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Premises and Equipment - Major Categories of Banking Premises and Equipment and Accumulated Depreciation (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) $ 45,609 $ 43,220
Less: Accumulated depreciation (22,997) (21,603)
Premises and Equipment (Net) 22,612 21,617
Land [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) 5,917 5,892
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) 24,489 23,977
Furnishings [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) $ 15,203 $ 13,351