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Premises and Equipment - Major Categories of Banking Premises and Equipment and Accumulated Depreciation (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) $ 43,220 $ 41,846
Less: Accumulated depreciation (21,603) (20,389)
Premises and Equipment (Net) 21,617 21,457
Land [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) 5,892 5,647
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) 23,977 23,526
Furnishings [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) $ 13,351 $ 12,673