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Premises and Equipment - Year-End Premises and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 60,061 $ 58,563
Accumulated depreciation (37,616) (35,983)
Premises and equipment, net 22,445 22,580
Land and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 6,970 6,879
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 29,305 28,835
Furniture and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 23,786 $ 22,849