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Premises and Equipment - Year-End Premises and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 43,247 $ 41,430
Accumulated depreciation (25,636) (23,510)
Premises and equipment, net 17,611 17,920
Land and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 5,022 5,094
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 21,221 20,266
Furniture and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 17,004 $ 16,070