary of premises and equipment by classification (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Land [Member]
Dec. 31, 2012
Land [Member]
Dec. 31, 2013
Building [Member]
Dec. 31, 2012
Building [Member]
Dec. 31, 2013
Building [Member]
Minimum [Member]
Dec. 31, 2012
Building [Member]
Maximum [Member]
Dec. 31, 2013
Furniture Fixtures And Equipment [Member]
Dec. 31, 2012
Furniture Fixtures And Equipment [Member]
Dec. 31, 2013
Furniture Fixtures And Equipment [Member]
Minimum [Member]
Dec. 31, 2012
Furniture Fixtures And Equipment [Member]
Maximum [Member]
Property, Plant and Equipment [Line Items]                        
Estimated Useful Lives             10 years 40 years     3 years 15 years
Premises and Equipment, gross     $ 29,055 $ 28,488 $ 120,784 $ 116,045     $ 61,641 $ 60,174    
Accumulated depreciation (93,618) (89,204)                    
Premises and equipment, net $ 117,862 $ 115,503