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Premises and Equipment - Summary of Premises and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 57,348 $ 47,726
Less: accumulated depreciation 25,759 23,654
Premises and equipment, net 31,589 24,072
Land [Member]
   
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 4,412 4,126
Premises and Leasehold Improvements [Member]
   
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 28,764 25,670
Furniture, Fixtures and Equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 20,248 17,522
Construction in Process [Member]
   
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 3,924 $ 408