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Premises and Equipment - Major Categories of Banking Premises and Equipment and Accumulated Depreciation (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) $ 60,741 $ 58,022
Less: Accumulated depreciation (33,828) (30,959)
Premises and Equipment (Net) 26,913 27,063
Land [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) 6,652 6,951
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) 30,929 30,124
Furnishings [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) $ 23,160 $ 20,947