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Premises and Equipment - Major Categories of Banking Premises and Equipment and Accumulated Depreciation (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) $ 41,846 $ 39,702
Less: Accumulated depreciation (20,389) (19,115)
Premises and Equipment (Net) 21,457 20,587
Land [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) 5,647 5,647
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) 23,526 21,943
Furnishings [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) $ 12,673 11,783
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross)   $ 329