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Premises and Equipment - Major Categories of Banking Premises and Equipment and Accumulated Depreciation (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) $ 35,988 $ 34,102
Less: Accumulated depreciation (17,279) (16,503)
Premises and Equipment (Net) 18,709 17,599
Land [Member]
   
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) 4,360 4,337
Buildings [Member]
   
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) 20,593 19,130
Construction in Progress [Member]
   
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross)   274
Furnishings [Member]
   
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) $ 11,035 $ 10,361