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Premises and Equipment - Major Categories of Banking Premises and Equipment and Accumulated Depreciation (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) $ 39,702 $ 38,368
Less: Accumulated depreciation (19,115) (18,068)
Premises and Equipment (Net) 20,587 20,300
Land [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) 5,647 4,984
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) 21,943 21,955
Furnishings [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) 11,783 $ 11,429
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) $ 329